Review of Palaeobotany and Palynology 145 (2007) 89 – 122
www.elsevier.com/locate/revpalbo
Synchronous palynof loristic extinction and recovery after the endPermian event in the Prince Charles Mountains, Antarctica:
Implications for palynof loristic turnover across Gondwana
Sofie Lindström a,⁎, Stephen McLoughlin b
b
a
Department of Geology, Geobiosphere Science Centre, Lund University, Sölvegatan 12, SE-223 62 Lund, Sweden
School of Natural Resource Sciences, Queensland University of Technology, PO Box 2434 Brisbane, Q 4001, Australia
Received 21 December 2005; received in revised form 31 August 2006; accepted 6 September 2006
Available online 24 October 2006
Abstract
In the Prince Charles Mountains (PCMs) the conformable Permian–Triassic (P–T) succession is characterised by an abrupt
transition from coal-bearing to coal-lacking strata, which coincides with the demise of the Permian Glossopteris-dominated flora.
About 32% of the typical Permian spores and pollen are registered for the last time in the uppermost coal. Throughout the earliest
Triassic an additional 34% of the lingering Permian taxa disappear, while pioneering typical Triassic taxa appear. This interval of
contemporaneous stepwise extinction and recovery resulted in an actual increase in spore-pollen taxa diversity during the earliest
Triassic. The estimated average sedimentation rate indicates that the 24 m sampling gap that separates the last Permian assemblage
from the first Triassic one represents ca 96 000 years, and that the continued stepwise extinction and recovery lasted for ca
325 000 years. In the aftermath of the end-Permian crisis only 27% of the typical Permian spores and pollen, that were present from
the lower McKinnon Member in the Prince Charles Mountains survived to the late Induan, but by then the biodiversity had only
decreased by less than 10%. Comparisons of Gondwanan palynological and lithological data indicate that intense global warming
had already begun in the Permian, and that high latitude Gondwana areas such as the PCMs, were affected later than areas to the
north and west. They also suggest that the end-Permian crisis affected the various Gondwana regions in different ways, but that the
end result appears to have been a more equable, sub-humid to semi-arid, and less seasonal climate across southern Gondwana.
© 2006 Elsevier B.V. All rights reserved.
Keywords: Permian–Triassic transition; Antarctica; palynostratigraphy; palaeobiogeography; extinction; recovery
1. Introduction
The end-Permian extinction event is known to have
been rapid in a geological context, lasting b500 000 years
(Bowring et al., 1998) and perhaps as little as 40 000 years
(Twitchett et al., 2001), and it marked the demise of as
⁎ Corresponding author. Tel.: +46 46 2227875.
E-mail addresses: sofie.lindstrom@geol.lu.se (S. Lindström),
s.mcloughlin@qut.edu.au (S. McLoughlin).
0034-6667/$ - see front matter © 2006 Elsevier B.V. All rights reserved.
doi:10.1016/j.revpalbo.2006.09.002
much as 95% of all species on Earth (Benton and
Twitchett, 2003). The recovery of global biodiversity to
pre-extinction family levels is estimated to have taken
100 Ma (Hallam and Wignall, 1997). At the Permian–
Triassic (P–T) boundary type locality near Meishan in
China, the extinction pattern for Permian marine fossil
species is threefold: 1) a stepwise disappearance of species during some 3 Ma immediately below the boundary
with an extinction rate of 33% or less, 2) a sudden
dramatic 94% loss of species at the boundary, followed by
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3) a gradual loss of a few species that persisted into the
lowermost Triassic (Jin et al., 2000). However, following
the formal definition of the base of the Triassic by the first
appearance of the conodont element Hindeodus parvus at
the base of Bed 27c of the Meishan section in China (Jin et
al., 2000), the main phase of the marine faunal extinction
and the negative 13Ccarb excursion occurs in Bed 25, some
hundred thousand years before the Permian–Triassic
boundary. Data from an independently dated section in
East Greenland clearly demonstrate that the terrestrial
ecosystem collapse and the subsequent extinction of the
typical Late Permian Subangaran gymnosperms precedes
the P–T boundary (Looy et al., 2001; Twitchett et al.,
2001), but also show that the floristic turnover was not
instantaneous. The disappearance of the extensive peat
deposits that had characterized the northern and southern
humid climatic zones of Pangea was caused by dieback of
woody swamp-forest vegetation at the end of the Permian
(Looy et al., 1999). Land plant recovery and diversification after the end-Permian extinction event is considered
to have been relatively slow, taking about 4 Ma (Eshet et
al., 1995; Looy et al., 1999). In the Southern Hemisphere,
complex coal-forming communities did not reappear until
the Middle Triassic and were not extensively developed
until the Carnian, i.e. some 23 Ma after the end-Permian
crisis (Retallack et al., 1996; Anderson et al., 1999).
In order to resolve the ecodynamic forces that caused
the global collapse of the terrestrial ecosystem at the P–T
transition, it is important to analyze and compare palynological data from different P–T sections with respect
to the climatic and depositional conditions and the floristic diversity that characterized each area at that time. In
Gondwana, the gymnospermous glossopterids that proliferated during the Middle and Late Permian were the
most notable terrestrial casualties of the end-Permian
extinction event.
Several problems confront palaeontological analysis
of Permian–Triassic transitional sequences of Gondwana. One is that most of the P–T sections were
deposited in non-marine environments and, in the
absence of radiometric data, definition of the P–T
boundary is based solely on plant and/or tetrapod fossils.
The second problem is that in Gondwanan Permian–
Triassic transitional sequences the palynofloral turnover
is typically associated with either a palynologically
barren interval or a sampling gap straddling the P–T
boundary, thus obscuring the signal of short-term
ecological changes that took place at that time. A third
problem is that although many Gondwanan P–T
transitions have been investigated palynologically,
detailed reports on taxon appearances, extinctions and
changes in abundance are scarce. Additionally, contin-
uous P–T sections are uncommon, and in some cases it is
possible that sections are punctuated by hiatuses.
A conformable sequence of P–T sedimentary rocks
crops out in the Prince Charles Mountains, East
Antarctica. During the Late Palaeozoic to Early Mesozoic
the Prince Charles Mountains area was situated in the
centre of southeastern Gondwana, surrounded by the rest
of the Antarctic landmass, Australia, India, Madagascar
and Africa. Its central position affords the Prince Charles
Mountains special importance for correlation of P–T
successions across Gondwana. This paper describes the
palynofloral turnover across the Permian–Triassic transition in the Prince Charles Mountains, and compares it to
other gondwanan successions, in order to evaluate
geographic and temporal patterns in palynomorph
turnover within southeastern Gondwana.
2. Geological setting and lithostratigraphy
2.1. Tectonic setting
The Permian–Triassic sedimentary rocks of the
Amery Group that crop out in the northern Prince
Charles Mountains are preserved in a narrow faultbounded depression called the Lambert Graben (Fig. 1).
Exposures are constrained to the west by the Amery
Fault and by ice cover in other directions. The Lambert
Graben appears to be a half-graben as gravity studies
indicate that only the western side (i.e. the Amery Fault)
of the Lambert rift is faulted (Mishra et al., 1999). The
traditional view is that the Lambert Graben developed as
a part of a major late Palaeozoic–early Mesozoic failed
rift system (Stagg, 1985) that was continuous with the
Son-Mahanadi Graben of India prior to the breakup of
Gondwana (Fedorov et al., 1982; Stagg, 1985). In the
elongate but narrow Lambert Graben, basin fill commenced with accumulation of alluvial fan deposits constituting the Radok Conglomerate (Figs. 1 and 2). This
unit consists of conglomerates and coarse-grained sandstones, siltstones and minor coal; the sediments being
derived predominantly from the uplifted area to the west
of Amery Fault and transported easterly into the basin
(Fielding and Webb, 1995). The succeeding Bainmedart
Coal Measures incorporate repetetive fining-upward
cycles of sandstone, siltstone and coal that were deposited predominantly in northerly to northeasterly flowing high-energy braided rivers alternating with lowenergy forest mires and floodplains (Figs. 1 and 2;
Fielding and Webb, 1996; McLoughlin and Drinnan,
1997a; McLoughlin et al., 1997). The cessation of coal
deposition marks the boundary between the Bainmedart
Coal Measures and the Flagstone Bench Formation
S. Lindström, S. McLoughlin / Review of Palaeobotany and Palynology 145 (2007) 89–122
91
Fig. 1. Map of the western side of Beaver Lake, Prince Charles Mountains, Antarctica, showing the distribution of units in the Amery Group. An
enlargement of the Ritchie Point area shows the position of the Permian–Triassic boundary and the location of palynological samples with respect to
the measured sections of McLoughlin and Drinnan (1997a,b).
(McLoughlin and Drinnan, 1997a,b; McLoughlin et al.,
1997). According to McLoughlin et al. (1997), the
transition from the coal-bearing Bainmedart Coal
Measures to the coal-lacking Flagstone Bench Formation marks the transition between the Permian and
Triassic (Figs. 1 and 2). The lower part of the Flagstone
Bench Formation, represented by the Ritchie Member,
comprises sandstones and siltstones that were deposited
with persisting cyclicity (albeit lacking coal) by
predominantly northerly directed rivers under the influ-
ence of increasing aridity (McLoughlin and Drinnan,
1997b; McLoughlin et al., 1997; Holdgate et al., 2005).
The succeeding Jetty Member is represented by typical
red-beds deposited in alluvial fans by easterly directed,
episodic flows (Figs. 1 and 2). This unit exhibits a
grossly fining-upwards succession of conglomerates,
thin and discontinuous massive sandstones, and extensive iron-stained mudstones indicative of semi-arid
conditions (Webb and Fielding, 1993; McLoughlin and
Drinnan, 1997b; McLoughlin et al., 1997; Holdgate
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basin contiguous with the Son-Mahanadi Graben of
India has lately been disputed. Boger and Wilson (2003)
suggested that all major faulting of the Lambert Graben
took place during the Cretaceous, and that the Amery
Group sediments were not deposited in a narrow faultbounded depression, but must have been deposited in
one of the many sag basins that formed around the
palaeo-highland of east Antarctica (Tewari and Veevers,
1993; Veevers et al., 1996). Additionally, Holdgate et al.
(2005) indicated that the petrology and geochemistry of
the Permian coals of the Prince Charles Mountains are
more similar to those of the Godavari Basin than the
Son-Mahanadi Basin of India. Harrowfield et al. (2005)
rejected the notion that the Lambert Graben is a
primarily Cretaceous feature. Building on the argument
by Holdgate et al. (2005), they suggested that the
Lambert and Godavari basins developed in the Permian
and were juxtaposed across a broad intragondwanan rift
that later (in the Cretaceous) was reactivated to complete
separation of Antarctica and India.
2.2. Latest Permian — McKinnon Member
Fig. 2. Stratigraphy and depositional environments of the Amery
Group. D.F. Mbr = Dart Fields Member; D.T. Mbr = Dragons Teeth
Member.
et al., 2005). Palyno- and macrofloral data from the
uppermost Flagstone Bench Formation demonstrate a
return to more moist conditions in the Norian (Foster
et al., 1994; Cantrill and Drinnan, 1994; Cantrill et al.,
1995; McLoughlin et al., 1997), when sandstones and
minor carbonaceous siltstones of the McKelvey Member
were deposited by northerly directed rivers (McLoughlin
and Drinnan, 1997b; McLoughlin et al., 1997).
The traditional scenario that the Lambert Graben was
formed during the Permian as a narrow fault-bounded
The McKinnon Member is the uppermost unit of the
Bainmedart Coal Measures, first named and described
by McLoughlin and Drinnan (1997a). It conformably
overlies the Grainger Member and is succeeded conformably by the Flagstone Bench Formation (McLoughlin and Drinnan, 1997a). The McKinnon Member is an
approximately 530 m thick sequence of sandstones,
siltstones, shales and coals. Deposition took place
within alluvial settings, where low-sinuosity rivers transported the sediments in north to northeasterly directions (McLoughlin and Drinnan, 1997a). The lithologies
are basically the same as those in underlying members
of the Bainmedart Coal Measures, but at least in the
lower and middle parts of the McKinnon Member the
coal seams are thicker and more abundant (McLoughlin
and Drinnan, 1997a). This indicates that extended
periods of high water tables with low sediment input
must have prevailed during deposition of that part of the
member (McLoughlin and Drinnan, 1997a). Within the
upper 100 m of the McKinnon Member the coalseams
become progressively thinner and less abundant
(McLoughlin and Drinnan, 1997a). Together with
increasing ratios of silica and aluminium oxides in the
coals towards the top of the Bainmedart Coal Measures,
this suggests increased weathering and climatic drying
towards the end of the Permian (Holdgate et al., 2005).
