BENTONITES IN THE LOWER D BEDS (RYAZANIAN) OF THE SPEETON CLAY OF YORKSHIRE
- 1 March 1978
- journal article
- Published by Geological Society of London in Proceedings of the Yorkshire Geological and Polytechnic Society
- Vol. 42 (1) , 21-27
- https://doi.org/10.1144/pygs.42.1.21
Abstract
SUMMARY: Four volcanogenic mudstone beds totalling 50cm thickness occur in the lower D beds (Ryazanian) of the Speeton Clay in Filey Bay, Yorkshire. These structureless mudstones are composed essentially of smectite or kaolinite, with residual igneous grains suggesting that the clays have originated by alteration of a primary ash fall. Volcanoes of comparable age arc known at Zuidwal in the Netherlands and at the Wolf Rock off Cornwall but it is possible that the Speeton Clay ash was derived from an as yet undiscovered volcanic source.This publication has 11 references indexed in Scilit:
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