AND BAGSHOT BEDS OP ALDEKSHOT. 



437 



Clay at his house, which is about halfway between the Ash Stations on 

 the Soiith-E astern Railway and South- Western Railway, and is situ- 

 ated just by the outcrop of the London Clay. The well was deepened 

 to about 300 feet in 1864, before the South-Western Railway 

 Company bored the one close by, which later boring considerably 

 reduced the supply of water in the Ash-Grange well. Thus it seems 

 that the well draws its water from the base of the London Clay, or 

 from the Woolwich and Reading beds ; and restoring what erosion has 

 removed, we get a thickness of 320 feet, if the bottom of the well 

 is the base of the London Clay. 



The south slopes of the extremity of the Pox Hills, near Ash, give 

 a very good section of the Upper- and Middle-Bagshot beds. Com- 

 mencing at Ash Yale, we have the pebble-bed, about 2 feet thick in 

 a dark green clayey sand, partly in situ and partly reconstructed. 

 The pebbles show considerable current-action, having their longer 

 axes inclined at about 70°. This bed may be traced continuously 

 round the foot of the hills, and occurs cropping out on the hill-slope 

 about the brickfield referred to by Messrs. Monckton and Herries in 

 their account of the Wyke-Lane section. Here, below the pebbles, 

 are sandy beds which furnish with water the springs which are 

 thrown out by the clays at the base of the Middle-Bagshot beds. 



The next section I propose to discuss is one across the valley, 

 between Aldershot Town and the Permanent Barracks, and con- 

 tinued on to the Aldershot Waterworks (fig. 3). 



The section begins on the top of the hill overlooking South 

 Camp, and as this point is not 300 yards east of the deep-boring at 

 D Lines, described above, I have felt myself justified in plotting 

 the thickness of beds given there at this end of the section. The 

 base of the Middle Bagshot crops out as a clay-bed, at about the 

 320-feet contour on this line of section ; and again some 100 yards 

 to the west it is exposed under Red Hill at the same level. This is 

 slightly below the spot where Mr. Blake is mentioned by Mr. 

 Irving as finding a " sandy bed containing numerous green grains " 

 (Proc. Geol. Assoc. vol. ix. jSTo. 6). This bed I also saw in 

 November last, when this section was opened up by a drain from the 

 beginning of the section to the top of the hill marked 340 (fig. 3). 

 All along this drain the same yellow and buff-coloured sand was 

 exposed, as soon as the Middle-Bagshot beds had been left on the 

 north side of the valley ; and a glance at the section will show that 

 this drain was cut in the same portion of the Lower-Bagshot strata, 

 owing to the corresponding dip of the beds and slope of the ground. 



These Lower-Bagshot beds crop out on the south slope of the hill 

 behind the brickyard by Aldershot Station, and are exposed in a 

 sand-pit at the top of the hill near the reservoir, as mentioned by 

 Mr. Monckton in a footnote to his last paper. 



The dip which I have drawn, viz. 2|° North, was obtained by 

 several means. Pirst, it can be measured at the top of the hill at 

 the north end of the section, as stated by Mr. Irving (Quart, Journ. 

 Geol. Soc. vol. xli. p. 501), where he describes it as 2 0, 5 north ; the 

 lines joining the points of outcrop of the Bagshot strata with 

 corresponding points in the South-Camp well give the same, as- 



