Permian-Triassic Life Crisis on Land

  title={Permian-Triassic Life Crisis on Land},
  author={Gregory J. Retallack},
  pages={77 - 80}
  • G. Retallack
  • Published 6 January 1995
  • Geography, Environmental Science
  • Science
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… 
The Permian–Triassic boundary in Antarctica
The Permian ended with the largest of known mass extinctions in the history of life. This signal event has been difficult to recognize in Antarctic non-marine rocks, because the boundary with the
The delayed resurgence of equatorial forests after the permian-triassic ecologic crisis.
The reconstructed pattern of vegetational change suggests that habitat restoration, migration, and evolutionary processes acted synergistically, setting the stage for successional replacement of lycopsid dominants by conifers within a period of approximately 0.5 million years.
Landscape ecological shift at the Permian‐Triassic boundary in Antarctica
Palaeosols across the Permian‐Triassic boundary in Antarctica provide evidence of a marked change in ecosystems at this greatest of all extinctions in the history of life on Earth. The boundary can
Typical Triassic Gondwanan floral elements in the Upper Permian of the paleotropics
Permian floras of the Middle East often show a mixture of Euramerican, Cathaysian, and Gondwanan elements. We report several species of Dicroidium , a seed fern typical for the Triassic of Gondwana,
Pattern of marine mass extinction near the Permian-Triassic boundary in South China.
A statistical analysis of the occurrences of 162 genera and 333 species confirms a sudden extinction event at 251.4 million years ago, coincident with a dramatic depletion of delta13C(carbonate) and an increase in microspherules.
Vertebrate extinction across Permian–Triassic boundary in Karoo Basin, South Africa
Distinct assemblages of paleosols above and below the Permian–Triassic boundary in the Karoo Basin of South Africa are evidence for reorganization of ecosystems following this greatest of all mass
Comparative Earth History and Late Permian Mass Extinction
The repeated association during the late Neoproterozoic Era of large carbon-isotopic excursions, continental glaciation, and stratigraphically anomalous carbonate precipitation provides a framework
The Vegetation of Antarctica through Geological Time
1. Introduction 2. Colonization of the land 3. Deglaciation and colonization of the South Pole 4. Mass extinction and life in the Triassic 5. Continental break up and its impact on Jurassic


Permian-Triassic extinction: Organic δ13C evidence from British Columbia, Canada
The Permian-Triassic (P-T) extinction is documented geochemically in a marine sequence deposited in a basinal setting at Williston Lake, northeastern British Columbia, by using elemental and isotopic
Insect diversity in the fossil record.
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.
The Great Paleozoic Crisis
Are you looking for an exciting book in Geology? Every textbook tells that nothing in Earth history has been more puzzling than that great wave of extinctions that swept the Earth round about 250
Evolution of Isoetalean Lycopsids
The lycopsid reduction series proposed the derivation of the extant guillwort Isoetes from the Carboniferous lepidodendrids through a progressive reduction in both stems and stigmarian rooting systems.
Completeness of the rock and fossil record: some estimates using fossil soils
  • G. Retallack
  • Environmental Science, Geography
  • 1984
Surprisingly, there is a relationship between rates of sediment accumulation and the time spans for which they have been calculated. This relationship can be used to estimate expected rates for
Fundamentals of Palaeobotany.
Advances in the Study of the Sydney Basin- Newcastle, New South Wales (University of New- castle
  • New En- gland Orogen, Eastem Australia,
  • 1993
The geology of the commonwealth of Australia