Fifteen palynologically productive samples from the
McKinnon Member were investigated. The uppermost
sample 95/04 comes from the uppermost coal seam of
S. Lindström, S. McLoughlin / Review of Palaeobotany and Palynology 145 (2007) 89–122
93
Fig. 3. Composite lithostratigraphic column of the Permian to Early Triassic sequence in the Prince Charles Mountains, with selected important
palynoevents. Dotted line I refers to minimum upper boundary of the Lunatisporites pellucidus Zone based on the absence of true Aratrisporites in
the samples below. Dotted line II shows the position of a smaller but first extinction phase prior to the disappearance of the coal. Dotted line III shows
the position of a level with minor accelerated extinction rate and floral change. Asterisk ⁎ refers to independently dated palynozones (Foster and
Archbold, 2001). DTM = Dragons Teeth Member. Australian palynozonations mainly after: 1. Mory and Backhouse (1997), Helby et al. (1987);
2. Price (1997).
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S. Lindström, S. McLoughlin / Review of Palaeobotany and Palynology 145 (2007) 89–122
the Bainmedart Coal Measures (Fig. 3), just below the
upper boundary of the McKinnon Member.
2.3. Latest Permian to earliest Triassic — Ritchie
Member
South of Ritchie Point on the western side of Beaver
Lake (Fig. 1) the lowermost member of the Flagstone
Bench Formation, the Ritchie Member, conformably
overlies the McKinnon Member. The Ritchie Member
was named and described by McLoughlin and Drinnan
(1997b), and corresponds to “the lower Flagstone Bench
Formation” of Webb and Fielding (1993). The Ritchie
Member is distinguished from the preceding McKinnon
Member mainly by the lack of coals (McLoughlin and
Drinnan, 1997b). The unit is estimated to be more than
550 m thick. Medium- to very coarse grained, subfeldsarenites are the dominant lithology. Thin carbonaceous siltstones are present in the lowermost part, but
higher in the succession these are replaced by variegated, highly ferruginous siltstones (McLoughlin and
Drinnan, 1997b; McLoughlin et al., 1997). The
sandstone units are thick, laterally extensive, multistorey, interdigitating, and exhibiting trough and planar
cross-bedding. Many beds contain botryoidal ferruginous concretions and ferruginous laminae (McLoughlin
and Drinnan, 1997b). The Ritchie Member was
deposited by northwesterly to northeasterly directed
braided rivers on an alluvial plain (McLoughlin and
Drinnan, 1997b). Four palynologically productive samples were obtained from the lower part of the Ritchie
Member south of Ritchie Point. The lowermost sample,
95/01, comes from a thin siltstone 24 m above the lower
boundary of the unit, i.e. the top of the last coal in the
McKinnon Member (Fig. 3). Other samples from
Ritchie Member sediments exposed on Flagstone
Bench were analysed for palynomorphs by McLoughlin
et al. (1997).
Plate I. Selected Permian taxa from the McKinnon Member, illustrated at ×625, with sample and slide number and England Finder coordinates, and
LO number. Scale bar = 40 μm. (see plate on page 95)
a).
b).
c).
d).
e).
f).
g).
h).
i).
j).
k).
l).
m).
n).
o).
Leiotriletes directus 95/10:2 S34/2, LO 9894
Microbaculispora tentula 95/34:1 O30/3, LO 9895
Indospora clara 95/28:1 G19/4, LO 9896
Camptotriletes warchianus 95/26B:2 E22/2, LO 9897
Didecitriletes ericianus 95/34:1 J29/3, LO 9898
Laevigatosporites colliensis 95/12:1 Q27/2, LO 9899
Marsupipollenites triradiatus 95/12:1 P31/1, LO 9900
Guttulapollenites hannonicus 95/11:1 W38/1, LO 9901
Protohaploxypinus amplus 95/06:2 K26/3, LO 9902
Striatopodocarpidites cancellatus 95/06:2 Y33/4, LO 9903
Gondisporites raniganjensis 95/04:2 S33/4, LO 9904
Protohaploxypinus rugatus 95/11:1 U34/1, LO 9905
Striatopodocarpidites fusus 95/06:2 Q24/2, LO 9906
Praecolpatites sinuosus 95/26B:1 J29/2, LO 9907
Scheuringipollenites ovatus 95/22:2 X34/4, LO 9908
Plate II. Selected Triassic taxa from the Ritchie Member, illustrated at ×625, with sample and slide number and England Finder coordinates, and LO
number. Scale bar = 40 μm. (see plate on page 96)
a).
b).
c).
d).
e).
f).
g).
h).
i).
j).
k).
l).
m).
n).
o).
Rugulatisporites trisinus 95/05:1 G26/3, LO 9909
Triplexisporites playfordii 95/02:2 X40/2, LO 9910
Densoisporites nejburgii 95/02:1 K39/4, LO 9911
Uvaesporites verrucosus 95/02:1 U29/2, LO 9912
Densoisporites playfordii 95/02:1 H25/3, LO 9913
Falcisporites australis 95/05:1 Q32/1, LO 9914
Guttulapollenites hannonicus 95/02:1 F35/4, LO 9915
Lundbladispora sp. 95/02:1 K36/4, LO 9916
Protohaploxypinus microcorpus 95/01:1 K36/1, LO 9917
Lunatispoprites noviaulensis 95/02:1 W28/3, LO 9918
Klausipollenites schaubergeri 95/02:1 Q42/3, LO 9919
Protohaploxypinus samoilovichii 95/02:1 V33/3, LO 9920
Lunatisporites pellucidus 95/02:1 P29/4, LO 9921
Maculatasporites sp. 95/02:1 N34/4, LO 9922
Playfordiaspora cancellosa 95/02:2 X40/2, LO 9923
S. Lindström, S. McLoughlin / Review of Palaeobotany and Palynology 145 (2007) 89–122
Plate I (caption on page 94 ).
95
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S. Lindström, S. McLoughlin / Review of Palaeobotany and Palynology 145 (2007) 89–122
Plate II (caption on page 94 ).
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3. Palynological investigation
3.1. Materials and methods
Reconnaissance sampling of the P–T transition near
Ritchie Point was undertaken during a sedimentological
and stratigraphic investigation of the Amery Group
during the Austral summer of 1994–1995 (by Drs. S.
McLoughlin and A.N. Drinnan). Previously, the succession near Ritchie Point was considered to be entirely
Permian in age. The samples were processed using
standard palynological preparation techniques involving
HF, HCl, and HNO3. Two to three strew slides were
mounted from each sample. In some cases the samples
were subsequently treated with Schulze's solution, and
an additional set of slides prepared.
Quantitative investigation involved 500 counts of the
total organic content for each sample, dividing it into
coal and black phytoclasts, wood (brown and black),
non-woody plant tissue, cuticles, amorphous organic
matter (AOM), and palynomorph taxa. The palynomorph taxa/palynodebris ratio was noted, then counting
of palynomorphs (or in some cases the palynodebris)
continued until reaching 500 specimens. The remaining
strew slides were examined and additional specimens,
not included in the count, were recorded. Specimens
illustrated are identified with LO + number, and will be
housed at the Department of Geology, Lund University.
3.2. Palynostratigraphy
Australian Permian and Triassic strata have been the
focus of intensive palynological investigations for many
years. Hence, the well-established Australian palynozonation has become the “de facto” standard to which
many other Gondwanan assemblages are compared
(Fig. 3). However, there were regional differences in
palynofloral composition within Gondwana during the
Middle and Late Permian. For example, the fern spore
genus Dulhuntyispora contains many key-species for
the Middle to Late Permian, but outside Australia and
Timor (Basil Balme, pers. comm. 2005) only D.
granulata has been recognised in situ and it is only
represented by a few specimens in South Africa
(Anderson, 1977; Backhouse, 1991) and the PCMs
(Lindström, unpublished data). Despite this provincialism, palynofloral investigations of the entire Amery
Group have now provided a more fully resolved
biostratigraphic framework for correlation of the PCM
sedimentary succession (Fig. 3).
The PCM Permian succession is dominated by longranging taeniate bisaccate pollen, mainly Protohaplox-
97
ypinus and Striatopodocarpidites, and non-taenitae
bisaccates assigned to Scheuringipollenites. Fern spores
are generally scarce and this renders correlation with the
Australian palynozonation difficult since many of those
zones are based on the first appearance datum (FAD) of
specific fern taxa. Didecitriletes ericianus is one of the
Australian index species (Backhouse, 1991; Price,
1997) that also appears to have a synchronous inception
in Antarctica (Lindström, 1995a), Africa (Anderson,
1977) and India (Tiwari and Tripathi, 1992). The first
appearance of this fern spore defines the lower boundary of the D. ericianus Zone of Western Australia
(Backhouse, 1991), and APP4.2 Zone of Price (1997).
In the Bainmedart Coal Measures, D. ericianus has its
FAD in the Toploje Member (Fig. 3).
Another fern spore, Camptotriletes warchianus
(Plate I, d), first appears in the Dragons Teeth Member.
This species was originally described by Balme (1970)
from the Salt Range, West Pakistan, where it is a rare
component of the Amb, Wargal and Chhidru Formations. In Australia, this taxon has its FAD in the D.
parvithola Zone of Western Australia (Mory and
Backhouse, 1997), and in the Upper Stage 5 of Eastern
Australia (Foster, 1982) or APP5 of Price (1997).
Other taxa important in the Australian zonation
include Triplexisporites playfordii and Playfordiaspora
cancellosa. In eastern Australia the FAD of these taxa
marks the lower boundary of the P. cancellosa Zone
(Foster, 1982) or APP6 (Price, 1997), which can be
correlated with the independently dated Early Changhsingian uppermost Chhidru Formation (“White Sandstone” unit) in Pakistan (Foster et al., 1997). The P.
cancellosa Zone is succeeded by the Protohaploxypinus
microcorpus Zone, but according to Price (1997) the
transition between these zones differs from area to area
and they lack a clearly defined boundary. They are,
therefore, considered subunits of the APP6 Zone (Price,
1997). Neither the P. cancellosa nor P. microcorpus
zones are recognized in the Prince Charles Mountains
sequence. In this succession, both T. playfordii and P.
cancellosa have their FADs in the lowermost sample of
the Ritchie Member, which correlates with the Australian Lunatisporites pellucidus Zone (Fig. 3).
The palynostratigraphic definition of the Permian–
Triassic boundary in Gondwana has long been debated.
The first appearance of pleuromeiacean monolete cavate
spores assigned to Aratrisporites is favoured by some
authors as a key-taxon for the P–T boundary (Foster
et al., 1998), and in Australia Aratrisporites first appears in the Protohaploxypinus samoilovichii Zone
(Foster et al., 1998). Because the pleuromeiacean parent
plants of Aratrisporites may have been strongly facies
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dependent (Retallack, 1975, 1977), some authors instead consider the first appearance of gymnospermous
Lunatisporites pellucidus pollen to mark the P–T
boundary (Price, 1997) and this is also favoured herein.
In the Prince Charles Mountains a few small, inconspicuous, generally non-spinose Aratrisporites-type
spores occur in the Ritchie Member samples from
Ritchie Point, but as noted by Price (1997) such
specimens may instead be small aberrant Lundbladispora spores. In the Prince Charles Mountains a single
specimen of L. pellucidus is registered in the uppermost
coal sample 95/04, but it is consistently present in the
succeeding Ritchie Member samples (Fig. 6). The association of taxa, particularly L. pellucidus (Plate II, m),
Falcisporites spp., Densoisporites nejburghii (Plate II,
c), D. playfordii (Plate II, e), Lundbladispora spp. (e.g.
