86 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



At a pit on Liquid Farm, three and a quarter miles E.S.E. of Aid- 

 bourne, and at Hopgrass Pit, one and a half mile W.N.W. of Hun- 

 gerford, isolated masses of the mottled clays are worked, apparently 

 in depressions or hollows on the summit of the chalk hills. In both 

 places the clays are interstratified with thick beds of sand, are ex- 

 tremely irregular in their stratification, and none of the beds contain 

 any fossils. At Wickham, five and a half miles north-west of New- 

 bury, the section of these beds, showing a considerable change from 

 the series at Pebble Hill, which is three and a half miles further 

 south, is tolerably complete. 



[The vertical scale of this and all the following sections, except 

 when mentioned to the contrary, is 50 feet to the inch.^ 



Fig. 2. — Wickham {section from three or four pits in the brick-field). 



1 ^^^^^pi^^^^^p^^^ reet. 



--=^-1^2=^;=^-===-^^--,^^. j_ Gravel of pebbles and subangular flints in 



clay and sand 5 



g. Yellow sands more or less argillaceous ... 15 ? 



f. Mottled black, red and greenish clays 20? 



^J 1^W^^^^^^^^^&' «• Brown and yellow clay and ochreous'sand 5 



^ ■" ' ■^ d. Light yellow sand striped ochreous and 



grey 4 



* c. Very tough greenish grey clay 3 



-r^ b. Grey sand passing down into a fine white 



f ^ sharp sand 12? 



* I a. Light brown clay and green-coated flints 



« s:*.ia3sa:-a^,ss,«s5,a25^ beneath 2? 



---.ii-^,.„--_~=i^_X._ 4_ Chalk* 15 



I have found no fossils in these pits. The lower sand beds are 

 more developed here than at the places before mentioned, being 

 liable to rapid and considerable variations. In some places they are 

 10 to 20 feet thick, and in others not more than 2 or 3. Further, 

 at Newbury, in the half mile of railway cutting, they pass (horizon- 

 tally) from a nearly white colour to apple-green, and then to yellow. 

 The same sands and clays are also worked in pits at Stock Cross and 

 Donnington. 



One (or rather two in adjacent works) of the best sections in this 

 district occurs at Clay Hill, Shaw, one mile E.N.E. of Newbury. 

 With the exception of a small break, the sequence from the London 

 Clay down to the Ciialk is complete. No fossils are met with in the 

 upper part of the Reading series, but in the lower part the bed of 

 Ostrea Bellovacina is extremely well developed, and the shells in a 

 fine state of preservation, although friable. Many of them are very 

 large, as much as 7 or 8 inches in diameter. In the same bed are 

 also found fish-bones, teeth of Lamnce and other fish, a few bones of 

 Chelonia, minute spine of Echinoderm, a few Foraminiferu {Globii- 

 lina), and Cijthere Mulleri. 



* The depth to which the Chalk is penetrated in this and the following sections 

 varies of course from time to time, and is only given approximately. 



