File:The Quarterly journal of the Geological Society of London (14053360366).jpg

502
EEV. A. lEYIXG OX A GE2fEEAL SECTION' OE TKE
Fig. 3. — Section across the Valley of Aldershot Toiun.
(Greatlv exaggerated vertically.)
8. " X.
Aldershot Town Cambridge Thorn Hill.
Eed Hill. and Station. Hospital.
1. Diift graxel, chiefly of subangular discoloured flint lying on a deeply eroded
surface of
2. Upper Bagshot Sands, with predominant colour buff-yellow.
3. Bed of well-rounded flint pebbles.
4. Yellow and brown Icam and loamy sand, with numerous layers of pipe-
clay, occasionally several inches in thickuess.
L.C. London Clay. Occasional flint pebbles and shark's teeth are met with in
the clay -pits in the neighbouring brick-fields.
than reconstructed clay of the Eeading Beds, is present here in a
considerable mass several feet in thickness, intercalated with the
green sands. Above the rifle-butts a section of the Upper Sands
shows a dip of 2"^ south ; and in a section on the southern side of
the hill I measured a dip of 8° south. The hill-cap also slopes
about 2° to the south. The Middle Bagshot beds exposed at the
rifle-butts pass not only through Caesar's Camp, but through Hungry
Hill also, which has somehow got mapped as Loiuer Bagshot. This
hill is 550 feet bigh, the sections about its upper part, down to
about 350 feet, show Upper Bagshot Sands like those of the upper
200 feet of Caesar's Camp, and springs come out at about 350 feet
level. At about this level, on the southern slope of Hungry Hill,
in the village of Upper Hale, the water-bearing horizon at the base
of the Upper Sands is proved in two wells, one of which begins at a
height of about 450 feet and is 114 feet deep, while the other
begins at a height of 400 feet or so and is bQ feet deep. This
information was given me by the man who was engaged in digging
them. A little way further down the hiR the " blue clay " was
penetrated at a depth of about 2o feet. These facts do not
harmonize with the details of fig. 89, p. 376 of the Survey Memoir,
and they are still more discordant with the mapping, which repre-
sents the Middle Bagshot beds as cropping out on the eastern flank
of Caesar's Camp, where a drift-clay deposit lies upon the slope of
the hill ; it is to be seen at the rifle-butt filling an eroded hoUow
in the Middle Bagshot beds, which are as nearly as possible hori-
zontal, instead of lying at a high angle, as the mapping would
require. This clay is as unstratified as any Boulder-clay, and