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Permian-triassic life crisis on land.
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The Permian-Triassic boundary at 251 million years ago was a time of abrupt decline in both diversity and provincialism of floras in southeastern Australia and extinction of the Glossopteris flora.Abstract:
Recent advances in radiometric dating and isotopic stratigraphy have resulted in a different placement of the Permian-Triassic boundary within the sedimentary sequence of the Sydney Basin of southeastern Australia. This boundary at 251 million years ago was a time of abrupt decline in both diversity and provincialism of floras in southeastern Australia and extinction of the Glossopteris flora. Early Triassic vegetation was low in diversity and dominated by lycopods and voltzialean conifers. The seed fern Dicroidium appeared in the wake of Permian-Triassic boundary floral reorganization, but floras dominated by Dicroidium did not attain Permian levels of diversity and provinciality until the Middle Triassic (244 million years ago).read more
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Large igneous provinces and mass extinctions
TL;DR: In this paper, the authors compare the timing of mass extinctions with the formation age of large igneous provinces and reveal a close correspondence in five cases, but previous claims that all such provinces coincide with extinction events are unduly optimistic.
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Oceanic Anoxia and the End Permian Mass Extinction
TL;DR: Data on rocks from Spitsbergen and the equatorial sections of Italy and Slovenia indicate that the world's oceans became anoxic at both low and high paleolatitudes in the Late Permian, which may have been responsible for the mass extinction at this time.
Book
An introduction to organic geochemistry
Stephen Killops,Vanessa Killops +1 more
TL;DR: In this paper, the authors investigated the long-term fate of organic matter in the geosphere and its role in sedimentary organic matter preservation and degradation in the geological timescale.
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Comparative Earth History and Late Permian Mass Extinction
TL;DR: The repeated association during the late Neoproterozoic Era of large carbon-isotopic excursions, continental glaciation, and stratigraphically anomalous carbonate precipitation provides a framework for interpreting the reprise of these conditions on the Late Permian Earth.
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Paleophysiology and End-Permian Mass Extinction
TL;DR: Paleoenvironmental observations have been used to support the hypothesis that an end-Permian trigger, most likely Siberian Trap volcanism, touched off a set of physically-linked perturbations that acted synergistically to disrupt the metabolisms of latest Permian organisms as discussed by the authors.
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Journal ArticleDOI
Insect diversity in the fossil record
TL;DR: Compilation of the geochronologic ranges of insect families demonstrates that their diversity exceeds that of preserved vertebrate tetrapods through 91 percent of their evolutionary history.
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The great Paleozoic crisis
TL;DR: Erwin this article discusses the Permian extinction crisis and concludes that the crisis was due not to any one factor but to the juxtaposition of various and presumably unrelated causes of biotic stress.
Journal ArticleDOI
Permian-Triassic extinction: Organic δ13C evidence from British Columbia, Canada
TL;DR: The Permian-Triassic extinction is documented geochemically in a marine sequence deposited in a basinal setting at Williston Lake, northeastern British Columbia, by using elemental and isotopic organic geochemical data from well-preserved sedimentary rocks as mentioned in this paper.