BAGSHOT STRATA FROM ALDERSHOT TO WOKINGHAM. 501 



west a very marh' bed, "svith many pipe-clay laminoe, is seen in a 

 road-cutting dipping 2'''5 north ; below this is a more sandy bed 

 with numerous green grains. 



Crossing over to the south side of the town, a good section, opened 

 in the last two or three years, is met with in the brickyard 

 between the reservoir on the hill and the station. Here a brown 

 and yellow loam, well stratified, with numerous seams of pipe-clay 

 (some of them several inches in thickness), corresponding in cha- 

 racter with that which underlies the pebble-bed on the northern 

 side of the town, is seen with a dip of 2° souths with a layer of 

 indurated ironstone at the bottom, lying upon an eroded surface of 

 London Clay, which is now here worked extensively for bricks, and 

 is therefore seen in good fresh sections. Prom its position and 

 character I regard this loamy bed with its subordinated seams of 

 pipe-clay and green grains as the loamy bed l^o. 4 of figs. 1 and 2 

 developed in somewhat larger proportions on this southern side of 

 the Eagshot area. 



A similar loamy bed is exposed in the cutting at the foot of 

 Eedan Hill, which is penetrated by a short tunnel a short distance - 

 east of the station. Along the top of this bed of loam I found 

 perfectly rounded flint pebbles (some of large size) imbedded in a 

 stiff loam ; and above this line of pebbles buff-yellow sands are 

 exposed for about fifty feet vertical. The pebble-bed here and the 

 sands above appear to dip to the east; but that the true dip is a 

 good deal to the south of east is indicated by the occurrence of the 

 line of pebbles at a level some 15 feet lower in a well-section in 

 the cemetery to the south-east of the cutting. 



I got hold of a well-digger named Lynch, who has been engaged 

 in the digging of a good many wells (several of them being deep) in 

 and about Aldershot, and took him to look at the exposures of the 

 loamy bed, pointing out to him its characteristics. He assured me 

 that the same kind of " loamy sand " was invariably met with 

 before passing into the " blue clay " in all the wells of which he 

 had any knowledge, and the indurated ironstone band was generally 

 present at its base. From the depth he gave me of the surface of 

 the " blue clay " in several wells, the Eagshot Sands evidently lie 

 here unconformably against London Clay ; and we have seen above 

 that in one section at Aldershot (that in the brickyard) there are 

 good reasons for regarding the bed seen lying immediately upon the 

 eroded London Clay as the uppermost bed of the Middle Eagshot. 

 Eedan Hill, though mapped as Lower, must be regarded, I think, 

 in the face of the above evidence, as Uj^per Eagshot. 



The accompanying sectional diagram (fig. 3) has been constructed 

 from the evidence here given. 



6«. Ccesar's Camp, Aldershot. — The Middle Eagshot green sands 

 are exposed in a section at the rifle-butts at the foot of the 

 northern escarpment of this hill at the height of about 350 feet. 

 This gives us more than 200 feet as the thickness of the Upper 

 Sands in this hill and Eeacon Hill, which are 600 feet high. 

 Mottled clay, which it would be difficult to regard as anything else 



Q. J. G. S. No. 163. 2 M 



