UPPER EOCENE (BARTON AND UPPER BAG SHOT FORMATIONS). 611 



bottom of the highly fossiliferous beds, and giving a total of 130 

 feet of Upper Bagshot sand at Tunnel HiU. 



Pig. 9. — Section at Tunnel HiU on the West of Pirhright Common , 

 Surrey J on the east of the railway north of the Tunnel. 



The shaded portions represent dark bands of yellow sand. 

 0. Angular flint-gravel, containing many pebbles. 



Upper Bagshot, 



1. Dark yellow, passing down into ochre-sand, numerous casts of fossils, mostly 



small imivalves, in irony concretions, scattered throughout the bed. 

 About 20 feet. 



2. A well-defined line of bright yellow sand. 8 inches. 



3. Whitish sand. Light yellow sand, passing down into nearly white sand, 



with a line of irregular patches of more ferruginous yellow sand, with lines 

 and concretions full of casts of shells, many large bivalves, Cardiwn 

 porulosum, Protocardium parile, &c. A few flint pebbles. 27 feet. 



4. Alternate bands of dark and light brown and yellow sands, many iron 



sand concretions, but very few fossils. Nearly 40 feet exposed on the 

 north side of the tunnel. Though this is nearly a quarter of a mile long, 

 the bright yellow line 2 and the line of irregular patches in bed 3 are seen 

 at both ends. 

 The base of the fossiliferous beds is shown by the broken line, and is a little 

 above the tops of the telegraph-poles. 



There are several good Upper-Bagshot sections near ISTorth Camp 

 Station, S. "W. E., one on the railway and others at the rifle-ranges 

 (24), from which Mr. Herries has obtained numerous fossils. 



At the southern end of the Pox Hills, near Ash (22), Lieut. 

 Lyons has found the pebble-bed cropping out at a little over the 

 300-feet contour with the Bracklesham and Lower Bagshot Beds 

 below to the north (Q. J. G. S. vol. xlii. p. 413, vol. xliii. p. 435). 



A large outlier of Upper Bagshot is mapped to the north-west of 

 Pirbright, and the northern end of it, on the hills in the ceme- 

 tery close to Brook wood Station, is correctly mapped ; but we doubt 

 whether the Upper Bagshot extends far to the south-east of the 

 station, for at the point marked 25 on our sketch map the pebble- 

 bed crops out, and the Bracklesham greensand comes to the surface 



