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Geologically rapid Late Triassic extinctions: Palynological evidence from the Newark Supergroup

By
S. J. Fowell
S. J. Fowell
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B. Cornet
B. Cornet
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P. E. Olsen
P. E. Olsen
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Published:
January 01, 1994

Orbitally controlled, sedimentary cycles of the Newark Supergroup permit palyniferous Late Triassic sections to be calibrated in time. Carnian palynofloras from the Richmond basin exhibit 2-m.y. fluctuations in the spore/pollen ratio, but taxonomic composition remains stable. Diversity of Norian and Rhaetian palynofloras increases prior to a 60% reduction at the Triassic/Jurassic boundary. The extinction of Late Triassic palynomorph species is coincident with a spike in the spore/pollen ratio and approximately synchronous with the last appearances of tetrapod taxa and ichnofossil genera. This geologically brief episode of biotic turnover is consistent with bolide impact hypotheses.

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GSA Special Papers

Pangea: Paleoclimate, Tectonics, and Sedimentation During Accretion, Zenith, and Breakup of a Supercontinent

George O. Klein
George O. Klein
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Geological Society of America
Volume
288
ISBN print:
9780813722887
Publication date:
January 01, 1994

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