Abstract
I. Introduction The field-work on which this paper is based was mainly carried out between 1895 and 1901, at a time when I lived near Birmingham. It was then suspended, owing to my removal from the district, and until 1911 I was unable to revisit the ground and advance the mapping sufficiently for the presentation of this paper. Even now I have been compelled to curtail considerably my original plan of work, which was to zone the Keuper Marls of Warwickshire from base to summit as far as possible, and, when that was accomplished, to investigate their lithology and fossils with the view of ascertaining their origin and mode of formation. The present paper deals mainly with the stratigraphy, tectonics, and geological relations of a well-marked horizon in the Marls which is usually known as the ‘Upper Keuper Sandstone,’ and further work on the Marls of this area must be left to other workers. II. General Description of the District. The portion of Warwickshire to he described extends from the neighbourhood of Solihull, Knowle, and Barston on the north to Wilmcote and Snitterfield, near Stratford-on-Avon, on the south; and from Tanworth-in-Arden, the Alne Hills, and Wixford on the west to Hatton and Claverdon on the east, an area of about 108 square miles. The Keuper Marls occupy the whole of this district, except where they are overlain in the south by the Rhætic and Lower Lias, and in the north, near Knowle, by an outlier of the same formations. Geologically

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