256 DK. c. A. MATLEY ON THE [June 19T2, 



Group on my map and sections as a continuous deposit belonging 

 to a single horizon should be stated. It becomes therefore necessary 

 to describe the stratigraphy in some detail, especially as regards 

 those localities where it has not hitherto been recognized. 



In the following description the classification suggested by 

 Brodie (70) will be adopted, the Keuper Marls which lie below the 

 Arden Sandstone Group being designated the Lower Marls and 

 those which lie above that Group the Upper Marls. 



The type-locality for the Sandstone in Warwickshire is the 

 section exposed at the canal at Shrewley Common and in the 

 adjacent disused quarry. This section was first described by 

 Murchison & Strickland in 1837, and subsequently by Brodie on 

 several occasions. According to Brodie's last detailed account (93), 

 26 feet of the sandstone zone is here exposed, consisting of 

 alternating sandstones and green marls, of which 12 feet only is 

 sandstone, the green marls, measuring about 14 feet, mostly lying 

 at the base of the zone. The top of the zone is not exposed in the 

 section, but the base is seen to repose on the Lower Marls. 

 Fossils are not uncommon. The Aerodus Bed and the band with 

 casts of mollusca lie in the marls close to the base. In the 

 sandstones at least one bed is ripple-marked, foot-tracks of 

 labyrinth odonts occur, and sun-cracks, as also other evidences 

 of shore-conditions, are to be found. 



(a) Shrewley to Knowle. 



The base of the zone at Shrewley is about 345 feet O.D., and 

 the beds are horizontal. This horizontalitj^ is maintained for a 

 considerable distance to the north and west of Shrewley, the top 

 of the zone being usually about 10 or 15 feet below the 400-foot 

 contour and only occasionally rising slightlj^ above it. The 

 sandstone can be traced from Shrewley on both sides of the 

 valley formed by the Wroxall Brook, which has cut into the Lower 

 Marls, leaving a low escarpment on each side of the valley capped 

 by the Arden Sandstone. In places it forms flattish terraces, as 

 at Mousley End, and especially at Bowington, where its outcrop 

 forms a lobe extending south-westwards to Finwood and separating 

 the Wroxall Brook valley from that of the Kingswood Brook. 

 The canal cutting through this lobe at Bowington gives a good 

 exposure of the sandstone resting upon the Lower Marls. The 

 sandstones exposed on the north side of the cutting in old quarries 

 are white, sometimes weathering brown, with partings and beds 

 of greenish sandy shale and marl. The sandstones are somewhat 

 false-bedded, with apparent dips to west-north-west varying from 

 5° to 13° ; though, when viewed as a whole from the opposite side 

 of the canal, they are seen to be almost flat. The beds are variable 

 in their composition, as even at Bowington Hall, close by these 

 quarries, the sandstones have become (so I was informed) very shaly. 



To the west of Bowington is a ' through valley ' drained 

 southwards by the Kingswood Brook and northwards by a stream 



