270 NOTE ON A DERIVED BOULDER AT WARDEN POINT By A. G. DAVIS, F.G.S. [Received 9 July 1951) IN June 1949 a boulder of non-calcareous buff-co1oured quartzitic sandstone, measuring roughly nine by four inches, was found at the foot of the cliff. The surfaces were irregular and slightly waterworn and its appearance showed that it had not been in contact with the present tides nor entombed in the London Clay. It was packed with molluscan casts-Cyrena cuneiformis, Cyrena sp. (large form) and Brotia inquinata, forms characteristic of the Woolwich and Blackheath Beds. These species are notably absent from the Old- haven Beds at Herne Bay but are known at Upnor and from the ironstones of Blean (Oldhaven Beds). The lithology is, however, unlike any known in Kent but may be regarded as similar to the shelly sandstone (?Oldhaven Beds) dredged from Harwich Harbour. Immediately above the site, where the boulder was found, are some small pockets of Bagshot pebbles and it is reasonable to suppose that it had fallen from one of these.

Note on a derived boulder at warden point

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270

NOTE ON A DERIVED BOULDER AT WARDENPOINT

By A. G. DAVIS, F.G.S.

[Received 9 July 1951)

IN June 1949 a boulder of non-calcareous buff-co1oured quartziticsandstone, measuring roughly nine by four inches, was found

at the foot of the cliff. The surfaces were irregular and slightly waterworn and its appearance showed that it had not been in contact withthe present tides nor entombed in the London Clay. It was packedwith molluscan casts-Cyrena cuneiformis, Cyrena sp. (large form)and Brotia inquinata, forms characteristic of the Woolwich andBlackheath Beds. These species are notably absent from the Oldhaven Beds at Herne Bay but are known at Upnor and from theironstones of Blean (Oldhaven Beds). The lithology is, however,unlike any known in Kent but may be regarded as similar to theshelly sandstone (?Oldhaven Beds) dredged from Harwich Harbour.Immediately above the site, where the boulder was found, are somesmall pockets of Bagshot pebbles and it is reasonable to suppose thatit had fallen from one of these.