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Radiations and extinctions in relation to environmental change in the marine Lower Jurassic of northwest Europe

Published online by Cambridge University Press:  08 April 2016

A. Hallam
A. Hallam*
Affiliation:
Department of Geological Sciences, University of Birmingham, Birmingham B15 2TT, England
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Abstract

A diversity and turnover analysis has been undertaken for a number of invertebrate groups in the Liassic of northwest Europe. There is a more or less steady rise in diversity from the early Hettangian through to the Pliensbachian, followed by a marked decline into the early Toarcian, after which it tends once more to increase. Ammonites stand out from the other invertebrates as having had an exceptionally high rate of turnover, with very short species durations.

Increase of neritic habitat area due to rise of sea level, and recolonization following the end-Triassic mass extinction event appear to be the promoters of diversity increase or radiation. Severe reductions of neritic habitat area with associated environmental deterioration, related either to episodic marine regressions or spreads of anoxic bottom waters, and bound up respectively with sea-level fall and rise, are seen as the prime factors responsible for increase of extinction rate. While the environmentally sensitive ammonites were affected by even minor regressions, the other, more eurytopic groups were evidently more resistant to these. The only event that warrants the term mass extinction, affecting nearly all the benthos and nekton but not the plankton, correlates precisely with the early Toarcian anoxic event. Several episodes can be recognized of migrations of organisms into Europe following extinctions.

Type
Articles
Information
Paleobiology , Volume 13 , Issue 2 , Spring 1987 , pp. 152 - 168
Copyright
Copyright © The Paleontological Society 

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References

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