Plate II, h), Playfordiaspora cancellosa (Plate II, o), P.
samoilovichii (Plate II, l), P. microcorpus (Plate II, i),
and Triplexisporites playfordii (Plate II, b), found in the
Ritchie Member samples at Ritchie Point allows
correlation with the L. pellucidus Zone or APT1 of
Price (1997). The eastern Australian L. pellucidus Zone
can be subdivided based on the FAD of the fern spore
Rugulatisporites trisinus (Price, 1997). In the Prince
Charles Mountains spores assigned to R. trisinus (see
remarks under Appendix 1) are rare constituents in
samples 95/02 to 05 (Fig. 6). True members of Aratrisporites have only been recovered in samples from
the Ritchie Member on Flagstone Bench (Lindström,
unpublished data). Those were originally considered to
be roughly correlative to the upper two samples (95/07
and 95/05) from Ritchie Point (McLoughlin et al.,
Fig. 4. Relative abundance of palynodebris in the investigated samples from Ritchie Point in the Prince Charles Mountains.
S. Lindström, S. McLoughlin / Review of Palaeobotany and Palynology 145 (2007) 89–122
1997), but are now regarded to be somewhat younger
and equivalent to the P. samoilovichii Zone (Lindström,
unpublished data). The boundary between the L.
pellucidus and P. samoilovichii zones is independantly
dated as late early Griesbachian (Foster and Archbold,
2001).
3.3. Sedimentation rate
Calculating the average sedimentation rate for the
different units of the Amery Group is difficult. Initial
sedimentation in the Lambert Graben was probably first
generated and controlled by faulting and mass-wasting
of the basin flanks, as is indicated by the alluvial fan
deposits of the Radok Conglomerate. The later clastic
sedimentation of the Bainmedart Coal Measures was
principally governed by axial drainage systems, influenced by rainfall, linked to orbital climatic forcing, as
suggested by Fielding and Webb (1996), and by
Michaelsen and Henderson (2000) for the Late Permian
coal measures of the Bowen Basin, eastern Australia.
The coal seams within the Bainmedart Coal Measures
are laterally extensive and the alternation of peat-mire
systems and broad sandy fluvial tracts indicates strong
cyclic variation in the supply of clastic material. The
McKinnon Member coals are of sub-bituminous rank
suggesting a compaction ratio of around 6:1 from the
original peat beds. The strongly differential compaction
between peat and sandy beds and the variation in coal
seam abundance and thickness means that only a broad
estimate of sedimentation rates can be provided for this
succession. The only useful age constraints available are
palynomorph taxa. In the Prince Charles Mountains, the
fern spore Didecitriletes ericianus is first recorded in the
Toploje Member, 1874 m below the top of the uppermost coalseam, i.e. the interpreted Permian–Triassic
boundary at 251 Ma. Using the known FAD of D.
ericianus in the Late Roadian, ca 269 Ma, indicates an
average depositional rate for the Bainmedart Coal
Measures of 104 m/Ma. In comparison, the average
sedimentation rate of the Upper Permian Blackwater
Group in the northern Bowen Basin is 130 m/Ma in the
depocentre, and 70 m/Ma in the more marginal parts of
the basin (Michaelsen et al., 2001; Michaelsen, 2002).
An average sedimentation rate of 104 m/Ma for the
Bainmedart Coal Measures suggests that the entire
McKinnon Member is late Wuchiapingian to Changhsingian in age.
Calculating the sedimentation rate for the Triassic part
of the Amery Group is much more difficult. The estimated minimum thickness of the Triassic Flagstone
Bench Formation is 760 m (McLoughlin and Drinnan,
99
1997b). The N 72 m thick McKelvey Member is
palynologically dated as Norian (Foster et al., 1994),
leaving a minimum of 688 m for the pre-Norian
Triassic, and with the Carnian/Norian boundary at
216.5 Ma this equals a sedimentation rate of ca 20 m/
Ma. This very slow sedimentation rate implies a 1.2 Ma
duration for the 24 m sampling gap at the P–T transition. However, this is considered an under estimate of
the sedimentation rate as part of the Flagstone Bench
succession is concealed by ice, and because the silty
red beds of the Jetty Member probably represent a long
interval of very slow and episodic deposition in semiarid environments.
There are no definite age constraints for the continuous section at Ritchie Point, and the sedimentation
in the Ritchie Member is thought to have been subjected
to strongly fluctuating clastic discharge (McLoughlin
and Drinnan, 1997b). If the sedimentation rate for the
Ritchie Member is equal to that of the preceding
McKinnon Member, the 24 m sampling gap between the
last coal sample (95/04) and the first Ritchie Member
sample (95/01) would represent ca 230 000 years. However, the upper boundary of the Lunatisporites pellucidus Zone is independently dated as mid-Induan (ca
250.3 Ma) in Australia (upper lower Griesbachian of
Foster and Archbold, 2001). The absence of genuine
Aratrisporites from the Ritchie Member samples at
Ritchie Point suggests that the entire 183 m sampled
section can be assigned to the L. pellucidus Zone. In that
case, the maximum sedimentation rate for that part of
the section is 261 m/Ma, indicating that the 24 m
sampling gap represents only ca 92 000 years.
4. Palynofloral turnover
4.1. The Late Permian stable ecosystem
Palynoassemblages of the McKinnon Member indicate that the Late Permian vegetation was quite stable in
this area, and not fundamentally different from that
represented in the preceding members of the Bainmedart
Coal Measures (Lindström, personal observations). This
palynoflora is dominated by gymnospermous pollen
(Fig. 3), primarily the taeniate glossopterid bisaccate
pollen Protohaploxypinus and Striatopodocarpidites,
and by the non-taeniate bisaccate pollen Scheuringipollenites (Fig. 5). Alisporites species, mainly A.
splendens and A. tenuicorpus, are also present in some
samples. Monosaccate pollen are rare, the most common
forms being Densipollenites. Non-saccate monosulcate
and polyplicate pollen assigned to Marsupipollenites
striatus, M. triradiatus (Plate I, g), Praecolpatites
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Fig. 5. a) Relative abundance of selected palynotaxa representing major plant groups in the investigated samples from Ritchie Point, Prince Charles
Mountains. b) Continued from (a). The following palynofloral events are recognised in the section: (A) Level with a slightly elevated extinction rate
11% (4 samples from a 10 m thick stratigraphical interval, diversity = 75), proliferation of ferns and sphenophytes, common algae. (B) First extinction
phase (3 samples from a 2 m thick stratigraphical interval) where 19% of the registered spore/pollen taxa disappear (Diversity = 69). Similar
proliferation of ferns and sphenophytes as at level A. After this level the glossopterids appear to decline in diversity. (C) Second extinction phase (last
coal sample) last appearance of 33% of the spore/pollen taxa registered in the sample. Demise of glossopterid dominated swamp forests
(Diversity = 67). (D) Third extinction phase with loss of 14% of the registered spore/pollen taxa, and contemporaneous first major occurrence of
pioneering taxa. Proliferation of peltasperms, corystosperms, ferns and lycophytes (diversity = 77). (E) Fourth extinction phase (2 samples from an
11 m thick stratigraphic interval) where 35% of the spore/pollen taxa are registered for the last time, and contemporaneous second major occurrence of
pioneering taxa (diversity = 99). Continued proliferation of peltasperms, corystosperms and lycophytes, and also proliferation of probable bryophyte
spores. (F) Increase in corystosperms and continued proliferation of lycophytes and probable bryophytes (diversity = 71).
S. Lindström, S. McLoughlin / Review of Palaeobotany and Palynology 145 (2007) 89–122
101
Fig. 5 (continued ).
sinuosus (Plate I, n) and Ephedripites, are also generally
common. Brown wood is the dominant debris, whereas
cuticle fragments are generally very rare (Fig. 4). A
generally low spore/pollen ratio indicates that ferns,
sphenophytes, bryophytes and herbaceous lycopsids
played a subordinate role in the vegetation. Intervals
with increased spore/pollen ratios are associated with
the large coalseams (Fig. 4), where trilete fern spores
Osmundacidites (and morphologically similar taxa),
Horriditriletes and Lophotriletes increase in abundance
(Fig. 5). Monolete Laevigatosporites spores also
increase in abundance (Fig. 5), but these may represent
sphenophytes (Balme, 1995).
Several taxa, including Didecitriletes uncinatus,
Granulatisporites absonus, Horriditriletes ramosus,
Protohaploxypinus bharadwajii and P. pennatulus,
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have their LADs within a 2 m interval a little less than
50 m below the top of the uppermost coal. Protohaploxypinus samoilovichii, Klausipollenites sp. A,
Lueckisporites virkkiae, Indospora clara (Plate I, c),
Lunatisporites obex and Chordasporites australiensis
have their successive first appearances within the
McKinnon Member (Fig. 6). Throughout this unit the
taxonomic turnover rate is low, except for the sample
from the uppermost coalseam in which 22 taxa, i.e.
33%, have their LADs.
4.2. The end-Permian crisis and the taxa that
perished
The most striking palynofloral change at the end of
the Permian is a general decline in gymnospermous
pollen (Fig. 5), and especially the dramatic decrease of
glossopterid taeniate bisaccate pollen. Protohaploxypinus decreases from around 25% to b 1% relative
abundance over the 24 m interval from the uppermost
coal sample 95/04 to the lowest Ritche Member sample
Fig. 6. a) Palynostratigraphic range chart for the Permian–Triassic transition at Ritchie Point in the Prince Charles Mountains. b) Continued from (a).
c) Continued from (b): algal and acritach taxa.
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103
}
Fig. 6 (continued ).
95/01, and Striatopodocarpidites shows a similar
pattern changing from ca 6% to b 1% (Fig. taxa groups).
Glossopterid pollen do persist in the Ritchie Member,
but always comprise b 1% of the assemblages. The same
pattern in abundance is shown by the non-taeniate
bisaccate pollen Scheuringipollenites. The parent plant
of this commonly abundant and typically Permian
bisaccate genus is unknown, but it may also be allied
to the glossopterids.
Many typical Permian Gondwanan taxa that are
consistently present in the McKinnon Member have their
LADs in the uppermost coal sample, e.g. the majority of
species assigned to Protohaploxypinus and Striatopodocarpidites, together with Striatoabieites multistriatus,
Densipollenites spp., Praecolpatites sinuosus, Florinites
eremus, Microbaculispora tentula (Plate I, b) and Didecitriletes ericianus (Plate I, e). The virtual disappearance of glossopterid pollen can be directly linked to the
cessation of coal formation. The disappearance of the
peat-forming mire that hosted the glossopterids is a
conspicuous feature of many Permian–Triassic transitions in southeastern Gondwana. The glossopterids first
appeared during the late Palaeozoic glaciation, steadily
diversified in the ameliorating post-glacial temperate
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Fig. 6 (continued ).
climate during the Early and Middle Permian, and
markedly proliferated in the humid Late Permian
climate. The glossopterids were middle- to high-latitude
deciduous trees with roots that were adapted to semiaquatic conditions (Neish et al., 1993). The presence of
well-developed growth rings in glossopterid wood from
the PCMs shows that these plants were also subjected to
strong seasonal variations (McLoughlin et al., 1997;
Weaver et al., 1997). The narrow latewood and abrupt
termination of rings suggests that growth of the
Antarctic glossopterids was primarily controlled by
seasonal photoperiod variation. Despite the fact that the
glossopterids were deciduous trees, glossopterid cuticles are a relatively rare component in the McKinnon
Member palynodebris. The maceral cutinite also
constitutes a relatively minor portion (generally b 1%)
of coals sampled from the Bainmedart Coal Measures
(McLoughlin, unpublished data). Glossopterid cuticle
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is typically thin and large sheets are normally difficult to
prepare from compressed leaves. Thin and readily
degraded cuticles may be a function of the deciduous
nature of glossopterids, the prevailing humid, temperate
climate of the Late Permian, and the plants' affinities for
mire habitats, hence their little need for cuticular
protection from desiccation. Glossopterids were overwhelmingly the dominant plants in the PCMs during the
latest Permian, and were extremely well adapted to their
environment. It seems plausible that other taxa that
disappeared, or markedly decreased in number, at the
P–T transition were also adapted to the peat-forming
mires in which the glossopterids were the major
constituents.
