34 ME. H. W. MOIsTCKTON 0]Sr THE GKAYELS SOUTH OF 



Eidges plateau, but I am inclined to look upon the gravels of 

 the former as of a more recent date than those of the latter, aa 

 I will explain presently. Grravel-pit Hill, described by Prof. 

 Prestwich,^ is a northern spur of Easthampstead Plain, and gravel 

 has been dug there for many years. A few years ago a new pit 

 was opened on this hill at 400 feet above O.D., and in it I have 

 found two boulders of a kind extremely rare in the Southern Drift, 



The first was found in 1889, and exhibited at a meeting of the 

 Geological Society on Dec. 18 of that year. Dr. A.- Irving has since ^ 

 expressed an opinion that it did not come from the gravel, because I 

 had not found it actually in place, but on a heap of gravel prepared 

 for carting away. As, however, the pit is far out on the moor^ 

 away from railways, roads, and even cultivated fields or houses, I 

 for my part have no doubt about it ; of course, I should have pre- 

 ferred to find the boulder in situ. It is a mass of white vein-quartz 

 which has been broken across diagonally before being embedded in 

 the gravel, and retains externally the bright yellow colour of the 

 gravel. It has portions of irony sand ' pan ' adhering to it, show- 

 ing conclusively that it did not come from the top sand or surface- 

 bed, everything in which is bleached.^ The boulder measures 

 6J X 5| X 3| inches, and its weight is 6 lb. 9 J oz. 



The second boulder was found by me some time afterwards lying 

 on the floor of the pit ; evidently it had been recently dug out, and its 

 yellow colour and marks of ' pan ' show clearly that it was embedded 

 in the gravel. It is not broken, and appears to be a white quartzite, 

 though not a sarsen-stone. It measures 6'|- x 6 X 3| inches, and its 

 weight is 7 lb. 4| oz. 



By the kindness of Col. Cooper King and Prof. E-upert Jones a 

 third boulder was exhibited on reading the present paper. It was 

 found in Col. Cooper King's garden at Camberley in what was (so far 

 as he knew) untouched gravel, but near the surface, and it is con- 

 sequently bleached. The gravel is one of the terraces or benches on 

 the side of the great plateau. The boulder is of white vein-quartz 

 sheared and recemented ; it has been rolled and broken across diago- 

 nally in the same manner as the first one, and measures 4| x 4 x 2| 

 inches ; its weight is 2 lb. 9-| oz. 



I saw a fourth boulder of white vein-quartz in the gravel-pit on 

 Ascot Eacecourse ; it was bleached and lay on a heap of gravel. 

 Measurement : 3 X 3 X 2| inches- 



Though I look upon the occurrence of these boulders as interesting, 

 I do not found any argument upon them, and it may be added that 

 the gravel has no resemblance to the Glacial Gravel, whether they 

 come from it or not. Small quartz-pebbles up to | inch are com- 

 mon, but I have found none on this plateau measuring as much as 

 an inch in length or ^ oz. in weight. 



The large blocks of sandstone called sarsen- or sarsden-stones are- 



1 Quart. Journ. Geol. Soc. vol. xlvi. pp. 160, 161, fig. 2. 



2 Ibid. p. 558. 



* See Prof. Prestwich's fig. 2, ibid. p. 161, in which the bleached portion is- 

 very well shown. 



