Tol. 68.] AEDEN SANDSTONE GROUP OE WARWICKSHIRE. 265 



Rock-salt occurs in these Lower Marls in Worcestershire, but has 

 never been met with, so far as I am aware, in Warwickshire, 

 although there is evidence of the crystallization of salt during the 

 formation of these Lower Marls in the pseudomorphs of sodium- 

 chloride that have been obtained at several localities east of 

 Birmingham and at Maxstoke. Ripple-marked skerry-bands 

 are also found in them at Bordesley and Yardley near Birmingham 

 and elsewhere. 



The Rhsetic Beds of this district have been examined merely 

 for the purpose of inserting on the map their boundary with the 

 Keuper rocks. The Copt Heath outlier, between Solihull and 

 Knowle, is obscured by drift-gravel in the direction of Solihull, 

 and I have reduced the length of the outlier as shown on the 

 Survey map by about half a mile in that direction, as I found no 

 evidence of E-hsetic or Lower Lias being present west of Longdon 

 Hall. On the other hand, there is a possibility of the extension 

 of these beds to the east of the boundary as mapped, as green 

 marl (which appears to be the ' Tea-Green Marl ' zone of the 

 highest Keuper) was found in' drain-excavations at Hob Lane, 

 Barston ; and fragments of Bhaetic shales, and of Bhsetic or Liassic 

 limestone, occur lower down the lane and in the fields to the south 

 and south-east of Barston Church.^ The evidence at present is, 

 however, by no means strong enough for asserting the occurrence of 

 Bhsetic deposits in situ here ; and as I have left part of the area 

 about Barston unmapped, I call attention to the point in the hope 

 that it will be cleared up by local geologists. If present, the beds 

 dip southwards, and a fault probably intervenes between them and 

 the Arden Sandstone which occurs at Barston Park Farm near by. 



The Morton Bagot and Stooper's Wood outliers have been mapped 

 with their boundaries much as drawn by the officers of the 

 Geological Survey. The same remark applies also to the boundary 

 of the main outcrop of Bhaetic and Lower Lias, except (a) that I 

 show a faulted boundary at Aston Grove, and (b) that it seems to 

 me that the plateau bounded by an Upper Keuper Marl escarpment 

 between Lower Clopton and Lower Ingon, near Snitterfield, is 

 perhaps covered by a thin layer of Bhsetic. J^o definite exposures 

 have been observed in this area where there is much drift ; but the 

 nature of the soil suggests this opinion, an opinion strengthened by 

 the fact, of which I was unaware at the time of mapping, that 

 Bhaetic shales were actually discovered below the drift in making 

 excavations for the Snitterfield reservoir, and were described by 

 the Bev. P. B. Brodie (86 & 88). 



^ [Dr. F. L. Kitchin has been good enough to examine the fossils extracted 

 from pieces of limestone obtained from this neighbourhood. Ostrea liassica 

 StricM., Lhna (Flagiostoma) gigantea J. Sow., and Cardinia sp. are repre- 

 sented by several examples. Modiola minima J. Sow., M. minima auctfc. non 

 J. Sow., and radioles of Cidaris a£f. edwardsi Wright, also occur. Dr. Kitchin 

 regai'ds them as of Lower Liassic age, probably from the Ostrea Beds or 

 the Planorbis Beds, or perhaps from both. There is no evidence for Rhagtic 

 among them. With his views I quite agree. — C. A. M., May 15th, 1912.'] 



