Results 21 to 30 of about 3,958,760 (345)

The end-Triassic mass extinction event [PDF]

open access: yes, 1990
The end-Triassic mass extinction event, one of the five biggest in the Phanerozoic, is clearly marked in the marine realm by the almost total extinction of the ammonites, final disappearance of the conodonts, collapse of the reef ecosystem, and substantial changes in other groups.
A. Hallam
openaire   +2 more sources

Late Frasnian Mass Extinction: Conodont Event Stratigraphy, Global Changes, and Possible Causes [PDF]

open access: green, 1988
Several abrupt changes in conodont biofacies are documented to occur synchronously at six primary control sections across the Frasnian-Famennian boundary in Euramerica. These changes occurred within a time-span of only about 100,000 years near the end of
Charles A. Sandberg   +3 more
openalex   +2 more sources

Long duration of benthic ecological recovery from the early Toarcian (Lower Jurassic) mass extinction event in the Cleveland Basin, UK

open access: yesJournal of the Geological Society, 2022
The Cleveland Basin of Yorkshire, UK, hosts one of the most iconic Lower Jurassic rock successions for studying the Toarcian Oceanic Anoxic Event and the associated mass extinction, yet our understanding of the subsequent recovery is limited.
J. W. Atkinson, C. Little, A. Dunhill
semanticscholar   +1 more source

Impact of K-Pg Mass Extinction Event on Crocodylomorpha Inferred from Phylogeny of Extinct and Extant Taxa

open access: yesbioRxiv, 2021
Crocodilians and their allies have survived several mass extinction events. However, the impact of the K-Pg mass extinction event on crocodylomorphs is considered as minor or non-existent although other clades of archosaurs, e.g., non-avian dinosaurs and
Andrew F. Magee, S. Höhna
semanticscholar   +1 more source

Multi-variate model of T cell clonotype competition and homeostasis

open access: yesScientific Reports, 2023
Diversity of the naive T cell repertoire is maintained by competition for stimuli provided by self-peptides bound to major histocompatibility complexes (self-pMHCs).
Daniel Luque Duque   +5 more
doaj   +1 more source

Bioindicators of severe ocean acidification are absent from the end-Permian mass extinction

open access: yesScientific Reports, 2022
The role of ocean acidification in the end-Permian mass extinction is highly controversial with conflicting hypotheses relating to its timing and extent.
William J. Foster   +5 more
doaj   +1 more source

The end-Cretaceous plant extinction: Heterogeneity, ecosystem transformation, and insights for the future

open access: yesCambridge Prisms: Extinction, 2023
The Cretaceous–Paleogene (K–Pg) mass extinction was geologically instantaneous, causing the most drastic extinction rates in Earth’s History. The rapid species losses and environmental destruction from the Chicxulub impact at 66.02 Ma made the K–Pg the ...
Peter Wilf   +2 more
doaj   +1 more source

Sedimentology of the continental end‐Permian extinction event in the Sydney Basin, eastern Australia

open access: yesSedimentology, 2020
Upper Permian to Lower Triassic coastal plain successions of the Sydney Basin in eastern Australia have been investigated in outcrop and continuous drillcores.
C. Fielding   +9 more
semanticscholar   +1 more source

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