PRESTWICH WOOLWICH AND READING SERIES. 87 



Clay Hill, Newbury {connected section of two adjoining chalk and 

 clay pits). PL I. Diag. A, Loc. sect. 3. 



Feet. 



111. Brown clay and traces of shells* {London Clay and Basement-bed) 10 



'_;. Mottled red and bluish clay 15 



i. White sand 1 



h. Mottled clay 10 



g. Sands and loam, only partly exposed 10? 



f. Light-colonred and ochreous sand, laminated 3 



e. Laminated dark grey clay, grey and green sand, and a few pebblesf. 8 



d. Ditto, w'ltYi Ostrea Bellovaeina 1 



c. Dark grey clay mixed with green sand: no oysters 2 



b. Dark grey clay mixed with green sand, oysters, teeth, &c. : pebbly... 1 

 a. Dark grey clay mixed with green sand, pebbles, and a few unrolled 



flints , 1 



62 

 Chalk, with tubular surface-perforations filled with green sand 20 



In this part of Berkshire the mottled clays preponderate on the 

 south side of the Tertiary area, whilst on the northern outcrop the 

 sands are more largely developed. This latter is especially the case at 

 Courage and Oare, a few miles northward of Newbury. 



At Red Hill, seven and a half miles west of Reading, the section 

 is as follows : — 



Red Hill (pit in hrich-field) . PI. I. Diag. A, Loc. sect. 4. 



Feet. 

 e Red and purple clay passing down into red and green mottled, and 



then red alone 20 



d. Patch of angular chalk fragments, subangular flints, and flint-pebbles 1 



c. Mottled red and yellow sand 0^ 



Xb. Light-coloured sand 6? 



Ti\ 

 The peculiarity of this section is the occurrence of a patch of an- 

 gular chalk fragments and flints, resembling ordinary gravel, beneath 

 the main mass of mottled clay §. I found no organic remains in this 

 place. At Sulham near Pangbourne the sands overlying the chalk 

 are more than 20 feet thick. At Rose Hill, and again at Woodcot 

 Common, to the north of Reading, there is a considerable outlier of 

 unfossiliferous mottled clays and sands. The section at Katesgrove 

 pit, Reading, is well known from the description of Dr. Buckland ||, 

 who noticed also the rapid change by which, on the opposite side of the 



* These were first noticed by Mr. Rupert Jones. f I have recently 



found traces of fossils in this bed which require further examination. 



X The letters aSixed to the different beds of the Woolwich and Reading Series 

 in the several sections do not mark equivalent strata, with the exception of " a," 

 which is always confined to the commencing or lowest bed of the series. Where 

 the letters begin further on in the alphabet, it is merely to indicate that the series 

 is not complete — that some of the lower beds are wanting. 



§ In digging a well at Bradfield, between this spot and Reading, the mottled 

 clays are said to have been above 130 feet thick ; but this seems to me doubtful. 



II Trans. Geol. Soc. 2 ser. vol. iv. p. 276. Since the period of Dr. Buckland's 

 visit, the " Basement Bed of the London Clay " with its well-characterized fossils 

 has been exposed by the extension of the pit further into the hill. (See Rolfe 

 in Trans. Geol. Soc. 2nd ser. vol. v. p. 127.) 



