412 



MESSES. E. ^y. MOXCXTON AND R. S. HEEBIES 



then Middle Bagshot, and above that Upper Bagshot sands with 

 a capping of gravel ; and Eedan Hill and the valley between the 

 two we believe to be wholly Lower Bagshot, except for the cap of 

 gravel already alluded to. 



The annexed diagram (fig. 3) represents our reading. 



Fig. 8. — Section across the Valley of Aldershot Town. 

 (Not drawn to scale.) 



s.s.w. 



Eedan 



Hill. 



N.N.E. 

 Thorn Hill. 





1. Gravel (angular flints). 



2. Upper Bagshot (sands). 



3. Middle Bagshot (rolled pebbles). 



4. Lower Bagshot (false-bedded sands). 



5. London Clay. 



If we have established this, the section in the brickfield on the 

 south side of the town, west of the railway, described by Mr. Irving 

 (loc. cit. p. 501) is easily explained. Here the junction of the 

 London Clay and overlying Bagshots is exposed. The Bagshot beds 

 consist of about 14 feet of yellow and brownish-yellow sands, with 

 numerous seams of pipe-clay and many ferruginous concretions, 

 which are especially large and numerous near the base, and they 

 rest on dark-blue London Clay. 



Here we find no pebbles or green sand, and the beds are apparently 

 horizontal; and on the whole there does not seem to us any 

 sufficient ground for saying that there is an unconformity. 



Mr. Irving contends that the Bagshot beds here belong to the 

 Middle series, and correspond to the loamy beds with pebbles 

 described by him as occurring at the base of the Hedan-Hill cutting. 

 We agree that they are on about the horizon of the beds at the base 

 of that cutting, which, owing to the thickness of the overlying 

 sands, must be nearly at the base of the Bagshots ; and we therefore 

 consider them to be the lowest beds of the Lower Bagshot *. The 

 loamy bed of Eedan Hill is probably, like the beds in the brickfield, 



* {Note, July 21). — Since this paper has been in the press, we have found 

 that there is a sand-pit in the side of the hill above the brickfield which con- 

 firms this view. It is an ahnost exact repetition of the sand-pit in Eedan 

 Hill— 20 or 30 feet of false-bedded reddish and white sands with pipe-clay 

 seams and ferruginous partings. 



