188 ME. H. W. MO]SrCKTON ON SOME GRAYELS [^aj 1 898, 



this remarkably well. It is a cutting on a road, named Eed Eoad 

 on the 6-incli map, on the east side of Chobham Eidges. The 

 cutting extended from the 400-foot contour-line down to a level of 

 360 feet above Ordnance datum. 



This section (fig. 2, p. 187) is of especial interest, because it 

 extends from the surface down into the Upper Bagshot Eeds and 

 shows : 



Ist. The irregular base of the gravel, which, it will be seen, thickens towards 

 the plateau. 



2nd. The position of a sarsen lying flat at the bottom of the gravel. 



3rci. The re-arranged sand under the gravel passing down into the Bagshot 

 sand in situ. I was unable to decide as to the precise line between the 

 re-arranged bed and the Bagshot bed. In the upper part of the 

 sard there was an irregularly stratified appearance, which was entirely 

 absent in the lower part of the section, and which I have never seen 

 in the Upper Bagshot Beds. This is indicated by faint lines in fig. 2. 



I have a number of notes of sarsens, large and small, which 

 I have seen in gravel-pits. Most of them were at, or close to, 

 the bottom of the gravel, and resting wholly or partly upon sand; 

 though it was in most cases not possible to say with certainty whether 

 the sand was Bagshot in situ, or had been re-arranged. I have 

 taken photographs of some of these sarsens, and I propose to offer 

 copies to the Society for reference. 



There are some pits on the top of Chobham Eidges, close to the 

 Eoyal Albert Asylum, and at a level of 400 feet above Ordnance 

 datum, in which sarsens may be usually seen. 



In one place I noted three sarsens close together, the largest 

 1 foot 5 inches in breadth. They were under 5| feet of gravel, 

 which was very irregularly stratiued and much contorted in places. 



I noted in another place a section showing : — 



1. Gravel with very irregular stratification 5 feet 



2. Sandy gravel with current-bedding 2 feet, 



and I have often seen a similar state of things in the gravels at 

 Hayes, Dawley, etc., that is, well stratified below and irregularly 

 stratified or contorted above. 



In a pit a little south of the last mentioned, near the Eoyal 

 Albert Asylum, the gravel is thinner (3 to 5 feet) and the sarsens 

 are more easily uncovered. They are flat waterworn stones ; the 

 largest that I have seen measured 11 X 7| feet X 1 foot 11 inches. 

 On one occasion I counted twenty-five stones in this pit, each over 

 3 feet in length. 



I took some photographs of this pit, one of which is reproduced 

 as fig. 3 (p. 189), and in it several sarsens are shown. They had 

 not, I think, been moved since they were uncovered : the gravel had 

 merely been worked away from above them, and the edge of the 

 working is seen in the photograph behind the sarsens. 



As I have said, there is nothing to show that the sand on which 

 these stones rest has not been re-arranged. I could find no sign of 

 fossil shells in the sarsens, so they may be a consolidated part of a 

 re- arranged bed, and I have no doubt that some sarsens are con- 

 solidated gravel. I exhibit two specimens. The first, a fragment 



