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The Zonal Nomenclature of the Upper Kimmeridge Clay

Published online by Cambridge University Press:  01 May 2009

E. Neaverson
E. Neaverson
Affiliation:
Lecturer in Palæontology in the University of Liverpool.
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Extract

Previous to the year 1913 the English Kimmeridge Clay was divided into two zones only, which were believed tq be “intimately blended”. In 1913 Dr. H. Salfeld instituted a more detailed subdivision of eleven zones, the upper three of which constitute the Upper Kimmeridge Clay as since defined by Dr. F. L. Kitchin. Salfeld's sequence of zones was emended in 1922 by Messrs. Chatwin and Pringle, who showed that at Swindon the zone of Pectinatites pectinatus (Phill.) occurs below the Swindon Clay, and not above it, as Salfeld had supposed. In the early part of last year Mr. S. S. Buckman also presented a similar scheme of zones, and subdivided Salfeld's zone of P. pectinatus, which he placed in the Lower Portland, as in Salfeld's original scheme.

Type
Original Articles
Information
Geological Magazine , Volume 61 , Issue 4 , April 1924 , pp. 145 - 151
Copyright
Copyright © Cambridge University Press 1924

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References

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page 145 note 4 Chatwin, C. P. and Pringle, J., “The Zones of the Kimmeridge and Portland Rocks at Swindon” Summary of Progress Geol. Surv. for 1921, p. 162: Mem. Geol. Surv., 1922.Google Scholar

page 145 note 5 Buckman, S. S., Type Ammonites, vol. iv, 1923, pp. 29, 33.Google Scholar

page 146 note 1 Buckman, S. S., Type Ammonites, vol. iv, 1923, p. 33.Google Scholar

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page 147 note 4 Information from Mr. J. Pringle.

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