of the liagshot beds of the london basin. 171 



Towards the West. — Finchampstead, Bearwood, and 

 Farley Hills. 



Finchampstead Ridges. — All doubt as to the capping of these 

 hills by Upper Bagshot Sands (see Mem. Geol. Surv. vol. iv. 

 p. 335) is now removed. The highest points of the hill are 

 respectively 333' and 336' O.D. There is, as usual, a heavy 

 capping of plateau-gravel for which we may allow from 12 to 16 

 feet. 



The sands are, or have been quite recently, exposed — (1) In a 

 new road-cutting at North Court (glauconitic sand filling old 

 root-stock holes in the uppermost bed)* ; (2) in excavations for 

 building at Sunnyside (300' O.D.) ; (3) beneath the gravels in 

 the pits ; (4) in the churchyard at Finchampstead, and in a 

 sand- hole and road-cutting close by ; (5) in excavations on Pie 

 Hill ; (6) in the lane below Eidge Farm. The sands are quite 

 30 feet thick in the Church Hill, the highest point of which is 

 330' O.D., with little or no gravel. In the eastern part of The 

 Eidges they probably reach a thickness of 50 or 60 feet. There 

 is a slight dip (about 1 in 340) in these hills towards the College 

 Well, as found by a comparison of the levels of the base of the 

 Upper Sands under Finchampstead Church, and of the pebble-bed, 

 of which there are strong signs at the top of the clay in the 

 ditches by the side of the road which runs from the Station to 

 the top of the hill at the eastern end. 



The outcrop of the beds of the Middle Group (pebble-beds, 

 clays, and green earths) is to be observed in many places around 

 their flanks. Following Barkham Eide, which runs K.W. along 

 the flank of the hill from the Wellington Hotel, we find, as we 

 should expect from the section in the railway-cutting and the 

 well behind the hotel (see my former paper), the green earths of 

 Nos. 7 and 8 cut into by the first line of erosion. The rise of 

 the road takes us over the base of the upper sands, when we 

 come to — 



Section 0. Middle Bagshot Strata at Heath Pool. 



feet. 



a. Stiff clay (more sandy in places) (No. 5) 6 (250' O.D.) 



b. Pebble-bed (No. 6) ^ 



c. Green earthy sands and clays (Nos. 7 and 8), ex- ] 



posed in the side of the lake last summer, also in I 20 

 ditch- and road-sections below J 



Total exposure 26^ 



The mixed sands and clays (Nos. 9 and 10) crop out from under 

 c a little further on, are continued along the road, then pass 



* Probably for a long time the bottom of a post-Eocene marsh or shallovr 

 lake. 



n2 



