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Note on Glacial Boulders at Verulamium (St. Albans)

Published online by Cambridge University Press:  01 May 2009

H. G. Mantle
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Extract

During the month of August, 1931, the writer visited the scene of the extensive works at St. Albans, undertaken by the Verulamium Excavation Committee under the directorship of Dr. R. E. Mortimer Wheeler, on the sites of the Roman cities of Verulamium.

Type
Original Articles
Information
Geological Magazine , Volume 70 , Issue 7 , July 1933 , pp. 331 - 334
Copyright
Copyright © Cambridge University Press 1933

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References

page 333 note 1 This erratic of Hertfordshire Pudding-stone was discovered by workmen in the Travellers’ Rest gravel pit, Cambridge, at the end of August, 1925, 12 feet beneath the surface and about 12 to 15 inches from the base of the deposit which rests upon the Gault Clay. It was oval in shape, measuring 38 inches along its principal axis, and stained with peroxide of iron. No stone like it had been seen before; neither is any such rock recorded in Dr. Rastall’s list or mentioned in his paper, nor in the paper of Mr. J. E. A. Whealler, which appeared in the GEOLOGICAL MAGAZINE in 1921. Small boulders of rhombporphyry have been found higher in this pit, 2 feet 6 inches to 3 feet from the base, which would seem to show that the drift carrying this rock was of later date than that which brought the Hertfordshire Pudding-stone.Google Scholar

page 334 note 1 The late Mr. George Barrow, F.G.S., in a paper read before the members of the Geologists’ Association in 1918 (vol. xxx, page 5), cites a case where in the construction of the Rotherhithe Tunnel the engineers came on the taper end of a sarsen, which slowly thickened to about 3 feet, after which it began to contain small scattered flint pebbles; these became more numerous until the rock finally passed into a Pudding-stone.Google Scholar

page 334 note 2 In addition to these types are conglomerates and sandstones belonging to the Bagshot series. These attain as large dimensions as the others and are of common occurrence over the same areas. For example, at the Grove, Stanmore, Middlesex, there is an unusually large collection of these blocks, as also at Stanmer Park and Falmer in Sussex.Google Scholar