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Volcanic pebbles from Pleistocene gravels in Norfolk and Essex

Published online by Cambridge University Press:  01 May 2009

R. W. Hey  and
P. J. Brenchley
R. W. Hey
Affiliation:
Sedgwick Museum, Cambridge
P. J. Brenchley
Affiliation:
Jane Herdman Laboratories of Geology, Brownlow Street, P.O. Box 147, Liverpool
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Summary

In the pre-Anglian Pleistocene of East Anglia and Essex are unfossiliferous gravels with pebbles of flint, quartz, quartzite, chert and volcanic rocks. All appear to belong to the Kesgrave Sands and Gravels of Rose & Allen (1976), which are largely or wholly fluviatile and probably of Beestonian age. Forty-six of the volcanic pebbles, from three different localities, have been examined microscopically. Almost all are fine-grained acid igneous rocks or vitric tuffs, evidently derived from a single suite. Various possible source-areas are considered, of which North Wales, with its Ordovician volcanics, is thought to be the most likely.

Type
Articles
Information
Geological Magazine , Volume 114 , Issue 3 , May 1977 , pp. 219 - 225
Copyright
Copyright © Cambridge University Press 1977

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