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Bedding-faults and Related Minor Structures in the Upper Valentian Rocks near Aberystwyth

Published online by Cambridge University Press:  01 May 2009

H. P. Lewis
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Extract

During recent years much attention has been given to the recognition of rock-structures which have been produced by the slumping and sliding of bedded deposits on the sea-floor during or soon after their accumulation, but as it is often difficult to distinguish between structures so formed and those which are the result of tectonic movements which occurred long subsequent to the deposition and consolidation of the rocks affected, it is my purpose to record certain minor bedding-structures which clearly owe their origin to such later tectonic movements in the hope that structures of this origin may more readily be distinguished from those produced by slumping. It is true that the occurrence of movements parallel to the bedding is suspected to have been widespread, and, among others, Boswell, Cobbold, and Greenly have recorded examples from this country (1937, 1904, 1919), yet, because of the general scarcity of direct evidence whereby the magnitude and frequency of such movements can be proved, it would seem to be of importance to describe the structures when the evidence of their later origin is manifest. It is for this reason, and with a view to supplementing the very little information on this topic usually contained in works on structural geology, that it has been thought advisable to make known some of the details of the minor bedding-structures which are visible in particularly instructive outcrops in the cliffs and on the foreshore of the coast of North Cardiganshire.

Type
Articles
Information
Geological Magazine , Volume 83 , Issue 4 , August 1946 , pp. 153 - 161
Copyright
Copyright © Cambridge University Press 1946

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References

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