4.3. Taxa that proliferated after the end-Permian event
The Ritchie Member palynoflora is also dominated
by gymnospermous pollen, although not to the same
degree as the McKinnon Member. In the Ritchie
Member, the gymnosperms are represented by peltaspermous or corystospermous bisaccate pollen, such as
the taeniate Lunatisporites spp., Protohaploxypinus
microcorpus and P. samoilovichii, and the non-taeniate
Falcisporites spp. and Alisporites spp. In the lowermost
Ritchie Member sample (95/01) fern spores assigned to
Brevitriletes spp. and Leiotriletes directus (Plate I, a),
together with Osmundacidites spp. and Dictyophyllidites spp., are common, however, all but the last of these
decrease in abundance in the succeeding samples.
Another striking feature of the Ritchie Member palynoflora is the high diversity and abundance of lycophyte
spores, mainly Densoisporites, Lundbladispora,
Kraeuselisporites and Uvaesporites species. Probable
bryophyte spores are minor constituents of the lowermost Ritchie Member assemblage, but increase in
abundance in the succeeding samples.
The spore/pollen ratio increases dramatically in the
Ritchie Member indicating that spore-producing plants
played a proportionately greater role in the earliest
Triassic plant community. This is further indicated by
the dramatic decrease of woody plant debris between
sample 95/04 of the uppermost coal in the McKinnon
Member and the lowermost sample of the Ritchie
Member, 95/01. Non-woody plant remains, including
cuticles, are the most common type of palynodebris in
the Ritchie Member. Lycophyte sporangia and megaspores are also notably abundant in mesofossil (N 200 m)
residues from this unit (McLoughlin et al., 1997).
From the palynological data it is evident that many of
the gymnospermous taxa that increase in abundance in
the Early Triassic assemblages were already present in
105
low numbers in the Permian. They appear to have
played a subordinate role in the glossopterid-dominated
plant community, perhaps occupying drier sites where
their macrofossils were less likely to be preserved.
These opportunists proliferated once the glossopterids
and their ecological associates were fading from the
scene.
So how did the surviving gymnosperms differ from
those that perished? One of the most abundant pollen
species in the earliest Triassic of the PCMs is Falcisporites australis (Plate II, f ). This non-taeniate bisaccate
pollen has been found in association with the peltasperm
Lepidopteris callipteroides (Carpentier) Retallack
(2002) (Retallack, 2002), and small pinnules of Lepidopteris sp. are prominent in the earliest Triassic sample
from the PCMs (McLoughlin et al., 1997). Retallack
(2002) argued that the thick cuticle, low stomatal index
and small-sized stomata of Early Triassic L. callipteroides leaves from the Sydney Basin indicated high
atmospheric concentrations of CO 2 . According to
Retallack (2002) L. callipteroides migrated southwards
from northern Gondwana in the Early Triassic, but
centres of origin and migration pathways are impossible
to determine from the fossil record (Patterson, 1999).
Nevertheless, this theory is supported by the recovery of
an Upper Permian Falcisporites-dominated palynoflora
and associated Dicroidium fossils in the Dead Sea
region in Jordan (Kerp et al., 2006). The Dicroidiumbearing Permian flora of Jordan indicate that corystosperms developed in the Late Permian in an extrabasinal
tropical lowland setting (Kerp et al., 2006). In fact,
many of the gymnosperms that played minor rolls in the
Permian of Gondwana may have been adapted to better
drained and perhaps more elevated areas than the
glossopterid dominated peat mires that developed in the
Gondwanan basins. The PCM Permian–Triassic succession was deposited within the Lambert Graben,
which is suggested to have been fed by a drainage
system one-fifth the area of East Antarctica (Adamson
and Darragh, 1991). Non-glossopterid gymnosperms
may have been significant components of the vegetation
through much of this upland region.
In the aftermath of the end-Permian crisis, pleuromeian/isoetalean lycophytes appear to have diversified
globally (Pigg, 1992; Kovach and Batten, 1993).
Although it is not obvious from the quantitative analysis, small percentages of lycophytes (Gondisporites
raniganjensis, Plate I, k; and Indotriradites spp.) are
present in the McKinnon Member (Fig. 6). However,
lycophytes definitely proliferate in the Ritchie Member
where, e.g. Densoisporites nejburgii accounts for more
than 5% of the assemblage in 95/01.
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4.4. Taxa that lingered
Several taxa already present, and locally common in
the Permian, appear not to have been greatly affected by
the Permian–Triassic crisis. Amongst these are the fern
spores Lophotriletes and Osmundacidites. These genera
have a slight decline in relative abundance in the Early
Triassic, but they also vary in representation throughout
the Late Permian. Leiotriletes directus is another fern
spore typically common in the Permian. In the
McKinnon Member this small, laevigate triangular
spore is consistently present, but never reaches greater
than 1.6% of any assemblage. In the lowermost Ritchie
Member sample it suddenly flourishes constituting 3.8%
of the palynoflora, but decreases dramatically in the
succeeding samples. Guttulapollenites hannonicus
(Plate I, h; Fig. 8) is another taxon that is traditionally
associated with the Permian. This gymnosperm pollen
rarely reaches 1% in the McKinnon Member, but
reaches 1.0 to 2.4% in the Ritchie Member.
4.5. Reworking
The aspect of reworking is critical when analysing
taxon ranges and mass-extinction events based on
microfossil data. Re-deposition of older material can
severely affect the interpretations of an ecological crisis
and its aftermath. As reworked material is quite
commonly encountered in palynological investigations,
it is necessary to estimate the degree of reworking in the
PCM Permian–Triassic transition. In the PCMs, a few
glossopterid pollen and some other typical Permian taxa
linger on into the Early Triassic but disappear within a
few hundreds of metres above the uppermost coal, e.g.
Microbaculispora micronodosa, M. trisina, and M.
villosa. It is tempting to suggest that these typical
Permian spores are entirely reworked. However, it
should be noted that they have also been encountered in
small numbers in other Gondwanan Early Triassic
sequences (see e.g. de Jersey, 1979). The likelihood of
having been reworked is determined by the palynomorph's state of preservation, colour, abundance, and
association with other contemporary taxa. Microbaculispora specimens encountered in the Ritchie Member
show no obvious signs of reworking, as they do not
differ in colour or state of preservation from the rest of
the palynoassemblage. Quantitatively, they are more
abundant than the few taeniate glossopterid pollen also
present in these assemblages. There is no known
Permian assemblage from the PCMs in which Microbaculispora outnumbers glossopterid pollen (Lindström, personal observation). If the lower Ritchie
Member Microbaculispora specimens are reworked,
then one would expect to find proportional representation of other typical Permian taxa such as glossopterid
pollen. Differential preservation of these groups was
probably not important because the durability of
glossopterid taeniate pollen is demonstated by the fact
that they are amongst the most commonly reworked
palynomorphs in younger (Late Mesozoic–Cenozoic)
strata from Seymour Island, west Antarctica (Askin and
Elliot, 1982). In the shelf sediments off-shore from
Prydz Bay and the Prince Charles Mountains, Permian
palynomorphs in general are the rarest reworked
elements (Kemp, 1972).
4.6. Diversity pattern
It is important to remember that fossil spore- and
pollen taxa do not necessarily equate to true plant taxa
(Lindström et al., 1997). Nevertheless, the diversity of
spore-pollen taxa across the P–T transition in the
PCMs reveals a surprising pattern. The number of taxa
registered in each sample of the McKinnon Member
varies between a minimum of 31 and a maximum of 69
(Fig. 6), whereas in the Ritchie Member it varies between 70 and 92. There is a jump in diversity from 66
taxa in the last McKinnon Member sample (95/04) to
77 taxa in the lowest Ritchie member sample (95/01),
and then to a maximum of 92 taxa in the second
Ritchie Member sample (95/02). Species diversity
declines slightly to 71 and 70 taxa respectively in the
succeeding samples (95/07 and 95/05). If expected
occurrences are taken into account, i.e. the local stratigraphical ranges of the different taxa are used instead
of “de facto” registrations in each sample, the diversity
in the lower and middle parts of the McKinnon
member is very constant, vaying between 81 and 85
taxa. In the uppermost part of the McKinnon Member
there is a drop in diversity to 75 taxa in samples 95/10
and 95/08, with a slight increase to 79 taxa in the
uppermost McKinnon Member sample (95/04). This is
followed by a marked increase to 90 taxa in the
lowermost Ritchie member sample, with a continuing
increase to 101 taxa in sample 95/02, followed by a
gradual decrease to 82 and 70 in the two succeeding
samples.
Ninety-eight typical Permian taxa are present from
the lower part of the McKinnon Member, or have been
registered in the preceeding members. After a stepwise
extinction pattern only 25 of these taxa are present in the
uppermost Ritchie Member sample, i.e. only 26% of the
typical Permian taxa survived up to this level in the
aftermath of the end-Permian crisis.
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4.7. Extinction pattern
The extinction pattern of spores and pollen across the
P–T boundary in the PCMs appears stepwise with a
major extinction between the uppermost coal sample of
the McKinnon Member and the lowermost Ritchie
Member sample (Fig. 6). Through most of the
McKinnon Member succession, few taxa have their
last occurrences (Fig. 6). Exceptions to this pattern
occur in the closely spaced samples 95/26B–95/29 and
95/11–95/8. At the lower level, a 10 m interval from
1963 to 1973 m, the combined LADs reach almost 11%
and the combined FADs are almost 12%, both slightly
higher than “normal”. At the higher level, a 5 m interval
from 2225 to 2230 m, the combined LADs reach 19%
and the combined FADs are only about 1%. However,
few of the disappearing taxa at these levels occur
regularly or in large numbers within the McKinnon
Member, and their last occurrences at a certain level may
be an artifact of incompleteness of the fossil record
(Signor and Lipps, 1982). Here, we use the range extension method of Marshall (1995) to test the confidence
levels of the palynostratigraphic ranges across the P–T
transition in the PCMs. In accordance with improvements by Wang and Marshall (2004), 20% range
extensions are used, and based on a minimum of four
occurrence levels throughout the McKinnon and Ritchie
members only about half of the taxa with LADs within
this interval can be used. The results alter the stepwise
extinction pattern very little (Fig. 6a, b). None of the
taxa that has its LADs in the interval covering samples
95/11, 10 and 08 extends its range up to or above the
topmost McKinnon Member sample (Fig. 6b). However, for this level the range extensions do show a more
gradual extinction pattern stretching over a 25 m
interval, than that of the true records. This 95/11 to
95/08 interval is taken to represent a first extinction
phase, signalling the initiation of the collapse of the
terrestrial ecosystem (Figs. 5a, b and 6a, b). Similarly,
none of the taxa that has its LAD in the uppermost coal
sample has its range extended up to or beyond the
lowermost Ritchie Member sample. The range extensions indicate that the taxa with LADs in the uppermost
McKinnon Member sample all disappear within an 8 m
interval starting 9 m above the last coal (i.e. between
2283 and 2291 m). This is taken to represent the second
and main phase of the end-Permian extinction in the
PCMs (Fig. 6a, b). The third extinction phase is represented by the LADs in the lowermost Ritchie Member
sample (Fig. 6a, b), the range extensions indicating that
the taxa disappear within a 7 m interval starting 8 m
above the sample level. All but one of the taxa that have
107
their LADs in sample 95/02 of the Ritchie Member have
their ranges extended up to or beyond the next sample
level. All the taxa with LADs at this level have their
ranges extended within a 21 m interval starting 9 m
above sample 95/02. In the next sample, 95/07, none of
the taxa has its ranges extended up to or above the next
sample level. In fact, all the taxa with LADs at 95/07,
except one, have range extensions falling within the
upper 8 m of the extension range interval from the
previous sample. The LADs of samples 95/02 and 07 are
taken to represent the fourth extinction phase in the
PCMs (Fig. 6a, b).
A 20% confidence level used on the FADs of Early
Triassic taxa, based on a minimum of four occurrence
levels, comprises all the taxa first appearing in the
lowermost Ritchie Member sample, and gives a range
extension downwards to 2286 m. The mean range
extension level for the LADs in the uppermost coal is
also 2286 m, i.e. the estimated position of the main endPermian extinction.
