590 ME. 0. A. SHKTJBSOLE 0?f SOME HIGH-LEVEL [i^OV. I 898. 



Bunter Beds, in the surface-gravel of the Lickey Hills, in the 

 Faringdon Greensand gravel, and in the Berkshire gravels. This 

 deposit therefore seeros to afford evidence that part of the material 

 of these gravels has been derived from the breaking-up of older 

 pebble-beds. 



One source of the foreign material in the Quartzose Gravel might 

 perhaps be indicated in the Lower Greensand. The pebble-beds 

 belonging to this formation have been described by the late W. 

 Keeping,^ and, judging from his description, we have in those beds 

 an assemblage of rocks very similar to that which occurs in the 

 Quartzose Gravel. 



Similar pebble-beds nearer to our own area, and now removed 

 by denudation, may have furnished much of the material of that 

 gravel. A relic of such beds still exists at Faringdon in Berkshire. 

 The sponge-beds at that locality contain small pebbles which I found 

 to be in the following proportion : — 



Per cent. 



Flint or flinty chert 25 



Variegated chert 16 



Hard pale sandstone 1 



Quartz 35 



Qiiartzite 8 



Subangular chert 1 



Ironstone-grit 1 



Coarse quartz-grit 1 



Grrey and brown grit 7 



Compact sedimentary rock 3 



Lydite 2 



There is here the same general resemblance to the material of 

 the Quartzose Gravel, and that resemblance roughly holds good for 

 the relative proportion of quartz-pebbles, quartzites, and grits. The 

 red-and-black variegated chert, however, has not yet been noted in 

 the Quartzose Gravel. 



Another possible source of some of the constituent materials of 

 this gravel has been suggested by Mr. A. E. Salter.^ He considers 

 that they may have been derived b}" re-deposition from an old river 

 formerly draining Dorset and Devon, and connects them with the 

 gravel on Blackdown Hill, regarded by Mr. Clement Reid as of 

 Bagshot age.^ On this matter I do not venture an opinion. 



Y. The Qitaetzite-geavel. 



Under this name I refer to the gravel which is generally, and 

 perhaps properly, called ' Glacial.' In composition it is, to some 

 extent, a repetition of that just described, but the brown and purple 

 quartzites are a more conspicuous element, and the material on the 

 whole is of a larger size. It has also a wider range, at least in a 

 north-westerly direction ; for I have not observed the Quartzose 

 Gravel on that side of the Goring gorge. 



1 Geol. Mag. 1880, p. 414. 

 ^ Proc. Geol. Assoc, vol. xv (1898) p. 264. 



3 'The Eocene Deposits of Dorset,' Quart. Journ. Geol. Soc. vol. Hi (1896) 

 pp. 490-495. 



