180 Reports and Proceedings — Geological Society oj London. 



it from the type-locality at Shrewley over an area of 108 square 

 miles, and finds that it forms a continuous deposit at an horizon 

 between 120 and 160 feet below the base of the Rhsetic. He accepts 

 the view of Murchison & Strickland, that it is the same formation as 

 the Upper Keuper Sandstone of Worcestershire and Gloucestershire, 

 and he also correlates with it the similar deposit at Leicester described 

 by Plant. The formation thus appears to have been laid dowm over 

 an area at least 70 miles in length, and was probably formed, as an 

 episode in the history of the Keuper Marls, by an irruption of the sea 

 into the Keuper Marl area. It represents a phase corresponding 

 to that of the Rhaetic Bone-Bed and the Tea-green Marls, but of 

 somewhat earlier date. 



The associated Keuper Marls have been examined, merely in order 

 to establish their stratigraphical relations with the Arden Sandstone. 

 So far as his observations go, the author is inclined to the view of the 

 older observers that the Marls are aqueous deposits, though possibly 

 containing much wind-borne material, deposited in a shallow lake 

 undergoing strong evaporation and subjected to occasional irruptions 

 of the sea. They represent the closing phase of Triassic ' continental ' 

 conditions in the English Midlands, when the slow subsidence which 

 was soon to bring in marine llhaetic and Liassic deposits was in 

 progress, and produced tliat overlapping of the Keuper rocks on to the 

 higher grounds of the Triassic land-surface which is observable in the 

 neighbouring districts of the Lickey Hills, JS^uneaton, and Charnwood 

 Forest. 



The tectonics of the area are explained by sections and by a con- 

 tour map of tlie upper surface of the Arden Sandstone, which show 

 that, while the beds as a whole are tilted south-eastwards, there are 

 numerous shallow cross-folds with Charnian (north-west to south- 

 east) axes and others with Pennine (north to south) axes. The 

 majority of the faults have a Charnian trend. 



The paper also records three well-borings through the Marls into 

 the Lower Keuper Sandstone. 



2. Fehruartj 7, 1912.— Professor W. W. Watts, Sc.D., LL.D., M.Sc, 

 P.R.S., President, in the Chair. 



The following communication was read : — 



" On an Inlier of Longmyndian and Cambrian at Pedwardine 

 (Herefordshire)." By Arthur Hubert Cox, M.Sc, Ph.D., F.G-.S. 



The inlier in question comprises a strip of country about a mile 

 in length and half a mile in breadth, situated near the border of 

 Herefordshire and Badnorshire, about 15 miles south of Church 

 Stretton. It lies on the well-known north-east and south-west line 

 of dislocation which extends through that town. 



Wenlock and Ludlow Beds occupy most of the area around 

 Pedwardine, but the occurrence of Cambrian Shale yielding 

 Bictyonema has long been known. The Dictyonema Shales dip 

 steeply westwards towards a series of red and green conglomerates 

 and grits, with which an occasional thin shale-band is interbedded. 



