616 Geological Society. 



2. ' The Rhgetic and Contiguous Deposits of Glamorganshire.' 

 By Linsdall Richardson, E.G.S. 



The chief sections in the county are described in detail, the chief 

 being those at Lavernock (near Cardiff), Barry, Tregyff (near 

 Cowbridge), Qnarella (Bridgend), and Stormy Down. The Sully 

 Beds, a name given to the fossiliferous portion of the ' Grey Marls ' 

 of Etheridge, are determined to belong to the Rhaetic Series, on 

 account of the fossils that they contain. They are quite distinct from 

 the ' Tea-Green Marls,' in which fossils have not been observed. Earth- 

 pressures affected the rocks during the formation of the Sully 

 Beds ; the Avicula-contorta black shales rest upon them with perfect 

 parallelism, but even then non-sequentially. Owing to an up- 

 heaval of the Lavernock district early in the age in which the 

 Upper Rhaetic Stage was deposited, only a portion of the lowest 

 bed of that stage is found, and this deposit was subjected to sub- 

 aerial denudation during the accumulation of the remaining Upper 

 Rhaetic beds elsewhere. But subsidence again in the same district 

 allowed of the deposition of the White Lias, and, as a result, this 

 latter rests non-sequentially upon a portion of the lowest part 

 of the Upper Rhaetic deposit. The White Lias, at certain localities 

 in Glamorganshire, contains in abundance Plicatula intusstriata, 

 PI. hettangiensis, and Lima valoniensis. The deposit intervening 

 between the Sun-Bed and the Upper Rhaetic near Bath (Newbridge 

 Hill) is over 11 feet thick ; at Lavernock the equivalent deposit 

 measures but 2 feet 2\ inches. At Lavernock, however, above the 

 probable equivalent of the Sun-Bed, are marls 6 feet 4 inches thick, 

 which are provisionally grouped with the White Lias. Above come 

 the Paper- Shales, succeeded by the Osfrm-Beds. The Upper Rhaetic 

 of North-West Gloucestershire and Worcestershire is not the equiva- 

 lent of the White Lias of this or of the Bath district. The White 

 Lias occurs above the Cotham Marble (the topmost bed of the Upper 

 Rhaetic) and below the Paper-Shales (which occur immediately 

 below the Ostrea-Beds). Palaeontological notes on certain of the 

 fossils are appended, including Ostrea Bristovi, Etheridge MS., 

 which is very abundant in the Sully Beds. 



3. 'On the Occurrence of Rhaetic Bocks at Berrow Hill, near 

 Tewkesbury (Gloucestershire).' By Linsdall Bichardson, E.G.S. 



About 2 miles south-east from Chase-End Hill (Malvern Hills) 

 there is a small outlier of Lower Liassic and Rhaetic beds, in a 

 basin-shaped area, supported and surrounded by Keuper Sand- 

 stone. A detailed section is given, mainly obtained by excavation, 

 and this is compared with the nearest locality where the whole 

 of the Rhaetic may be studied, namely, at Wainlode Cliff. At 

 Berrow Hill rock at the base of the Lower Rhsetic, at least 3| feet 

 thick, is missing; consequently Bed 13 rests directly, and with 

 perfect parallelism (so far as can be seen), but non-sequentially, 

 upon the ' Tea-Green Marls.' 



