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Stage Names within the Llandovery Series

Published online by Cambridge University Press:  01 May 2009

L. R. M. Cocks ,
P. Toghill  and
A. M. Ziegler
L. R. M. Cocks
Affiliation:
Palaeontology Department, British Museum (Natural History), Cromwell Road, London, S.W.7.
P. Toghill
Affiliation:
Palaeontology Department, British Museum (Natural History), Cromwell Road, London, S.W.7.
A. M. Ziegler
Affiliation:
Department of the Geophysical Sciences, University of Chicago, Illinois 60637, U.S.A.
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Summary

Four stage names are erected within the southern part of the type area of the Llandovery Series, south-east of Llandovery, Carmarthenshire, Wales. They are Rhuddanian, to incorporate the existing Lower Llandovery; Idwian for the Middle Llandovery, and Fronian and Telychian for the Lower and Upper parts of the Upper Llandovery. Correlation with the sequence of graptolite zones is suggested.

The base of the Llandovery at Llandovery is poorly exposed and unfossiliferous, and detailed correlation with other areas may always remain uncertain. Thus the base of the Llandovery Series, and hence the base of the Silurian System, is defined in Lapworth's classic locality at Dobb's Linn, Moffat, Scotland, at the base of the zone of Glyptograptus persculptus.

Type
Articles
Information
Geological Magazine , Volume 107 , Issue 1 , January 1970 , pp. 79 - 87
Copyright
Copyright © Cambridge University Press 1970

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References

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