5. Patterns of change across the P–T boundary in
Gondwana
5.1. Sedimentological changes across Gondwanan P–T
transitions
The most apparent lithological and sedimentological
change across the P–T transition in the PCMs is the
cessation of coal (Figs. 2 and 3), and this is also a wellknown feature of P–T continental boundary strata in
several other southeastern Gondwana basins, notably the
Bowen and Sydney basins, Australia and the Transantarctic Mountains, central Antarctica (Retallack et al.,
1996; Taylor et al., 1989). In India, coals are widely
represented in Upper Permian strata but disappear
slightly below the P–T boundary. Upper Permian coals
are also represented in the eastern Karoo Basin, South
Africa, but they were replaced by redbeds well before the
P–T transition (Ward et al., 2000). The P–T boundary
has been less well studied in South America but
uppermost Permian strata of the Parana Basin are
dominated by red or varicoloured mudstones with scarce
Glossopteris leaves (Rohn and Rösler, 1989).
Apart from the disappearance of coal, McLoughlin
and Drinnan (1997b) noted that the relative proportion of
sandstone to siltstone increases through the upper part of
the McKinnon Member and lower part of the Ritchie
Member in the PCMs. There is a slight change in the
direction of sediment transport across the P–T transition;
from predominantly N to NE in the McKinnon Member
to mainly NW to NNE in the Ritchie Member
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(McLoughlin and Drinnan, 1997a,b). Sediment cyclicity
(fining-up sandstone–siltstone–coal packages) is well
developed in the lower members of the Bainmedart Coal
Measures (cycles average ca. 9–10 m; Fielding and
Webb, 1996), but is less well developed and less regular
in the McKinnon Member (McLoughlin and Drinnan,
1997a). Sediment cyclicity persists in the Ritchie
Member, but the cycles tend to be thinner (average ca.
5.6 m) compared to the preceding Bainmedart Coal
Measures (McLoughlin and Drinnan, 1997b; Holdgate
et al., 2005). The changes across the P–T transition in the
PCMs are interpreted as a shift from large, low-sinuosity
braided and minor meandering rivers and poorly drained
forest-mire environments, to medium-sized, low-sinuosity braided rivers with progressively more episodic
discharge (McLoughlin and Drinnan, 1997a,b).
Similar changes in fluvial style across the Permian–
Triassic transition have been reported from other
Gondwana basins. In the Raniganj Basin, India, the
P–T transition of the Banspetali section shows a drastic
sedimentological change (Sarkar et al., 2003). The
Upper Permian Raniganj Formation consists of alternating fine- to medium-grained white/grey, plagioclaserich sandstones, dark organic-rich shales and coal. The
lithologies of the succeeding Lower Triassic Panchet
Formation include sandstones rich in unaltered orthoclase, and grey to olive-green shales. The upper part of
the Panchet Formation includes reddish strata, and they
are succeeded by the highly immature, poorly sorted,
red sandstones and conglomerates of the Supra-Panchet
Formation (Sarkar et al., 2003). Tewari (1999) reported
a similar change in fluvial style from Late Permian
meandering river deposits to Early Triassic braided
fluvial sediments in the Godavari Basin, India. However, there are local discrepancies. In the GAM-7 borehole
in the Godavari Basin, the cessation of coals and
carbonaceous shale occurs more than 100 m below the
palynologically defined P–T boundary, and is succeeded by greenish gray sandstone and shale (Srivastava
and Jha, 1990).
Latest Permian sequences in the Karoo Basin, South
Africa lack coal. Instead, the major sedimentological
Fig. 7. Composite correlation chart of selected P–T transitions across Gondwana.
S. Lindström, S. McLoughlin / Review of Palaeobotany and Palynology 145 (2007) 89–122
change across the P–T transition is a rapid, basin-wide
change in fluvial style from meandering to braided river
systems (Ward et al., 2000). Below the South African P–
T boundary, sandstones deposited by large, high
sinuosity meandering rivers are interbedded with olive
grey and red mudstones (Ward et al., 2000; Steiner et al.,
2003). The P–T boundary is associated with a several
metres thick laminated sandstone-shale unit, under- and
overlain by sandstone and conglomerate (Ward et al.,
2000). Above the P–T transition, the Karoo Basin
sequences are characterized by sediments deposited by
braided river systems. The proportion of sandstone to
shale is higher than in the Permian, and the silts and
mudstones are predominantly maroon in colour instead
of olive gray (Ward et al., 2000). The drastic change was
interpreted as indicating increased sedimentation rates in
the earliest Triassic, due to catastrophic die-back of the
terrestrial vegetation that would normally prevent
erosion of river banks and hill slopes (Ward et al., 2000).
A similar scenario is reported from the northern
Bowen Basin in eastern Australia where the Permian–
Triassic boundary coincides with the lithostratigraphic
boundary between the coal-rich Rangal Coal Measures
of the Blackwater Group and the coal-lacking Sagittarius Sandstone of the Rewan Group (Michaelsen, 2002).
Although palynological data indicates a gradational
floristic change prior to the boundary, Michaelsen
(2002) found no evidence of any lithological changes
within the Rangal Coal Measures up to the boundary.
Instead, a sharp change in the sedimentary regime is
evidenced by Late Permian peat mire, sinuous braided
river channels, extensive crevasse splay, and small lake
deposits abruptly succeeded by high energy, braided
river sediments in the Early Triassic (Michaelsen, 2002).
The Permian–Triassic transition in the Transantarctic
Mountains is also marked by the cessation of coal at or a
few metres below the boundary, together with generally
thicker packages of trough cross-bedded sandstones in
the Triassic, and major changes in palaeosol composition (Retallack et al., 2005).
5.2. Palynofloral turnover in other Gondwanan P–T
transitions
Although there have been many studies of the
Gondwanan P–T palynofloral transition, they typically
report only general paterns of taxon turnover and include
very little or no quantitative palynological data. The
LADs and FADs of selected P–T transition taxa in key
Gondwanan basins are briefly reviewed here (Fig. 7).
Spores and pollen are very poorly preserved in the
P–T transitional strata of the Karoo Basin, South Africa
109
(Anderson, 1977). However, Steiner et al. (2003)
recently reported a 100% taxonomic turnover in the
Permian–Triassic Carlton Heights boundary section in
the Karoo Basin. The 1 m thick interval above the
boundary is 100% dominated by the putative fungal
palynomorph Reduviasporonites chalastus and woody
plant remains. The assemblage was interpreted to
represent proliferation of fungi upon large quantities
of decaying plant material (Steiner et al., 2003; Fig. 7).
This “fungal” spike separates 55.5 m of strata assigned
to the latest Permian Klausipollenites schaubergerii
zone (equivalent to the Australian APP6 or Protohaploxypinus microcorpus Zone), from a b0.5 m thick
interval assigned to the Early Triassic Kraeuselisporites–Lunatisporites zone (equivalent of the L. pellucidus
Zone); these strata succeeded by at least 12 m of
palynologically barren sandstones (Steiner et al., 2003,
Fig. 5). None of the constituents of the Permian
palynoflora in this succession, including Densoisporites playfordii, Triplexisporites playfordii and Playfordiaspora cancellosa was registered above the “fungal”
spike, where instead typical Early Triassic taxa e.g. L.
pellucidus, Kraeuselisporites cuspidus, and Lundbladispora brevicula were found (Steiner et al., 2003).
Despite the apparent high resolution detection of the P–T
section at Carlton Heights, some uncertainties remain
regarding the palynological signature in the Karoo
Basin. Palynomorph yields were apparently low and
several key taxa have patchy records in the range charts
provided by Steiner et al. (2003). The thick barren
intervals may also preclude identification of the full
ranges of key taxa. Furthermore, the “fungal” spike at the
Carlton Heights section is located 17 m above the P–T
boundary beds as defined by Retallack et al. (2003), and
according to Ward et al. (2005) well above the top of the
Permian based on carbon isotope data. However, it
should be noted that there are several typical Permian
taxa that appear to have their last occurrences between 19
and 24 m below the “fungal spike” zone (Steiner et al.,
2003; Fig. 5), possibly corresponding to an initial
extinction level.
The palynofloristic turnover at the P–T transition
within the Maji Ya Chumvi Formation, Kenya, is
characterised by the disappearance of 27% of latest
Permian taxa. It is accompanied by a decrease in the
number of acavate trilete spores, a slight decrease in the
abundance of cavate trilete spores, and a major increase
in the abundance of taeniate bisaccate pollen (Hankel,
1992). The latest Permian assemblage is equivalent to
the Australian APP6 or Protohaploxypinus microcorpus
Zone, and contains 38% cavate and 32% acavate spores,
18% taeniate bisaccate pollen, 7% monosulcate pollen
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and only 5% non-taeniate bisaccate pollen (Hankel,
1992). It is separated from an earliest Triassic assemblage by a 24.2 m palynologically barren interval
spanning the P–T boundary (Hankel, 1992). The earliest
Triassic palynoflora is represented in 18 samples over an
8.2 m thick interval and is dominated by taeniate bisaccate pollen (37–56%). Acavate spores are less frequent,
8–32%, and cavate spores vary between 12% and 37%.
It was correlated with the Lunatisporites pellucidus
Zone of Australia (Hankel, 1992). The putative fungal
palynomorph Reduviasporonites chalastus constitutes
24% of the latest Permian assemblage and is also present
but less common (4–10%) in the earliest Triassic. Lunatisporites pellucidus first occurs in the earliest
Triassic, constituting 5–9% of the microflora. Among
the 22 Permian taxa that disappeared at the P–T
transition were the important indices P. microcorpus,
Lundbladispora willmottii, P. crenulata (Wilson) Foster
(1979) and T. playfordii (Hankel, 1992). Of 34 taxa
identified in the younger assemblage, 53% have their
FADs in the earliest Triassic, e.g. D. playfordii and
Kraeuselisporites cuspidus. However, at least two of the
taxa that last occurred in the Permian (i.e. P. crenulata = P. cancellosa and T. playfordii) are present in an
even younger assemblage from the Lower Mariakani
Formation (correlated with the Australian P. samoilovichii Zone; Hankel, 1991), and could be considered
“Lazarus taxa” (Fig. 7).
According to Wright and Askin (1987) the
boundary between the Lower and Middle Sakamena
Group in Madagascar approximates the Permian–
Triassic boundary. The latest Permian palynofloral
assemblages are dominated by Guttulapollenites
hannonicus, Weylandites spp. and Lueckisporites
virkkiae. Glossopterid taeniate bisaccates assigned to
Protohaploxypinus and Striatopodocarpidites are generally common. The assemblages include rare specimens of Protohaploxypinus microcorpus (Wright and
Askin, 1987). Non-taeniate bisaccates are also common and include Platysaccus spp., Alisporites spp.,
Falcisporites spp., Scheuringipollenites spp., and
Klausipollenites schaubergerii (Wright and Askin,
1987). Pteridophyte spores are generally rare. The
first occurrence of rare Lunatisporites pellucidus is
registered in the uppermost Lower Sakamena outcrop
sample (Wright and Askin, 1987). Thirty-five percent
of the taxa in this latest Permian assemblage disappear
at the P–T transition. In contrast, the Early Triassic
assemblages are characterised by common to abundant
L. pellucidus. Striatopodocarpidites pantii and P.
microcorpus increase in abundance. Some typical
Permian taxa persist into the lowermost Middle
Sakamena, e.g. Densipollenites indicus, Protohaploxypinus limpidus, Striatopodocarpidites rarus and G.
hannonicus (Wright and Askin, 1987). In the earliest
Triassic assemblage 42% of the taxa appear for the
first time, including Densoisporites playfordii (Fig. 7).
