252 DR. C. A. MATLET ON THE [JuDG I912, 



13. The Upper Keupee (or Arden) Sandstone GRorp and Associated 

 Rocks 0/ Warwice:shire. By Charles Alfred Matlet, D.Sc, 

 F.G.S. (Read January 24th, 1912.) 



[Plate XVIII— Map.] 



Contexts. 



Page 



I. Introduction 252 



II. Greneral Description of the District 252 



III. History of Previous Eesearches 254 



IV. Stratigra])! I J of the j^rden Sandstone Group 255 



V. The Upper and Lower Keuper Marls and the 



RbffiticBeds 264 



VI. Lithology and Fossils of the Arden Sandstone 



Group and its Position in the Marls 266 



VII. Correlation with other Ai-eas, and Conditions of 



Deposition 267 



VIII. Tectonics of the Area 268 



IX. Deep Borings through the Keuper Marls 271 



X. Summary 276 



XI. Bibliography 276 



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 considerabh' 

 my original plan of work, which was to zone the Keuper Marls of 

 AVarwickshire 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 stratigraph}^, 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 AYarwickshire to be 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 



^ I desire gratefully to acknowledge two grants made about 1896 and 1897 

 from the Endowment of Eeseai'ch Fund of tbe Birmingham Natural History 

 & Philosophical Society in aid of this work, and to express regret at the 

 belated pubhcatiou of the results. 



