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The Middle Devonian Marine Transgression in North Devon and West Somerset

Published online by Cambridge University Press:  01 May 2009

B. D. Webby
B. D. Webby
Affiliation:
Department of Geology and Geophysics, The University of Sydney, Sydney, N.S.W., Australia.
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Abstract

The lithological and faunal changes through the transition from non-marine Hangman Grits to marine Ilfracombe Beds of North Devon and West Somerset suggest the presence of a major depositional marine transgression. A fauna of thick-shelled lamellibranchs and gastropods occurs in beds lying stratigraphically between the flu-viatile Hangman deposits below, and the shallow-water marine Ilfracombe Beds above, and is considered to indicate an intermediate phase of intertidal depositional conditions. The transgression appears to have advanced across the region in a north-north-easterly direction during Lower-Middle Givetian times following coastal subsidence and possibly an associated rise of sea level.

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Articles
Information
Geological Magazine , Volume 102 , Issue 6 , December 1965, pp. 478 - 488
Copyright
Copyright © Cambridge University Press 1965

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