38o PROCEEDINGS COTTESWOLD CLUB 1912 



Although there may have been an extension of the Severn 

 Estuary as far north as Worcester there is no evidence of a 

 great Post-Cretaceous submergence of the whole of the Plain. 

 A moderate encroachment of the sea would have provided 

 conditions favourable for the existence of marine organisms 

 in those parts of the Lower Severn Valley in which shells have 

 been found, while a considerable submergence would have 

 caused a more frequent intermingling of rocks from either 

 side than is observable in the few instances recorded. 



The following suggestions as to the probable chronological 

 sequence of the various superficial deposits are submitted : — 



A Alluvial silts bordering the streams . . . . . . Post-Glacial 



B The Denmark Road Gravels and Sands . . ■ ■ \ 



C Terrace river-gravels with Drift pebbles and northern f j Glacial 

 erratics . . . . . . . . . . . . • • ( ' 



D The Cheltenham Sands . . . . . . . . . . ) 



E Malvernian and Bunter pebbles, Liassic fossils and j 



Cretaceous flints capping the low hills and scattered ' pj-g.Qiacial 

 over the surface above elevations of about 150 feet 1 

 O.D I 



