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Volcanic pebbles in Pleistocene gravels of the Thames in Buckinghamshire and Hertfordshire

Published online by Cambridge University Press:  01 May 2009

C. P. Green ,
R. W. Hey  and
D. F. M. McGregor
C. P. Green
Affiliation:
Department of Geography, Bedford College, Regent's Park, London NW1 4NS
R. W. Hey
Affiliation:
Department of Geology, Sedgwick Museum, Downing Street, Cambridge CB2 3EQ
D. F. M. McGregor
Affiliation:
Department of Geography, Bedford College, Regent's Park, London NW1 4NS
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Summary

The incidence of volcanic pebbles in the gravels of the middle Thames basin is noted. The detailed petrography of volcanic clasts at two sites is described and found to be broadly similar to that of material from sites in East Anglia, thought to be of Welsh origin. The frequency of volcanic pebbles in the two areas is also similar. This evidence suggests that volcanic material was brought into East Anglia via the ancestral Thames.Records of volcanic rocks in the drift deposits of the upper Thames basin provide additional evidence of this route.

Type
Articles
Information
Geological Magazine , Volume 117 , Issue 1 , January 1980 , pp. 59 - 64
Copyright
Copyright © Cambridge University Press 1980

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