River-Terraces of the Lower Valley of the Warwickshire Avon

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Abstract
I. Introduction. Since the early part of the 19th century, the gravels which occur in the valley of the Warwickshire Avon have attracted attention. Strickland was one of the earliest workers on these deposits. He made many detailed observations, and recognized two main types of gravel. The high-level deposits which were unfossiliferous, and covered the hills, he considered to be of marine origin, while those occurring in the valley from 20 to 40 feet above the river, and containing mammalian remains and freshwater shells, he believed to be fluviatile (1, p.103). Strickland attempted no further classification of the freshwater deposits; but his work is of great value, in that he carefully collected and identified organic remains from exposures, the position of which he described so accurately that they can be located at the present time almost with certainty. Strickland published lists of these fossils, together with their localities, and these have been extremely helpful in the work covered by this paper. About 1875 a paper was published by T. G. B. Lloyd (3) describing certain additional exposures in these gravels, but otherwise adding little to Strickland's work as regards the Avon river-deposits. Lucy (4) also described some new exposures in the Avon gravels. He states that two terraces containing mammalian remains occur in these valleys, one at 15 to 25 feet and the other at 40 to 50 feet above the present rivers; but he makes no reference to this statement in his subsequent description of the gravels. His paper

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