560 KEY. A. IKYING ON THE PLATEAU-GRAYELS 



5'oungest deposits of the series ; for I conceiYe that the series as a 

 whole covers a very large interval of geologic time, perhaps the 

 whole of the Pliocene Period, the oldest of them (on Caesar's Camp 

 and Hungry Hill, Aldershot) being possibl}- of very early Pliocene 

 age. On the other hand, the patches of unstratified and angular 

 gravel found on the higher slopes and minor bluff's of the present 

 valleys are probably mere " run-of-the-hill " of the later denudation 

 of the country, and do not necessitate the idea of glacial action. 



Localities furnisliing Sections of the Plateau-gravels. 



Locality. County. Above o.d. 



feet. 



C.Tesar's Camp and Hungry Hill (Aldershot) Hants. 500 to 600 



Hook Wood (north of Netley Heath) * Surrey. 500 to 600 



Fox Hills „ 350to400 



Frimley Eidges ,, 400 



Bagshot Orphan-Asvluui t „ 400 



Obelisk Hill (Camberley) ,, 370 



Crawley Hill (Camberley) „ 350 



Long Down (Sandhurst) Berks. 350 



Edgeburrow (Sandhurst) „ 370 



Broadmoor ,, 400 



Caesar's Camp :]: (Eastharapstead) ,, 400 



WagbuUock Hill (Easthampstead) + , 400 



G-ravel Hill (Swinley) + „ 400 



Finchampsteacl Ridges § „ 330 



Tower Hill (Swinley) „ 350 



Eace-Course Hill (Ascot) „ 300+ 



Long Hill (Ascot) „ 300 + 



Chevy Down (Ascot) „ 300+ 



Goathurst Hill (Ascot) „ 320 



Buckhurst Hill || „ 300+ 



Farley Hill (S. of Eeading) „ 280 



Bearwood^ „ 280 



The whole of Easthampstead Plain and Chobham Eidges is probably 

 capped with the same sort of gravels as are exposed at the localities 

 mentioned. 



In nearly all the sections the stratification is clear, and in most 

 cases as pronounced as it is in the Low-level Gravels of the present 

 Valley of the Thames, at Reading, at Ealing, and at Kensington ; a 

 fact which seems to point clearly to their river-origin. They are 

 totally destitute of organic remains, except such as have been 

 brought in the flints from the Chalk (impressions of fragments, 

 spines, and occasionally complete casts, of Micrastei% Galerites, 

 AnancJiytes, Pecten, Inoceramus, &c.), or as Sponge-spicules from the 



* Flint pebbles and coarse unworn flint debris, interstratified with a stiff 

 loam. 



t Nine feet of gravel proved in the well-section (see ' Mem. of tlie Geol. 

 Survey,' vol. iv. p. 537). 



I Three great spurs at the north end of Easthampstead Plain. Open gravel- 

 pits may be seen on each of these hills. 



§ Three extensive pits worked for gravel. 



II This gravel extends some distance to the north in the direction of Binfield. 

 ^ See Geol. Mag. dec. lii. voh iv. pp. 112, 115. 



