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III.—Note on the Structure of the Ightham Stone
Published online by Cambridge University Press: 01 May 2009
Extract
Some time since a student of University College, Mr. J. Hale, of Ivy Hatch, brought to me specimens of an extremely hard green sandstone, which he informed me came from the Folkestone Sand stage near Ightham, in Kent. As the microscopic structure proved rather interesting, I lately visited the locality in his company, and had the additional advantage of being conducted by Mr. B. Harrison, of Ightham, so well known for his discoveries of palaeolithic implements and for his minute knowledge of the geology of the neighbourhood.
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page 297 note 1 Mr. Harrison informs me it is about 140 feet above the top of the Kentish Rag.
page 298 note 1 Mr. Harrison informs me that when the rock was extensively worked for the Metropolitan roads, some half-century since, it always occurred in detached masses, so that the opener of a pit might get sometimes nothing, sometimes a rich return, for his pains.
page 298 note 2 The surface of the ground at the Camp is from about 500 to 600 feet, of the Gault about 300 feet above the sea.
page 299 note 1 From their position in the scarped face of the sand, they could not he reached for measurement without an amount of trouble that would have been wasted.
page 300 note 1 I have to thank Dr. G. J. Hinde for specimens for comparison. The genera Pseudodiadema and Peltastes seem to be most common in the Upper Neocomian rocks of England. So far as I can judge, I should refer these spines to the former genus.
page 300 note 2 Fifth Annual Report of the U.S. Geol. Survey, plate xxii.