Surrey Wells and their Teachings. 



47 



Made ground 



Clay (? brick-earth) 



Gravel or ballast 



[London Clay, f Blue clay 

 38i ft.] 



(Basement-bed 



[Woolwich 



and 

 Beading Beds 



48 ft.] 



f Black pebbles 



I Clay with black pebbles 



""Sandy clay and shells 



Mottled clay 



Sand 



Yellow mottled clay 



Mixed pebbles 



Mottled clay and stones 



Green mottled clay and stones 



VMixed sand and shells 



[Thanet Sand, j?^^^^^ ,/; 



about 38f ft.] f ^^<^ and pebbles 



^ ■' V Live sand 



Chalk and flints 



247 3 



There may be some slight error in the figures, as the depth to 

 the Chalk is given as 155 feet, and the total as 250 feet 3 inches. 



Brookwood. — Lunatic Asylum. 1885 ? 



Communicated by Sir F. Bramwell, F.E.S. 



About 150 feet above Ordnance Datum. 



Shaft 186 feet ; the rest a bore of large diameter. 



Large quantities of water found, from 17 feet below the surface, 

 in the beds over the Loudon Clay. A large quantity also met 

 with in the sands from 602 to 634 feet down. 



Water, from the Chalk, has overflowed at the rate of 9 gallons 

 an hour. When the boring was at 784 feet pumping-experiments 

 were tried, and, with the water kept at 25 feet down, the delivery 

 was about 13 gallons an hour : by pumpmg the water down to 

 200 feet the quantity was not quite 300 gallons an hour. 

 Since the boring has been at 884 feet experiments show that, 

 with the water kept at 25 feet down, 15 gallons an hour were 

 got. 



[Bracklesham Beds and Lower Bagshot Sand.J — Sand, 



mixed with marl, shale, and clay about 1714^ 



Clay, with i^yrites, stones (septaria), 



and ijebbles about 372i 



Sandy clay [this may belong to the 



Reading Beds] 22 



'Red clay 17i 



Red sandy clay 7^ 



, J Fine sand 8 



I Red sandy clay 8 



I Coarse red sand 22 



VLoose gi'ey sand 10 



[London Clay, 

 394 ft,] 



[Reading Beds, 

 68 ft.] 



