494 



REV. A. lETl^TG 0]!T A GEIfEEAL SECTIO^^ OF THE 



ITppee BAGSHOT J 

 (23 feet) 1 



MrDDLE Bagshot 

 (76 feet) 



Fig. 1. — Vertical Section of Bagshot Strata disclose d in the Trials 

 boring for the Deep Well at Wellington College. (Scale 40 feet 

 = 1 inch.) 



285 feet above Ordnance datum-line. 

 Stirfaee-drift enclosing angular flints (1 foot). 

 Bnff-coloured sand (Upper Bagshot) (12 feet). 



G-rey sand -with, dark olive-green and black grains (10 

 feet) (rather exceptional at this horizon). 



Well-worn pebbles of black flint in sand (1 foot). 



Buff-coloured sand and loam (6 feet) (scattered green 

 and black grains and pipe-clay). 



Drab-coloured^ sandy clay (9 feet), in some sections 

 laminated. 



Well-rolled pebbles of black flint in sand (3 feet). 



LOWEEsBAGSHOT 

 (about 120 feet) ■{ 



LoKDON Clay, 



Green sand, yielding some water at the^ bottom > 31 

 feet). 



Sand^of a dark green tint (Tfeet). Much water. 

 Fine clay, in part a pure pipe-clay (6 feet). 



Continuation of the next above but of darker shade 

 (14 feet). 



Sand (grey ),= with olive-green grains (46 feet). This is 

 ^simply a dirty quartzose sand. 



Continuation of the above, with rather more oxidized 

 iron on the grains (46 feet). 



Indurated arenaceous^clay stained with carbon (3 feet). 



Blackened marl and clay l amin ated in its upper 

 portion (35 feet). 



JN'OTE.— To the 23 feet of Upper Bagshot Sands, 

 shown in this section, we must add another 100 feet 

 and more for the total thickness of these sands as they 

 exist at present elsewhere in the district. The neigh- 

 bouring hills, on which the Cruninal Lunatic Asylum 

 is situated, reach a height of 400 feet, and the continu- 

 ation of the beds of the upper portion of this section 

 beneath those hills is proved in numerous well-sections 

 in the village of Crowthorne. We must have, there- 

 fore, a thickness of about 140 feet of Upper Bagshot 

 Sands preserved in this neighbourhood. 



