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VI.—An Outlier of Upper Bagshot Sands on London Clay

Published online by Cambridge University Press:  01 May 2009

A. Irving
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Extract

The chief object of this paper is to describe an unmapped outlier of Bagshot Sand, inwhich the pebble-bed, frequently met with at this level, exhibits an extraordinary thickness and compactness. It is situated at Bearwood, on the estate of John Walter, Esq., who has kindly given me every facility for investigating it. The extent of the outlier may be said to coincide approximately with the space enclosed within the 250 foot contour-line of the Six-Inch Ordnance Survey Map.

Type
Original Articles
Information
Geological Magazine , Volume 4 , Issue 3 , March 1887 , pp. 111 - 116
Copyright
Copyright © Cambridge University Press 1887

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References

page 111 note 1 See Proceedings of Geol. Assoc., vol. viii. pp. 149–151;Google ScholarQ.J.G.S., vol. xli. (08. 1885), p. 508;Google ScholarProc. Geol. Assoc. vol. ix. pp. 219, 223, 224.Google Scholar

page 112 note 1 Proved depth 256 feet. See Mem. Geol. Survey, vol. iv. p. 423. Compare my paperinGEOL. MAG. for 09, 1886.Google Scholar

page 113 note 1 Bed No. 4 of my section, Q.J.G.S. 04, 1885.Google Scholar

page 114 note 1 I am not sure that they are notinreality, inboth cases, parts of a later drift.

page 115 note 1 See Proc. Geol. Assoc. vol. viii. pp. 153–160.Google Scholar

page 115 note 2 A very similar case of a massive pebble-bed at the base of the Bracklesham Series, and resting upon London Clay, has been recently mentioned in a letter to the author by Mr. Whitaker, as occurring in the Hampshire Basin. No authenticated instance of a bed of pebblesinundoubted Lower Bagshot Sands has yet been recordedinthis western part of the London Basin, while those in Essex may for very good reasons be assigned to a higher horizon. (See Whitaker, , Geol. of London, p. 52.)Google Scholar