500 EEV. A. lEYING ON" A GENEEAL SECTION OE THE 



exposed with the same sequence of beds shown three miles off at 

 "Wellington College (figs. 1, 2) is remarkable. 



4. Yateley Green. — A well, eighteen feet in depth, has been 

 lately sunk here at the residence of the Misses Eidley. This well is 

 entirely in the thick middle green sands of the Middle Bagshots. 

 Nothing but green sand was passed through, of the same character 

 as that of the beds Nos. 7 and 8 in figs. 1 and 2, and the water- 

 bearing horizon at the base of these green sands was reached. 

 There was a great " find " here of Middle Bagshot fossils of 

 Bracklesham age, which Prof. Prestwich has pronounced to be the 

 most perfect forms he has yet seen from the Bagshot beds of the 

 London Basin. They include very well-preserved specimens of 

 Carclita planicosta (in great numbers), Ostrea flabellula, Natica am- 

 bulacra, and a fish- vertebra, probably of the genus Otodus. 



The height of the beds here exposed corresponds almost to a foot 

 with the height of the same beds in the College well-section (fig. 1). 



5. Farnborough. — A very good section of the buff-yellow Upper 

 Bagshot Sands is shown in the cutting of the main line of the 

 S.W. Eailway to the east of the station, and is continued in the hill 

 above, where these sands have been lately exposed by an excavation 

 for the crypt of the Imperial Mausoleum just erected on the summit 

 of the hill. The base of the upper division is not exposed. In 

 the excavation for the crypt, the sand was found to be washed 

 almost to a clean white sand, and partly indurated near the surface, 

 the depth of the sand of this character increasing as the hill was 

 descended. This I attribute merely to the solvent action of the 

 humus-acids furnished to the rain-water as it percolated through 

 the sand having dissolved out the iron as neutral soluble salts, the 

 iron being afterwards precipitated by oxidation when the water was 

 thrown out by springs at lower horizons. This process may still be 

 observed in numerous streams in the Bagshot country. Masses of 

 sand more than usually ferruginous were met with here, as in other 

 sections in the Upper Sands ; and in some of these casts of shells 

 were found, including one of PanopcEa intermedia, a species figured 

 in Dixon's ' Geology of Sussex ' as belonging to the Bognor Sands. 

 The height of this hill is 285 feet above O.D. level, and from 70 to 

 80 feet of strata are exposed down to the level of the line. 



At Farnborough Eectory, a quarter of a mile to the south (250 

 feet above O.D.), a well dug last year reached the clay at the base 

 of the Upper Bagshot at a depth of 46 feet. 



6. Aldershot. — The mass of Upper Bagshot mapped by the 

 Survey east of the South Camp is known as Thorn Hill (400 feet 

 high). A sand-pit on the southern face of this hill exposes true 

 Upper Sands, and shows the correctness of the map here. At 350 

 feet above O.D. level the true Bagshot Pebble-bed is seen cropping 

 out between this hill and Cambridge Hospital, and restmg upon a 

 yellow and brown loam with seams of pipe- clay. West of the 

 hospital, at the same level, the Pebble-bed is three feet thick, 

 where it caps the escarpment; it dips to the north, conformably 

 with the underlying bed of brown and yellow loam. A little further 



