242 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Jail. 9, 



Section of Leckhampton Hill, on the scale of \BOfeet = l inch. 





Devil' 

 Chimney. 

 Road. ^.^^"^ — - 7 



feet. in. 



7 6 

 

 



1. Trigonia grit 7 



2. Gryphite grit 7 



3. Rubbly oolite, with many fossils 24 



4. Fragmentary oolitic freestone, apparently unfossili- 



ferous 26 



5 . Oolite marl with Terebratula fimbria 17 



6. Freestone, quarried for building, with shelly layers at 



irregular inters'als, the thickest and more fossUi- 

 ferous portions at the base 106 



7. Pisolite ("Pea-grit") and femiginous ooUte (" Be- 



lemnite bed ") and sand* 42 



8. Upper lias, about 180 



9. Marlstone, about 50 



10. Lower has (probably 600 feet thick) 519 



Inf. Oolite, 

 230 ft. 



Lias, 

 749 ft. 



Total height above the sea 978 



From the above it will be observed, that the Has forms the main 

 portion of the outer escai-pments of the Cotswolds, being nearly 750 

 feet thick, while beds resting upon it, and probably forming nearly 

 the entire series of the inferior oolite, do not amount to more than 

 230 feet. 



In tracing the course of the inferior oolite on the south and south- 

 west, the lower beds will be found to undergo considerable changes 

 of mineral structure, and occasionally in fossil contents. Thus at 

 Painswick Hill near Gloucester, the lowest stratum seen on the north- 

 western face resembles a similar band at Frocester, about to be de- 

 scribed, and contains a variety of fossils. Ascending the hill on the 

 north-east, the Trigonia and Gryphite grits are well-defined, and 

 abound in fossils, among which Gryphcea cymhiujn, Lima probosci- 

 dea, Pecten, Gervillia, &c. are most frequent. The Trigonia grit is 

 much thicker than at Leckhampton, although in both localities it is 

 a close-grained, hard, shelly stone, of a light -brown colour, loaded 

 with a large species of Cucullcea, Gervillia, Modiola, Pecten, and 

 other shells. Towards the town of Pains^^-ick the "freestone" is ex- 

 tensively quarried for several economical purposes, and altogether 

 approximates closely in character to its equivalent at Leckhampton, 

 though there seem to be fewer shelly layers, and these much less 

 rich in the remains of molluscous animals. Passing on in a more 

 southerly direction, to Selsley Hill, close to Stroud, a remarkable va- 

 riation takes place in some of the members of the inferior oolite, the 



* I hope in a future communication to give a more detailed account of the 

 beds below the freestone, the lowest of which, as they approach the lias, present 

 some new and interesting characters. 



