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    Terrestrial ecosystems on North Gondwana following the end-Permian mass extinction
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    Keywords:
    Permian–Triassic extinction event
    Early Triassic
    Extinction (optical mineralogy)
    Terrestrial ecosystem
    A regional field study of ichnocoenoses in the Griesbachian Dinwoody Formation and the Smithian Sinbad Limestone Member revealed that benthic invertebrate tracemaking populations exhibited aspects of opportunistic behaviour following the end-Permian mass extinction. This study represents the first documentation of population strategies of ichnocoenoses following a mass extinction event. These trace fossil assemblages are characterised by low-to-moderate ichnodiversity, low-to-moderate bioturbation, small burrow widths, non-specialised behaviour and shallow tiering. Our data combined with other published studies indicate that various ecological characteristics of ichnocoenoses differed by environment, paleolatitude and stage through the Early Triassic. The pattern of opportunistic behaviour is likely attributed to repeated intervals of deleterious environmental conditions similar to those that caused the end-Permian mass extinction.
    Permian–Triassic extinction event
    Burrow
    Early Triassic
    Extinction (optical mineralogy)
    Marine invertebrates
    Bioturbation
    Citations (64)
    The Permian/Triassic mass extinction plays a great role in the evolutionary history of the Earth.After that,the revolution of species was accelerated greatly.The paper summarizes simply the research results of geochemists,geologists and paleontologists in recent years,including dating of the event and several hypotheses.Especially,we described in detail the exterrestrial impact(asteroid or comet),volcanic eruption,anoxia and marine acidification,and then made a simple analysis and discussion in the significance of mass extinction.
    Permian–Triassic extinction event
    Early Triassic
    Extinction (optical mineralogy)
    Trias
    Citations (0)
    Permian–Triassic extinction event
    Extinction (optical mineralogy)
    Early Triassic
    Citations (0)