xvii. NEAR READING. 445 



ft. 



' White vein ' sand with some ash-coloured clay . . . . -5 



Clay, dark-red, mottled with blue . . . . . ^ . . .6 



Brick-clay light-grey with fine sand 5 



White sand 4 



Fuller's-earth 3 



Sand, quartzose, yellowish 5 



Sand with green earth, chalk flints, green-coated. Ostrea bellovacina, fish-teeth 3 

 Chalk with flints, drilled with tubular holes unknown 



Several of the beds of clay are partially ironshot. 



Since the publication of Dr. Buckland's section of the clays 

 and sands which cover the chalk on the bank of the river at 

 Katesgrove, close to Reading, the excavations have been carried 

 farther into the hill, which in the upper part now shews bands 

 of shells, perhaps forming the basement beds of the London 

 clay. 



In these upper shell beds M. Rofe b found 



Cytherea incrassata. 

 Pectunculus breviformis. 

 Modiola elegans. 

 Dentalium planum. 

 Ampullaria sigaretina. 



And in the oyster bed at the base of the eocene 



Ostrea Bellovacina. 

 pulchra. 

 tener. 



The railway cuttings near Reading furnished good sections, 

 including the sands and mottled clays which lie over the beds 

 already noticed at Theale. One of these at Sonning Hill c presents 

 a considerable thickness. 



ft. in. 



Subangular flint gravel, ochreous, average . . . . 12 o 

 Basement bed of the London clay, fossiliferous brown clay with 



yellow and green sand, pebbles, and septaria . . 5 

 Mottled, bluish, red, and grey clay . * . . ' . .100 

 Sand irregular, yellow or grey . . . . ' . .20 

 Mottled, brown, and blue clay -j 



Dark grey clay > . . . .. * ... . .230 



Mottled, red, and grey clay 



b Geol. Trans., 2nd Series, vol. v. p. 130. 

 Prestwich in Geol. Proceedings, 1853. 



