Vol. 54.] OF THE BAGSHOT DISTRICT. 187 



On July 3rd, 1897, when with the Geologists' Association at 

 Woking, 1 was shown a sarsen in a sandpit, which was described b}' 

 the workmen as having been in the sand. The sandpit is at a 

 place called Betsford on the Geological Survey map, Sheet 8, and 

 Whitstreet on the new Ordnance 1-inch Survey map, Sheet 285. 

 The sarsen was about 4 feet in longest diameter, and had been 

 waterworn. The sandpit is in Lower Bagshot Beds. Unfortu- 

 nately the sand had all been worked away from above the sarsen, 

 but the adjoining part of the pit seemed to me to show signs of 

 * run of the hill ' and of re-arranged Bagshot Beds, and I suspect 

 that the sand which had been dug from over the sarsen was not 

 Bagshot Beds in situ. It is not unusual to find sarsens in sand near 

 the surface of the ground, unaccompanied by gravel. Several were 

 dug up when making a new football-ground at Wellington College, 

 and I have kept two specimens. They are somewhat waterworn, 

 and no doubt have been let down from their original position during 

 the course of denudation of the sand around them, as was long ago 

 suggested by Mr. Whitaker.^ Of course, these furnish no evidence 

 of ice-action. 



In his admirable ' History of the Sarsens,' Prof. T. Rupert Jones ^ 

 mentions some ' very fresh sarsens ' (by which I understand, stones 

 only a little waterworn) on Crawley Hill, a spur from the Chobham 

 llidges plateau. He describes them as at the bottom, or almost at 

 the bottom, of gravel, and resting, or nearly resting, on the Upper 

 Bagshot ; and all authors agree that this is a very usual position 

 in which to find sarsens. I have noted a section which illustrates 



Fig. 2. — Section on Red Road, Chohham Ridges, Surrey. 



'I- 



:•. Mil 



10 15 20 feet H.ir.M. 



[The level of the top of the section is 400 feet above Ordnance datum.] 



The plateau of Chobham Ridges extends to the west, and the valley is east 

 of the section. 



i = White (discoloured) sand and gravel of irregular thickness, up to 1 foot. 

 ii = Gravel of subangular flints, flint-pebbles. Lower Greensand chert and 

 ragstone, and small quartz : 6| feet thick at the western or plateau- 

 end ; 2 feet at the eastern or valley-end. 



This is Southern Drift of the Chobham Eidges plateau. A sarsen 

 2^ feet X 3 inches is shown at the eastern end of the section. 

 iii = Yellow sand : the lower part is Upper Bagshot Beds in s'ltic, the upper 

 part is the sand of the Upper Bagshot re-arranged ; 10 feet exposed. 



1 ' Geol. of Middlesex, etc.,' Mem. Geol. Surv. 1864, p. 72. 

 - Wilts Arch. & Nat. Hist. Soc. Mag. 1886, p. 122. 



