Geological Society. 481 



ft. in. 



1. Top. Debris of rounded fragments of greensand and 



Portland stone, with their usual fossils, a few inches 

 thick. 



2. Chert, full of Cyclas ; it also contains occasionally 



Bufonites 1 6 



3. Hard, brownish white limestone, with Ostreae and 



casts of other shells, some resembling those of Cy- 

 clas major. The upper layers much disturbed .... 2 



4. Black earthy clay, a few inches. 



5. Purbeck stone, varying in character but containing 



Cyclades 5 



6. Fissile, soft stone full of Modiolse, palates and other 



remains of fishes, also bones of a species of tortoise 1 



7. White limestone, containing Isopods and elytra of 



Coleoptera 3 



Hardstone. 



In an escarpment in the banks of the adjoining river are two beds 

 of limestone, from the upper of which Mr. Brodie obtained small ely- 

 tra, and from the lower Cypris, and from both carbomized wood, also 

 a species of Cyclas. Under these strata is a very oolitic limestone, 

 in which the author found a small Melanopsisand a seed-vessel. 



A mile distant Mr. Brodie procured from a bed of limestone, about 

 five inches thick, Cyclades, Isopods, and a small fish of the species 

 which occurs at Dallards ; and in a bed of clay, bones of a tortoise. 

 The hard crystalline limestone of the Lady-down beds are noticed 

 as yielding, but rarely, Cyclades and Cyprides. In the neighbourhood 

 of Tisbury, in a soft, gritty, slightly oolitic stone, the author found 

 Isopods of a larger size than elsewhere, likewise an elytron of a cole- 

 opterous insect. Though the number of beds of limestone vary in 

 different parts of the Vale of Wardour, yet Isopods and insects cha- 

 racterise the whole of them ; and as respects lithological characters, 

 notwithstanding the great varieties which occur at different localities, 

 there is throughout the district that general peculiarity of aspect which 

 is so remarkable in freshwater formations of very different ages, and 

 which serves to identify detached quarries with each other. 



Vale of Aylesbury. — In Buckinghamshire theWealden beds possess 

 a certain similarity with those in Wiltshire, but with clearly marked 

 local differences. At Quainton Hill Mr. Brodie could not discover 

 any traces of fishes, insects, or Isopods. In a quarry near the village 

 of Stone he obtained the following section : — 



1 . Rubble, several feet. 



2. Hard white stone, no fossils 2 to 3 feet. 



3. Greenish stone, with Cypris 2 feet. 



4. Black clay, containing bones of a Tortoise .... 1 foot. 



5. White and blue limestone (Pendle), yielding Modiolae in abun- 

 dance ; also a few Cypris and Cyclas ; likewise bones and palates 

 of fishes, coprolites, and, but rarely, remains of insects j fragments 

 of carbonized wood are common ; and Mr. Brodie obtained a speci- 

 men of Sphenopteris Mantelli, and another minute but beautiful species 