A cored section, GAM-7, of the lower and middle
members of the Kamthi Formation in the Godavari
Graben, India, preserves a palynological succession
across the Permian–Triassic boundary, listed as assemblages I to V in ascending order (Srivastava and Jha,
1990). The Late Permian assemblages (I–IV) are
dominated by glossopterid bisaccate pollen, constituting
around 70–50% relative abundance. Other common and
important taxa are Scheuringipollenites, Densipollenites
and Osmundacidites, whereas Horriditriletes, Lophotriletes and Weylandites are locally common. Both
Densipollenites and Scheuringipollenites have last
appearances in assemblage III. The uppermost Permian
coal seam and carbonaceous shales were recorded
within the interval associated with assemblage II. Guttulapollenites is a rare component in the Permian
assemblages, except in IV where it increases to 29%
(Srivastava and Jha, 1990). Srivastava and Jha (1990)
correlated assemblage IV with the palynoflora from the
Chhidru Formation of the Salt Range (Balme, 1970) and
the Australian Protohaploxypinus microcorpus Zone
(latest Permian), on the basis of the common presence of
i.e. Triquitrites proratus, Playfordiaspora cancellosa,
L. noviaulensis, Falcisporites stabilis and P. microcorpus. Assemblage V, from a sample a little more than
12 m above that of assemblage IV (Srivastava and Jha,
1990), is correlated with the Lunatisporites pellucidus
Zone and is dominated by Lunatisporites (32%)
including L. pellucidus, and fern spores assigned to
Verrucosisporites (10%). Other common elements are
Lundbladispora, P. cancellosa, Limatulasporites, K.
schaubergerii and Alisporites. Glossopterid pollen are
apparently still present, but markedly decreased (Fig. 7).
Several papers have dealt with the palynology of the
P–T transition in the Bowen Basin in eastern Australia
(e.g. de Jersey, 1979; Foster, 1982), and these were
reviewed by Price (1997). In the GSQ Taroom8 borecore of Denison Trough in the western Bowen
Basin, the first appearance of Lunatisporites pellucidus
is registered about 50 m above the uppermost coal of the
Bandanna Formation, in the lower part of the Rewan
Group (de Jersey, 1979). The earliest Triassic assemblage is separated from the preceeding productive
sample by a ca 42 m barren interval (de Jersey, 1979).
Triplexisporites playfordii first appears within a few
metres above the uppermost coal in the Bandanna
Formation, thus placing the P–T boundary somewhere
S. Lindström, S. McLoughlin / Review of Palaeobotany and Palynology 145 (2007) 89–122
111
Fig. 8. Palaeobiogeographic distributions of Guttulapollenites hannonicus, Triplexisporites playfordii and Playfordiaspora cancellosa.
Palaeogeographic maps after Scotese (2001). Star denotes presence of taxon. Localities and occurrences from: 1. Oklahoma (Wilson, 1962);
2. Israel (Eshet, 1990); 3. Argentina (Ottone and Garcia, 1991; Zavattieri and Batten, 1996); 4. Pakistan (Balme, 1970); 5. Kenya (Hankel, 1991,
1992); 6. Tanzania (Hankel, 1987); 7. Zimbabwe (Falcon, 1973); 8. South Africa (Anderson, 1977; Steiner et al., 2003); 9. Madagascar (Hankel,
1993; Wright and Askin, 1987); 10. India, Godavari Graben (Srivastava and Jha, 1990); 11. India, Damodar and Rajmahal basins (Tiwari and
Tripathi, 1992); 12. Western Australia, Perth and Collie basins (Backhouse, 1991, 1993); 13. Western Australia, Bonaparte Basin (Helby, 1977,
unpublished report); 14. East Australia, Bowen Basin (de Jersey, 1979; Foster, 1979); 15. East Australia, Sydney Basin (Helby, 1973); 16. New
Zealand (de Jersey and Raine, 1990); 17. Antarctica, South Victoria Land (Kyle, 1977; Kyle and Schopf, 1982); 18. Antarctica, Dronning Maud
Land (Lindström, 1996); 19. Antarctica, Prince Charles Mountain (This paper; McLoughlin et al., 1997); 20. Zambia (Utting, 1979; Nyambe and
Utting, 1997). P. cancellosa has also been registered in the Middle Permian of Spain (Broutin, 1986).
in between the FADs of these two taxa (de Jersey, 1979).
Only 4% of the latest Permian taxa disappear by the
uppermost Permian sample. However, 25% of taxa
disappear by the earliest Triassic assemblage and 19%
of taxa are registered for the first time. In nearby GSQ
Springsure-1 bore (Fig. 6), L. pellucidus has its FAD
some 12 m above the last coal of the Bandanna
Formation, just below the boundary between the
Bandanna Formation and the Rewan Group (de Jersey,
1979). This assemblage is separated from the previous
productive sample by a barren interval of ca 11 m, and
T. playfordii first appears within the uppermost part of
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the youngest coalseam. In this well, only 4% of the
Permian taxa are present for the last time in the
uppermost productive sample of the Bandanna Formation. In the earliest Triassic assemblage 19% of the taxa
appear for the first time. On the basis of previous
studies, Michaelsen (2002) argued that palynofloral
change across the P–T boundary in the Bowen Basin is
gradual (Fig. 7) but, as noted above, the significant
sampling gap may overlook any dramatic turnover.
High-resolution palynological sampling across the
P–T boundary in the high-palaeolatitude Transantarctic
Mountains has not yet been undertaken. However,
McManus et al. (2002) recently reported sparse
glossopterid leaves several metres above the traditional
placement of the P–T boundary at the Buckley–
Fremouw formation transition. Scattered reports of
sparse earliest Triassic Glossopteris leaves elsewhere
in Gondwana (Pant and Pant, 1987) are consistent with
the PCM palynological evidence that a few elements of
the Glossopteris flora persisted into the very earliest
Triassic, presumably in isolated humid refugia.
5.3. Palaeobiogeographic patterns
Several taxa show interesting palaeogeographic and
biostratigraphic distributions in the Late Permian and
Early Triassic (Fig. 8). Guttulapollenites hannonicus
(Fig. 8) has been registered in Middle to Late Permian
sequences from Africa (Anderson, 1977; Falcon, 1973;
Utting, 1979), Madagascar (Wright and Askin, 1987),
Pakistan (Balme, 1970), India (Srivastava and Jha,
1990; Tiwari and Tripathi, 1992; Tiwari, 1999),
Antarctica (Balme and Playford, 1967; Lindström,
1995a, 1996; McLoughlin et al., 1997), and Australia
(Backhouse, 1993). In Madagascar (Wright and Askin,
1987) and India (Srivastava and Jha, 1990; Tiwari,
1999) G. hannonicus is particularly abundant in the
latest Permian. In the PCMs it is a rare but consistent
component in the Late Permian, but it is more common
in the Early Triassic, especially in the lowermost Ritchie
Member sample. There are only two other areas where
G. hannonicus has been recorded in the Early Triassic,
namely in the Salt Range of West Pakistan (Balme,
1970) and in Madagascar (Wright and Askin, 1987), and
together with the PCMs these areas appear to have acted
as the last refuges for the parent plant of G. hannonicus.
In many parts of Gondwana Triplexisporites playfordii and Playfordiaspora cancellosa occur together
(Fig. 8). Both have their FADs in APP6 (latest Permian)
microfloras of Australia (Price, 1997), in the early
Changhsingian uppermost Chhidru Formation in Pakistan (Balme, 1970; Foster et al., 1998), and in equivalent
microfloras in Kenya (Hankel, 1992) and South Africa
(Steiner et al., 2003). In India, P. cancellosa is also
known from the upper Raniganj Formation (Srivastava
and Jha, 1990; Tiwari and Tripathi, 1992), but T.
playfordii first occurs in the Early Triassic (Tiwari and
Tripathi, 1992). In the PCMs (this paper) and Madagascar (Wright and Askin, 1987) T. playfordii and P.
cancellosa are not registered in the Late Permian, but
first appear in the Early Triassic. In South Africa there
are no records of T. playfordii or P. cancellosa in the
Early Triassic (Steiner et al., 2003). In Kenya T.
playfordii and P. cancellosa are not recorded in the
earliest Triassic assemblages, but reappear in a younger
assemblage (Hankel, 1991, 1992). Triplexisporites
playfordii shows a similar pattern in Pakistan, whereas
P. cancellosa is registered there also in the Early
Triassic (Balme, 1970). Playfordiaspora cancellosa has
also been registered in a late Early Triassic assemblage
from the mid-Zambesi Valley in southern Zambia
(Nyambe and Utting, 1997), and in the late Middle
Triassic of Tanzania (Hankel, 1987), and Argentina
(Zavattieri and Batten, 1996). In New Zealand T.
playfordii and P. cancellosa are first registered in the
late Early Triassic (de Jersey and Raine, 1990), and in
South Victoria Land both taxa are first registered in the
Middle Triassic (Kyle, 1977).
In the Middle to Late Permian both these taxa have
only been registered outside Gondwana (Fig. 8). Playfordiaspora cancellosa (or closely related forms) are
present at locations within ± 20° of the equator in, e.g.
Oklahoma (Wilson, 1962), Southern Europe (Broutin,
1986) and Israel (Eshet, 1990), and Triplexisporites
playfordii in Israel alone situated 20°S (Eshet, 1990).
The distribution patterns suggest that during the latest
Permian both taxa migrated southwards, spreading along
a narrow belt between 65° and 45°S ranging from South
Africa in the west to eastern Australia (Fig. 8). In the
earliest Triassic they both appear to retreat eastwards
with T. playfordii still retaining a very narrow field of
distribution between 45° and 60°S, whereas P. cancellosa exhibits a wider distibution pattern from 35–60°S.
In the Middle Triassic the distribution patterns for
these taxa expand significantly. Triplexisporites playfordii then occupied an area stretching from Kenya in
the west to eastern Australia, and between 35° and
70°S. Playfordiaspora cancellosa had a similar distribution pattern in eastern Gondwana, but had also expanded its range further westwards to central and
southern Africa and South America (Fig. 8). Vijaya
(1995) also noticed the palaeobiogeographical pattern
of P. cancellosa and closely related species, suggesting
that the parent plant(s) characterized cool climates.
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However, this study indicates that the parent plant(s)
were adapted to perhaps seasonally dry conditions, and
that they migrated southwards during the Permian–
Triassic as the semi-arid belt continued to expand
further polewards.
In Australia, Triplexisporites playfordii is a consistent
and characteristic component of Triassic palynofloras, and
it is abundant in the redbeds of both western and eastern
Australia (Foster and Archbold, 2001). However, in
eastern Australia it is also a common constituent in the
latest Permian coal measures (Foster and Archbold, 2001),
e.g. in assemblages from the Rangal Coal Measures
(Michaelsen et al., 1999; Michaelsen, 2002). Foster and
Archbold (2001) suggested that the parent plant of T.
playfordii was part of the Late Permian swamp flora.
However, the palaeobiogeographical distribution of this
taxon through the Middle Permian to Middle Triassic
suggests that it was adapted to dry conditions, and that its
presence in South Africa, Kenya, Pakistan and Australia
by the latest Permian signals the on-set of drier climate in
those areas.
5.4. Contrasting palaeoecological trends across the P–T
transition
One interesting palaeoecological aspect is the quantitative changes of palynofloral groups across the P–T
boundary in Gondwana. Some quantitative changes, e.g.
the demise of glossopterid pollen, are useful biostratigraphic and palaeogeographic markers on a regional
scale. But many other quantitative changes are prominent only locally, as they mirror narrow geographic
environmental and climatic changes. The Late Permian
assemblages of the PCMs, overwhelmingly dominated
by glossopterid gymnosperms, were replaced in the
Early Triassic by assemblages containing higher proportions of spores from ferns and lycophytes. The exact
opposite scenario occurred in Kenya where the latest
Permian assemblage is dominated by acavate and cavate
trilete spores, and the Early Triassic palynoflora is
enriched in taeniate (although non-glossopterid) bisaccate pollen (Hankel, 1992). In terrestrial P–T boundary
sections in South China, spores are also dominant (85%
relative abundance) in the latest Permian assemblages
whereas in the earliest Triassic gymnospermous pollen
are most abundant with 60% (Peng et al., 2005, in press).
5.5.
13
C signal across the P–T transition
In terrestrial P–T sections from Gondwana there are
discrepancies between the palynologically inferred P–T
boundary and the negative δ13C excursion that is com-
113
monly used as a proxy for the boundary in the absence of
biostratigraphic or radiometric data. δ13C analyses from
the Bowen Basin, Australia, show a negative shift within
the Protohaploxypinus microcorpus Zone or APP6, but
with maximum negative values within the lowermost part
of the Lunatisporites pellucidus Zone or APT1 (Morante,
1996; Hansen et al., 2000). In Madagascar, de Wit et al.
