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On the Supposed Evolution of Gryphaea in the Lias

Published online by Cambridge University Press:  01 May 2009

A. Hallam
A. Hallam
Affiliation:
Grant Institute of Geology, Edinburgh.
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Abstract

A re-examination of Hettangian and Lower Sinemurian oysters has led to the rejection of Trueman's hypothesis on the evolution of Liostrea into Gryphaea. Gryphaea assemblages from two horizons in different parts of Britain have been subjected to bivariate and size frequency analysis. The only detectable difference is a slight size increase up the succession. No “gryphaeoid” trend is discernible in Liostrea up the Hettangian succession and the change to Gryphaea is in consequence abrupt. All the oysters of Trueman's series are referred to what are considered to be two different Linnaean species.

Type
Articles
Information
Geological Magazine , Volume 96 , Issue 2 , April 1959 , pp. 99 - 108
Copyright
Copyright © Cambridge University Press 1959

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