ISO Mr. RoFE on the Geology of the Neighbourhood of Reading. 



north or south of the Kennet, even those within thirty yards of its banks, are 

 regulated by the Thames, rising and falling with the river, and not being 

 at all affected by the Kennet floods. This may be accounted for by the 

 Kennet flowing through a bed of tenacious clay, whereas the Thames flows 

 through gravel immediately over the chalk, into which all the wells (except 

 soakage wells) are sunk from ten to twenty feet. The depth of the wells 

 from the surface varies of course according to the situation, some being from 

 ninety to a hundred feet deep, others not more than fifteen to twenty. 



The following is a list of the shells alluded to by Mr. Rofe ; and it appears that the upper bed 

 contains the fossils of the Bognor Rock. 

 The Upper Bed. 



Cytherea incrassata Min. Con. Tab. 155. f. 1, 2. also Bognor. 



Pectunculus brevirostris Tab. 472. f. 1. Ibid. 



Modiola elegans Tab. 9. Ibid. 



Dentalium planum Tab. 79. f. I. Ibid. 



Ampullaria sigaretina • Tab. 284. low. fig. Ibid. 



Katesgrove Oyster-bed. 



Ostrea Bellovacina Min. Con. Tab. 388, f. 1, 2. 



pulcher Tab. 279. 



tener? Tab. 252. f. 2. 