(2002) recorded a sharp negative δ13C spike a few metres
above the palynologically defined P–T boundary in the
Morondava Basin, but also showed that the negative
excursion began some 8 m below the boundary. In the
Banspetali section in the Raniganj Basin, India, where the
uppermost Permian coal seam occurs ca 17 m below the
palynologically defined P–T boundary, Sarkar et al.
(2003) reported a ∼9‰ drop in organic carbon δ13C 8 m
above the palynologically inferred P–T boundary.
However, in the GAM-7 borehole from Godavari Basin
de Wit et al. (2002) found a large sharp negative δ13C
spike of ∼8‰ ca 10 m below the palynologically inferred
P–T boundary as defined by the FAD of L. pellucidus,
followed by a sharp reversal of ∼14‰. The large negative
spike is preceeded by a weak negative trend that appears
to start some 85 m below the boundary. In the GAM-7
borehole, the cessation of strata containing coal and carbonaceous shale occurs a little more than 100 m below the
P–T boundary (Srivastava and Jha, 1990).
No δ13C analyses were carried out on the Carlton
Heights section in South Africa but at Bethulie, also in
the Karoo Basin, the initial negative δ13C excursion
coincides with the first occurrence of Lystrosaurus at the
base of the laminated maroon mudstone beds (MacLeod
et al., 2000; Smith and Ward, 2001; Steiner et al., 2003).
According to Steiner et al. (2003) this equates to 20 m
below the fungal spike layer at Carlton Heights, but 17 m
below according to Retallack et al. (2003). No δ13C
values are yet available from the PCM succession.
The primary source of the organic matter has a strong
influence on the isotopic values of organic carbon
(Foster et al., 1997). Wood-derived kerogen is isotopically heavier (− 24‰) than an assemblage dominated by
spinose acritarchs (− 30‰), so bulk analyses of organic
shale rich in wood debris always yield isotopically light
signatures (Foster et al., 1997). This emphasises the
importance of conducting throrough palynological and
palynofacies studies on the same samples from which
bulk δ13Corg analyses are carried out.
5.6. P–T Gondwanan palaeogeography, sea levels and
palaeoclimate
Palaeogeographic reconstructions of Pangea place
the Prince Charles Mountains at 60°S around 250 Ma
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(Torsvik and Van der Voo, 2002), more or less at the
centre of the Gondwanan part of Pangea. The same
palaeogeographic reconstructions place the Bowen
Basin at 60–65°S, Karoo Basin at 60–50°S, Kenya
and Madagascar around 50–40°S, and the Indian
Godavari and Son-Mahanadi Basins at 55°S.
During the Middle to Late Permian a gradual warming trend is evident from the western to the eastern parts
of Gondwana. In southern and central Africa, coal
deposition ended during the Middle Permian (Cairncross, 2001), and warm, semi-arid conditions reigned
from the Capitanian (Visser, 1995). A gradual warming
trend through the Permian is also evident by the reduction in ice-rafted dropstones and other cryogenic
features in eastern Australian basins (Draper, 1983). The
decline in number and thickness of coal seams in the
PCMs, together with increasing ratios of silica and
aluminium oxides in the uppermost coals, suggest
increased weathering and climatic drying towards the
end of the Permian (Holdgate et al., 2005).
The Late Permian coals in the PCMs were deposited
during consistently moist and cool conditions under a
strongly seasonal light regime (Weaver et al., 1997;
McLoughlin and Drinnan, 1997a). Similarly, coal deposition continued more or less to the end of the Permian in
the Perth, Bowen, and Sydney basins. High-latitude coal
forest swamps developed in Gondwana during the Late
Permian due to global warming. However, by the end of
the Permian the intensifying greenhouse conditions in
combination with the strongly seasonal light regime
could no longer sustain the remaining coal forest swamps
even in polar latitudes (Kidder and Worsley, 2004).
Although the end-Permian has traditionally been
considered to correspond to a major sea-level lowstand
(Hallam, 1984; Ross and Ross, 1987), Hallam and
Wignall (1999) claimed that the P–T boundary corresponds to a phase of rising sea levels. Most Gondwana
basins are characterized by continental sediments in the
latest Permian, which favours the traditional eustatic
models. However, there is widespread evidence for
marine transgression in the Early Triassic (Wignall et al.,
1996). Marine spinose acritarchs, mainly Veryhachium
and Micrhystridium spp., have been encountered in
Early Triassic assemblages from Pakistan (Balme,
1970), Madagascar (Wright and Askin, 1987; Hankel,
1993), and Western Australia (Dolby and Balme, 1976;
Thomas et al., 2004). The earliest Triassic oil source
rocks (Kockatea Shale) in the Perth Basin were deposited
during a transgressive phase, either under strongly
anoxic conditions, or as a result of coastal upwelling,
and which lasted until the Dienerian, i.e. upper Induan
(Thomas et al., 2004). The basal beds of the Kockatea
Shale are characterized by a very low diversity marine
fauna and extensive stromatolitic layers. Tripathi (1997)
recorded marine acritarchs in the latest Permian of South
Rewa, Rajmahal and Damodar basins, and in the earliest
Triassic of South Rewa and Damodar basins. Following
the model proposed by Harrowfield et al. (2005), marine
inundation in the Early Triassic may have extended deep
into the supercontinent along a pre-existing (Permian)
intra-Gondwanan rift. An accurate eustatic signal may be
difficult to resolve in the absence of a well-developed,
tectonically undisturbed passive margin succession in
Gondwana.
The Early Triassic climate of the PCMs was less seasonal with increasing aridity as indicated by the initiation
of red-bed deposition (McLoughlin and Drinnan, 1997b;
McLoughlin et al., 1997). However, Retallack et al.
(2003) argued that the increased ratio of alumina in the
Early Triassic palaeosols compared to those of the
Permian, and variations in distribution of calcareous
nodules in the palaeosols indicate that the Early Triassic
climate of the Karoo Basin was less seasonal, and more
humid (semi-arid to sub-humid) than the strongly
seasonal arid palaeoclimate of the Late Permian.
It appears that the humid and strongly seasonal areas to
the east became drier and less seasonal across the P–T
transition, while the arid and strongly seasonal regions to
the west also became less seasonal, but more humid. Thus,
in the aftermath of the end-Permian event a generally
warmer and less seasonal climate appears to have prevailed
in southern Gondwana than during the Late Permian.
6. Implications for possible causes of the end-Permian
extinction
The cause of the end-Permian extinction event is
conjectural; proposed scenarios including 1) an asteroid
impact (Basu et al., 2003; Becker et al., 2004), 2) flood
basalt volcanism (Renne et al., 1995; Courtillot and
Renne, 2003), 3) release of methane from clathrates
(Ryskin, 2003), and most recently 4) extreme global
warming during the Permian initiated by the waning of
the Alleghenian/Variscan/Hercynian orogeny and further intensified by 2) and 3) (Kidder and Worsley, 2004).
Two large pulses of continental flood basalts occurred in
the latest Permian: the Emeishan basalts in South China
that appear to be synchronous with the end-Guadalupian
extinction (Lo et al., 2002), and emplacement of the
Siberian Traps was coeval with the end-Permian extinction (Mundil et al., 2004).
Ecosystem recovery after the end-Permian extinction is
known to have been unusually slow, with a duration at
least twice those following other major extinctions
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(Hallam, 1991; Erwin, 1998a,b). Several large fluctuations
of both organic and carbonate δ13C occurred during the
Early Triassic (MacLeod et al., 2000; de Wit et al., 2002;
Payne et al., 2004). These perturbations may in part be
linked to release of volcanigenic CO2 or methane hydrates
but they may also incorporate a biological signature. As
global marine biodiversity first began to rise in the
Smithian, i.e. early Olenekian (Payne et al., 2004), these
fluctuations coincided with the prolonged marine ecosystem recovery after the end-Permian crisis.
The PCM palynological record indicates that the
collapse of the terrestrial ecosystem was initiated already
prior to the deposition of the last coal. A first extinction
phase can be recognized within a 5 m interval starting
49 m below the last coal. The major extinction in the latest
Permian is directly associated with the last coal, and was
followed by continued stepwise extinction over a stratigraphic interval of 85 m. Using the calculated average
sedimentation rate for the Ritchie Member of 261 m/Ma
the extinction event may have lasted ca 325 000 years
although high-resolution sampling will be necessary to
constrain the finer details of floristic turnover. The PCM
data also show a similar stepwise floristic recovery of the
terrestrial ecosystem, where each level of extinction corresponds to the appearance of a suite of new taxa. The
increase in spore-pollen diversity in the Early Triassic of
the PCMs is, thus, a direct effect of continued stepwise
extinction offset by simultaneous floristic recovery. These
stepwise changes in the flora are consistent with the
turnover of terrestrial vertebrates through the Permian–
Triassic transition in the Karoo Basin, South Africa,
reported by Smith and Botha (2005).
The environmental changes that took place at the end
of the Permian were dramatic enough to eliminate the
glossopterid dominated ecosystem of southern Gondwana. In high latitude areas above 60°S, such as the PCMs
and Bowen Basin, coal deposition continued throughout
the Late Permian, while in other areas to the west and
north coal deposition ceased earlier. This supports the
theory that extreme global warming was occurring during
the Permian. Stepwise extinction of taxa typically associated with the glossopterid flora continued for a short
interval beyond the initial biotic crisis. Contemporaneous
stepwise introduction of new taxa, and Gondwana-wide
re-organisation of the terrestrial ecosystem show that the
effects of the end-Permian crisis were continuing to affect
the biota at least until the Olenekian.
7. Conclusions
All samples from the McKinnon Member of the
Bainmedart Coal Measures, Prince Charles Mountains,
115
including one from the uppermost coalseam (representing the top of the member), yielded typical Late
Permian assemblages dominated by glossopterid pollen. There are minor quantitative variations in the
palynoflora, but the samples contain essentially equivalent assemblages demonstrating that the Late Permian
terrestrial ecosystem was quite stable in this area. The
sample from the uppermost coal seam yielded the last
typically Permian glossopterid-dominated palynoflora.
The succeeding sample, collected from the lower
Ritche Member of the Flagstone Bench Formation,
24 m above the uppermost coal, contains a fundamentally different palynoflora of earliest Triassic aspect
demonstrating that the terrestrial ecosystem underwent
a dramatic change through that interval. However,
rather than a simple abrupt turnover, it is evident that
the immediate post-crisis phase was a period of constant floristic change. After the disappearance of a large
number (33%) of typical Permian taxa, an initial
increase in diversity of taxa of earliest Triassic aspect
occurred simultaneously with continued extinction of
lingering Permian taxa. Only later in the Early Triassic
do diversity levels appear to become more constant as
the number of FADs decrease. A similar initial
diversity increase instead of a decrease was also described by Looy et al. (2001) from East Greenland. In
the aftermath of the end-Permian crisis only 26% of the
typical Permian taxa present from the lower McKinnon
Member appear to have survived until late Induan times.
The average sedimentation rate indicates that the extinction event lasted ca 325000 years. This can be compared
with the vertebrate extinction data for the Karoo Basin,
which show that 69% of the vertebrate fauna disappeared
over a period of 300 000 years, followed by a lesser
extinction phase wiping out the remaining 31%
160000 years later (Smith and Botha, 2005).
The palynological pattern is matched by the
sedimentological record of the PCMs. Coal seams
show gradual diminution in thickness and spacing
below the Permian–Triassic transition, unlike that
reported from the Bowen Basin (Michaelsen, 2002).
The immediately overlying succession is dominated by
thick sandstone packages interspersed with sparse
carbonaceous shales. Higher in the Lower Triassic
succession carbonaceous beds disappear and are
replaced by thin red or mottled shales. Contemporaneous changes in fluvial style from meandering rivers or
coal-rich braided systems, to braided river systems with
episodic discharge have been recorded in different
Gondwanan basins across the P–T transition, and have
been attributed to increased sediment load due to loss of
vegetation cover.
