188 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Feb. 21, 



Fig. 1. — General Section of the four subdivisions of the Bunter 



Sandstone. 



Bridgenorth 

 Severn. 



1. Permian sandstone and marl. 



2. Lower, soft, brick-red, and variegated sandstone. 



3. Coarse conglomerate or pebble beds ; pebbles well-rounded. 



4. Upper, brick-red, and variegated sandstone. 



5. White and brown sandstone and red marl, resting on a calcareous conglo- 

 meratic base, succeeded by 



6. New Red marl. 



Some one of these four members lies generally quite unconformably 

 on the Permian beds, unless where they chance to be faulted against 

 each other. 



In the Midland Counties and on the borders of Wales, the Permian 

 section is different from that of Nottinghamshire and the north of 

 England. The magnesian limestones are absent, and the rocks 

 principally consist of alternations of deep red marl and brown and 

 red sandstones, calcareous conglomerates and breccias, which are 

 almost entirely unfossiliferous. The most complete section occurs 

 south of Bridgenorth in the country between Enville and the Forest 

 of Wyre. This ground, as coloured on the maps of the Geological 

 Survey, was mapped by Mr. Aveline and Mr. Hull, the latter of 

 whom supplied me with the following section. 



Fig. 2. — Section of the Permian rocks between Enville and the 



Forest of Wyre. 



s.w. 



N.E. 



Permian. 



Bunter. 



Fault. 

 1. Coal-measures. 



'2. Sandstone and red marls, containing two beds of calcareous con- 

 glomerate, marked X and x'. 

 3. Coarse breccia. 

 _4. Sandstone and red marls. 



5. Lower brick-red oi* variegated sandstone. 



6. Pebble-beds or conglomerate. 



The general dip is easterly, and varies from 2° to 6° ; and the 

 breccia (No. 3) dips distinctly beneath the overlying marls and 

 sandstones. No. 4. On the N.W., various members of the Bunter 

 Sandstone abut on the Perm.ian strata by means of a fault. The 

 same takes place on the East, between Enville and Bewdley ; but in 

 the neighbourhood of Bobbington the inferior brick-red sandstone* 

 rests directly on the higher Permian strata. Nearly the whole of 

 this series is repeated by a North and South fault which intersects the 

 country about two miles to the east of the Severn. It is a down- 

 throw on the West, probably of from 300 to 400 feet. Though dili- 



* No. 5 of the Bunter beds of the above diagram, fig. 2. 



