On some High-level Gravels in Berkshire and Oxfordshire

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Abstract
I. I ntroduction. A fter the appearance of Buckland's ‘Reliquie Diluvianæ’ the higher gravels of this district were for a time somewhat neglected. Much has now been done in the Geological Survey Memoir by Mr. Whitaker, and in papers by the late Sir J. Prestwich, Messrs. H. W. Monckton, H. J. O. White, A. :E. Salter, and other observers to throw light upon the interesting and difficult questions connected with the later physical history of this part of England. It has been found convenient in the present paper to refer to these gravels as a whole, but to treat more briefly those points which have been already discussed. II. T he P ebble-gravel . This term is used for the deposits, composed very largely of flintpebbles, which are found on the higher slopes of the Chiltern Hills, resting on Lower Tertiary outliers. A familiar example of this gravel is that at Nettlebed, which has been fully described by Sir J. Prestwieh and Mr. White ( op. cit .). It may be seen at various places on the plateau in the neighbourhood of Cadmore End and Lane End, near High Wycombe, by surface-indications; also at Coleshill, near Amersham, at which locality there is a very good section, showing about 5 feet of the gravel, but at a lower level (500 feet above Ordnance-datum). The composition of the gravel will be seen from the following table, which states the percentage of the various stones in the samples examined :— A pebble of chert, from the gravel at Nettlebed, was

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