On the Ancient Channel between Caversham and Henley, Oxfordshire, and its contained Flint Implements

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Abstract
The wide depression which cuts across the loop of the Thames from Caversham to Henley and marks the course of a trench partly filled with gravel was constantly under observation by Mr Llewellyn Treacher for a number of years. Together with certain fragments of its possible continuation as far east as Winter Hill, north of Cookham Rise, it forms the subject of the present paper. This ancient channel leaves the Thames Valley at Mapledurham, the middle of its path being marked by Chazey Wood, and passing eastwards between Binfield Heath and Peppard, joins the Thames again at Henley. The Geological Survey maps do not differentiate the deposits which fill it from the plateau gravel generally known as fluvioglacial gravel or Northern Drift. One object of this paper is to show that the channel is not filled with Northern Drift but with a gravel so different that it must have been laid down at a different time and under quite other conditions. A number of years ago Mr Osborne White recognized that an exposure near Blagrave Farm towards the western end of the channel was Thames gravel and in later years suggested that the deposits seen south-west of Henley were contemporaneous with the Silchester stage, that is the highest terrace of the Kennet, which he had so named in 1902 (White, 1895; 1902; 1908, p. 88).

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