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Concerning Mr. A. Hallams' Article on Gryphaea

Published online by Cambridge University Press:  01 May 2009

H.H. Swinnerton
H.H. Swinnerton
Affiliation:
3 Green Close, Wildwood Road, London, N.W.11.
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Abstract

The basis for Mr. Hallam' rejection of the hypothesis on the evolution of Liostrea into Gryphaea is briefly examined and is shown to be inadequate. For Liostrea real evidence is lacking. For Gryphaea the evidence, though copious, is unsound for it is based upon an improper treatement of his collections. Moreover, the features he measures are not sufficiently significant and the reader is left in considerable doubt as to the actual range of his measurements. His aspersion upon previous workers in this field is entirely unjustified.

Type
Articles
Information
Geological Magazine , Volume 96 , Issue 4 , August 1959 , pp. 307 - 310
Copyright
Copyright © Cambridge University Press 1959

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References

Hallam, A., 1959. On the supposed Evoluation of Gryphaea in the Lias. Geo. Mag., 99–108.CrossRefGoogle Scholar
Maclennan, R.M., and Trueman, A.E., 1942. Variation in Gryphaea incurva (Sow.) from the Lower Lias of Loach Aline, Argyll. Proc. Roy. Soc. Edin., B lxi, 211–239.Google Scholar
Swinnerton, H.H., 1939. Palaeontology and the Mechanics of Evoluation. Quart. Journ. Geol. Soc., xcv xxxiii–lxx.Google Scholar