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A Revision of the Fauna of the North Welsh Conocoryphe viola Beds implying a Lower Cambrian Age

Published online by Cambridge University Press:  01 May 2009

B. F. Howell  and
C. J. Stubblefield
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Abstract

Fossils collected during the past sixty years from the uppermost division of the approximately 2,000 ft. thick Llanberis Slates have been re-examined. All but one fossil came from the famous Penrhyn Quarries at Bethesda, Caernarvonshire. The fauna is described as containing Pseudatops viola (H. Woodward), Eodiscus sp., cf. Protolenus howleyi (Walcott), Hyolithes cf. hathewayi G. F. Matthew, H. sp., and a fragmentary crustacean. The last offers no evidence of age but the remainder are considered to indicate a high Lower Cambrian horizon. Illustrations of some of these fossils are given for the first time. The Hyolithes is interpreted as carrying a pair of fin-like skeletal outgrowths and the morphological significance of these is discussed in a statement which comments on the obscure systematic position of the Hyolithidae.

Type
Articles
Information
Geological Magazine , Volume 87 , Issue 1 , February 1950 , pp. 1 - 16
Copyright
Copyright © Cambridge University Press 1950

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