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Title:
Permain-Triassic Life Crisis on Land
Authors:
Retallack, G. J.
Publication:
Science, Volume 267, Issue 5194, pp. 77-80 (Sci Homepage)
Publication Date:
01/1995
Origin:
JSTOR
DOI:
10.1126/science.267.5194.77
Bibliographic Code:
1995Sci...267...77R

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).
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