610 MESSES. GAEDNEB, KEEPING, AND MONCKTON ON THE 



cutting at Crawley Hill*. Mr. Herries has found similar casts on 

 the Lightwater Eoad, near Windmill Hill t. 



All these fossils are from beds more than 100 feet above the 

 Bracklesham. 



There are several good sections in the lower beds of the Upper 

 Bagshot in this district, mapped as Bracklesham. There are two 

 large sand-pits at IS'ew England HiU (16) (close to " three Barrows " 

 on the Survey Map), 2J miles east of the road running along 

 the top of Chobham Eidges, and the pebble-bed crops out at the 

 Gordon Boys' Home, a little below the level of the pits. It again 

 occurs at Bisley (17), and there are two fine Upper Bagshot sections 

 close to Cowshot Manor (18), and several small ones at the Guards' 

 Camp, Pirbright. 



We therefore believe that not only the high ground of Chobham 

 Eidges, but also the low hills between Cowshot Manor and 'New 

 England Hill and the boggy ground covered with heath between 

 them and the Eidges, form part of the main mass of the Upper Bag- 

 shot. 



There is a small outlier of Upper Bagshot close to Knap-Hill 

 Asylum, and pebbles from the Upper Bagshot basement-bed are 

 found at the top of many of the hills around, possibly, in some 

 instances, they may be in situ. 



Professor Prestwich obtained the greater number of his Upper 

 Bagshot fossils from the railway- cutting on the main line of the 

 South-western Eailway through the northern end of the Fox Hills 

 (19) (see list, Quart. Journ. Geol. Soc. iii. p. 393),and there are two 

 in Mr. Herries's collection from a pit (20) close to the ruined wind- 

 mill on the top of the hill. One, a Tellina, was in a red, hard 

 sand, just below the gravel which caps the hill. 



At about the middle of the Eox Hills there is a fine series of 

 sections on the Woking- Aldershot Une. The railway tunnels under 

 the highest part of this ridge, known as Tunnel Hill ; but at each 

 end are deep cuttings, giving the following section (21, and fig. 9). 

 The fossils in beds 1, 2, and 3 can, in many cases, be named with 

 certainty. The list is given on page 616. 



The Upper Bagshot extends considerably beyond the limit shown 

 in the map, probably as low as the 200-feet contour on the east of 

 Tunnel HiU. To the west there is a small sand-pit in Upper Bag- 

 shot yellow sand, close to Mitchet Lake (23), at the level of about 

 237 feet above 0. D. 



The strata under Tunnel HiU appear to have a slight dip to the 

 north, so that the level of the pebble-bed under the hiU must be under 

 237 feet above ordnance datum, i. e. from 70 to 80 feet below the 



* Described Mem. Greol. Surv. iv. p. 334. The shells are Terebellum fiisi- 

 forme-, Voluta, sp. ; Natica, sp. ; Tarritella imbricataria ; Trochita aperta; 

 Xenophora umbilicaris ; and two other species of univalves ; Trotocardium, sp. ; 

 Cardita sulcata ? ; Tellina scalarioides ; Corhula, sp. ; two other species of 

 bivalves and Serpida. 



t Geol. Mag. dec. 2, vol. viii. p. 171. Those from the latter are Turritella 

 imbricataria, Ostrea, sp., and three bivalves. 