116
S. Lindström, S. McLoughlin / Review of Palaeobotany and Palynology 145 (2007) 89–122
Comparisons of the palynology of P–T transitions
from different parts of Gondwana also show that there
were major differences in the composition of the regional palynofloras in the latest Permian, but that these
became more similar following the initial biotic crisis. In
humid areas, e.g. the PCMs, gymnospermous pollen
were overwhelmingly dominant in the latest Permian,
and following the mass-extinction lycophyte spores
proliferated. In semi-arid areas, e.g. Kenya, lycophyte
spores were already prominent constituents of the latest
Permian palynoflora. Instead, gymnosperms became
more dominant after the initial crisis. Humid areas became drier and at least some dry areas more humid. This
Gondwana-wide re-organisation of the terrestrial ecosystem indicates that dramatic changes of the atmospheric cells took place during the latest Permian to
earliest Triassic, as suggested by Kidder and Worsley
(2004). In the terrestrial setting this resulted in apparently more equable, sub-humid to semi-arid conditions across southern Gondwana.
The 24 m sampling gap between the uppermost
Bainmedart Coal Measures sample and the lowermost
Flagstone Bench Formation sample in the PCMs
currently prohibits analysis of the short term changes
associated with the end-Permian extinction. However,
the palynological record from the PCMs shows that after
the end-Permian crisis the terrestrial ecosystem was
already on its way to recovery in the Induan.
Acknowledgements
This study was funded by a Swedish Research
Council grant to SL and an Australian Research Council
Australian Research Fellowship to SM. The Australian
Antarctic Division provided financial and logistical
support during the expedition to Prince Charles Mountains during the Austral summer of 1994–1995. Editor
Henk Visscher and the reviewers John Backhouse and
Clinton B. Foster are gratefully acknowledged for valuable comments that improved the manuscript.
Appendix A. Alphabetical list of taxa identified in
this study
Alisporites asansolensis Maheshwari and Banerji
1975
Alisporites splendens (Leschik) Foster, 1979
Alisporites tenuicorpus Balme, 1970
Alisporites spp.
Apiculatisporis clematisi de Jersey, 1968
Aratrisporites spp.
Baculate sporomorph indet.
Baculatisporites bharadwaji Hart, 1963
Baculatisporites spp.
Barakarites rotatus (Balme and Hennelly) Bharadwaj and Tiwari, 1964
Bascanisporites undosus Balme and Hennelly 1956
Botryococcus sp.
Brazilea scissa (Balme and Hennelly) Foster, 1975
Brevitriletes hennellyi Foster, 1979
Brevitriletes levis (Balme and Hennelly) Bharadwaj
and Srivastava 1969
Calamospora tener (Leschik) de Jersey 1962
Camptotriletes warchianus Balme 1970
Cannanoropollis bilateralis (Tiwari) Lindström, 1995
Cannanoropollis janakii Potonié and Sah, 1960
Chordasporites australiensis de Jersey, 1962
Circulisporites parvus de Jersey, 1962
Clavatisporites spp.
Concavissimisporites grumulus Foster, 1979
Converrucosisporites cameronii (de Jersey) Playford
and Dettmann, 1965
Converrucosiporites sp. A
Converrucosisporites spp.
Convolutispora spp.
Corisaccites alutas Venkatachala and Kar, 1966
Crustaesporites spp.
Cycadopites follicularis Wilson and Webster, 1946
Cyclogranisporites sp. A
Cyclogranisporites spp.
Deltoidospora australis (Couper) Pocock, 1970
Deltoidospora breviradiatus (Helby)
Densipollenites indicus Bharadwaj, 1962
D. invisus Bharadwaj and Salujha, 1964
Densoisporites complicatus Balme 1970
Densoisporites nejburghii (Schulz) Balme 1970
Densoisporites playfordii (Balme) Dettmann, 1963
Densoisporites psilatus (de Jersey) Raine and de
Jersey in Raine et al. 1988
Dictyophyllidites mortonii (de Jersey) Playford and
Dettmann, 1965
Dictyotidium spp.
Dictyotriletes sp. A
Didecitriletes ericianus (Balme and Hennlly) Venkatachala and Kar, 1965
Didecitriletes uncinatus (Balme and Hennelly)
Venkatachala and Kar, 1965
Distriatites dettmannae (Segroves) Foster, 1979
Distriatites insolitus Bharadwaj and Salujha, 1964
Dulhuntyispora granulata Price, 1983
Ellipsovelatisporites sp.
Enzonalasporites vigens Leschik, 1955
Ephedripites sp. (large)
Equisetosporites steevesiae (Jansonius) de Jersey, 1962
S. Lindström, S. McLoughlin / Review of Palaeobotany and Palynology 145 (2007) 89–122
Falcisporites australis (de Jersey) Stevens, 1981
Falcisporites stabilis Balme 1970
Florinites eremus Balme and Hennelly, 1955
Fungal hyphae cf. Palaeancistrus spp.
Gnetaceaepollenites bulbiger Anderson 1977
Gondisporites raniganjensis Bharadwaj, 1962
Gondisporites sp. A
Goubinispora morondavensis (Goubin) Tiwari and
Rana, 1981
Granulatisporites absonus Foster, 1979
Granulatisporites sp.
Grebespora concentrica Jansonius, 1962
Guttatisporites sp.
Guttulapollenites hannonicus Goubin, 1965
Horriditriletes filiformis (Balme and Hennelly)
Backhouse 1991
Horriditriletes ramosus (Balme and Hennelly) Bharadwaj and Salujha 1964
Horriditriletes tereteangulatus (Balme and Hennelly) Backhouse 1991
Inaperturopollenites nebulosus Balme 1970
Inaperturopollenites sp.
Indospora clara Bharadwaj, 1962
Indospora laevigata Bharadwaj and Salujha emend.
Foster, 1979
Indotriradites niger (Segroves) Backhouse 1991
Indotriradites rallus (Balme) Foster 1979
Indotriradites sp. cf. I. reidii Foster, 1979
Interradispora daedala Foster, 1979
Interradispora versus Price, 1979
Klausipollenites schaubergeri (Potonié and Klaus)
Jansonius, 1962
Klausipollenites sp. A
Kraeuselisporites cuspidus Balme, 1963
Kraeuselisporites saeptatus Balme, 1963
Kraeuselisporites verrucifer de Jersey and Hamilton,
1967
Kraeuselisporites spp.Leiotriletes virkkii Tiwari, 1965
Laevigate sporomorph indet.
Laevigatosporites colliensis (Balme and Hennelly)
Venkatachala and Kar, 1968
Laevigatosporites spp.
Leiotriletes directus Balme and Hennelly, 1955
Limatulasporites fossulatus (Balme) Helby and
Foster 1979 in Foster, 1979
L. limatulus (Balme) Helby and Foster, 1979 in
Foster, 1979
Lophotriletes novicus Singh, 1964
Lueckisporites virkkiae Potonié and Klaus, 1954
Lueckisporites spp.
Lunatisporites acutus Leschik, 1955
Lunatisporites noviaulensis (Leschik) Foster, 1979
117
L. sp. cf. L. noviaulensis (Leschik) Foster, 1979
Lunatisporites obex (Balme) de Jersey 1979
Lunatisporites pellucidus (Goubin) Helby, 1972
Lunatisporites spp.
Lundbladispora brevicula Balme, 1963
Lundbladispora willmottii Balme, 1963
Lundbladispora spp.
Maculatasporites spp.
Marsupipollenites striatus (Balme and Hennelly)
Foster, 1979
Marsupipollenites triradiatus Balme and Hennelly,
1956
Mehlisphaeridium regulare Anderson 1977
Microbaculispora micronodosa (Balme and Hennelly) Anderson 1977
Microbaculispora tentula Tiwari, 1965
Microbaculispora trisina (Balme and Hennelly)
Anderson 1977
Microbaculispora villosa (Balme and Hennelly)
Bharadwaj, 1962
Minutosaccus sp.
Monosulcites spp.
Osmundacidites fissus (Leschik) Playford, 1965
Osmundacidites senectus Balme, 1963
Osmundacidites wellmanii Couper, 1953
Ovalipollis sp.
cf. Ovalipollis sp.
Peltacystia monile Balme and Segroves, 1966
Peltacystia venosa Balme and Segroves 1966
Platysaccus leschikii Hart, 1960
Platysaccus queenslandi de Jersey, 1962
Platysaccus spp.
Playfordiaspora cancellosa (Playford and Dettmann)
Maheshwari and Banerji, 1975
Polypodiidites sp. sensu Balme 1970
Polypodiisporites mutabilis Balme 1970
Potonieisporites balmei (Hart) Segroves, 1969
Potonieisporites novicus Bharadwaj, 1954
Praecolpatites sinuosus (Balme and Hennelly)
Bharadwaj and Srivastava, 1969
Protohaploxypinus amplus (Balme and Hennelly)
Hart, 1964
P. bharadwajii Foster, 1979
Protohaploxypinus jacobii (Jansonius) Hart, 1964
Protohaploxypinus limpidus (Balme and Hennelly)
Balme and Playford 1967
Protohaploxypinus microcorpus (Schaarschmidt)
Clarke, 1965
P. pennatulus (Andreyeva) Hart, 1964
Protohaploxypinus perexiguus (Bharadwaj and Salujha) Foster, 1979
Protohaploxypinus rugatus Segroves, 1969
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S. Lindström, S. McLoughlin / Review of Palaeobotany and Palynology 145 (2007) 89–122
Protohaploxypinus samoilovichii (Jansonius) Hart,
1964
Protohaploxypinus spp.
Pteruchipollenites gracilis (Segroves) Foster, 1979
Punctatisporites fungosus Balme, 1963
Punctatisporites spp.
Punctatosporites walkomii de Jersey, 1962
Punctatosporites sp.
Quadrisporites horridus Hennelly ex Potonié and
Lele, 1961
Reduviasporonites chalastus (Foster) Elsik, 1999
Retusotriletes clipeata Helby, 1966
Retusotriletes junior de Jersey and Hamilton, 1967
Retusotriletes nigritellus (Luber) Foster, 1979
Retusotriletes ”radiatus” sensu Helby 1973
Rewanispora foveolata de Jersey, 1970
Rugulatisporites trisinus de Jersey and Hamilton,
1967
Remarks: Specimens herein assigned to R. trisinus
differ slightly from the figured holotype in that the
rugulate ornamentation is generally somewhat denser and
finer, but they still conform with the original description
for the species.
Rugulatisporites spp.
Sahnites sp.
Scheuringipollenites maximus (Hart) Tiwari, 1973
Scheuringipollenites ovatus (Balme and Hennelly)
Foster, 1975
Schizopollis disaccoides Venkatachala and Kar, 1964
Schizopollis woodhousei Venkatachala and Kar,
1964
Semiretisporis sp. cf. S. denmeadii (de Jersey) de
Jersey, 1970
Small scabrate thin-walled sporomorphs indet.
Spinate sporomorph indet.
Striatoabieites multistriatus (Balme and Hennelly)
Hart, 1964
Striatopodocarpidites cancellatus (Balme and Hennelly) Hart, 1964
Striatopodocarpidites fusus (Balme and Hennelly)
Potonié, 1956
S. rarus (Bharadwaj and Salujha) Balme 1970
Striatopodocarpidites solitus (Bharadwaj and Salujha) Foster, 1979
Striatopodocarpidites spp.
Striomonosaccites brevis Bose and Kar, 1966
Striomonosaccites sp.
Sulcosaccispora alaticonformis (Malyavkina) de
Jersey, 1968
Tetraporina tetragona (Pant and Mehtra) Anderson
1977
Thick-walled rugulate/scabrate sporomorphs indet.
Thymospora cicatricosa (Balme and Hennelly) Hart,
1965
Triadispora sp. cf. T. epigona Klaus, 1964
Triplexisporites playfordii (de Jersey and Hamilton)
Foster, 1979
Triquitrites proratus Balme 1970
Tuberculatosporites aberdarensis de Jersey, 1962
Uvaesporites verrucosus (de Jersey) Helby in de
Jersey, 1971
Uvaesporites sp.
Verrucosisporites surangei Maheshwari and Banerji,
1975
Verrucosisporites sp. cf. V. trisecatus Balme and
Hennelly, 1956
Verrucosisporites spp.
Vitreisporites bjuvensis Nilsson, 1958
Vitreisporites pallidus (Reissinger) Nilsson, 1958
Weylandites lucifer (Bharadwaj and Salujha) Foster,
1975
Weylandites magmus (Bose and Kar) Backhouse
1991
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