Journal ArticleDOI
Gondwanan floristic and sedimentological trends during the Permian–Triassic transition: new evidence from the Amery Group, northern Prince Charles Mountains, East Antarctica
Reads0
Chats0
TLDR
In this paper, the authors placed the Permian-Triassic boundary within the Amery Group of the Lambert Graben at the contact between the Bainmedart Coal Measures and overlying Flagstone Bench Formation, based on the first regular occurrence of Lunatisporites pellucidus and the first appearance of Aratrisporites and Lepidopteris species.Abstract:
The Permian-Triassic boundary within the Amery Group of the Lambert Graben is placed at the contact between the Bainmedart Coal Measures and overlying Flagstone Bench Formation, based on the first regular occurrence of Lunatisporites pellucidus and the first appearance of Aratrisporites and Lepidopteris species. The Permian-Triassic boundary is marked by the extinction of glossopterid and cordaitalean gymnosperms, and by the disappearance or extreme decline of a range of gymnospermous and pteridophytic palynomorph groups. Earliest Triassic macrofloras and palynofloras of the Flagstone Bench Formation are dominated by peltasperms and lycophytes; corystosperms, conifers, and ferns become increasingly common elements of assemblages through the Lower Triassic part of the formation and dominate floras of the Upper Triassic strata. The sedimentary transition across this boundary is conformable but marked by a termination of coal deposits; overlying lowermost Triassic sediments contain only carbonaceous siltstones. Typical red-bed facies are not developed until at least 100 m above the base of the Flagstone Bench Formation, in strata containing ?Middle Triassic palynofloras. Across Gondwana the diachronous disappearance of coal deposits and appearance of red-beds is suggestive of a response to shifting climatic belts, resulting in progressively drier seasonal conditions at successively higher palaeolatitudes during the Late Permian to Middle Triassic. The abrupt and approximately synchronous replacement of plant groups at the Permian-Triassic boundary suggests that factors independent of, or additional to, climate change were responsible for the turnover in terrestrial floras.read more
Citations
More filters
Journal ArticleDOI
The breakup history of Gondwana and its impact on pre-Cenozoic floristic provincialism
TL;DR: The broad succession of pre-angiosperm floras is documents, the distinctive elements of the Early Cretaceous Gondwanan floras immediately preceding the appearance of angiosperms are highlighted and it is suggested that latitudinal controls strongly influenced the composition of GONDwananFloras through time even in the absence of marine barriers between Gondwana and the northern continents.
Book ChapterDOI
End-Permian mass extinctions: A review
TL;DR: A review of the past decade that defines the probable causes of the mass extinction and evaluates several extinction hypotheses is presented in this article. But the cause of the extinction remains unclear, and a series of constraints on speculation have been established in the past few years.
Journal ArticleDOI
Mass extinction events and the plant fossil record
TL;DR: Reconstructing the vegetation dynamics associated with mass extinction events will elucidate the role of floral change in faunal mass extinction and provide a better understanding of how plants have historically responded to global environmental change similar to that anticipated for the authors' future.
Journal ArticleDOI
Impacts of global warming on Permo-Triassic terrestrial ecosystems
TL;DR: The effects of the end-Permian mass extinction on continental habitats and on terrestrial life have been extensively studied by geologists and palaeontologists as mentioned in this paper, with the effects on land were substantial, with massive erosion following the stripping of vegetation associated with long-term aridification and short-term bursts of warming and acid rain.
References
More filters
Book
Geological atlas of Western and Central Europe
TL;DR: In this article, the authors discuss the permo trassic devlopment of pangea and the pangean disintegration: opening of the central atlantic the north and the neo-tethys.
Journal ArticleDOI
Synchrony and causal relations between permian-triassic boundary crises and siberian flood volcanism.
TL;DR: Analysis of 40Ar/39Ar data from two tuffs in southern China yielded a date comparable to the inception of main stage Siberian flood volcanism at 250.0 � 0.2 million years ago for the Permian-Triassic boundary.