Vol. 54.] GRAVELS IN BERKSHIEE AIJ^D OXFORDSHIRE. 591 



Mr. H. W. MoTickton has described its occarrenoe on the Tile- 

 hurst and Groring Heath plateaux.^ In the district to which reference 

 is made in this paper it ranges, roughly speaking, from 200 to 400 

 feet above the present level of the Thames. 



The deposit on the summit of Streatley Hill (Common Wood), 

 at about 550 feet above sea-level, has been described by Mr. H. 

 J. 0, White/ who notes the occurrence therein of red quartzibe- 

 pebbles. At a level of a little o^er 530 feet, near the road from 

 Goring to Aldworth, there is a gravel-pit on the golf-links which 

 has been worked to a depth of about 6 feet. About one-half of 

 the gravel here consists of rather large rolled flints, with a few flint- 

 pebbles and a quantity of small quartz-pebbles. There are also 

 quartzites of large size and of Bunter character, although these are 

 not relatively numerous, and some fairly large masses of sarsen- 

 stone. The stratification is not very pronounced, but follows the 

 slope of the hill. The association of the small quartzite-pebbles 

 with the larger material may indicate the re-arrangement of an 

 older deposit. 



Another interesting section occurs at the brick-kiln near Kiln 

 Farm, Upper Basildon, at a level of about 455 feet. This is only 

 about 10 feet below the hilltop, where the gravel, although con- 

 taining a few quartzites of Bunter character, is generally of the 

 quartzose type, and has been already mentioned (p. 587). The 

 section seen at the kiln was 5 or 6 feet thick, and consisted of 



Buff clay with few pebbles ; 



Pebbly clay, becoming ferruginous and sandy at the base, overlying 



Woolwich & Reading Clay. 



The gravel here contains only 15 per cent, of flint and a large 

 proportion of purple and brown quartzites. The pebbles are in places 

 embedded in a red clay resembling the matrix of the Clay-with- 

 flints. The deposit is of variable thickness, and appears to lie in 

 hollows of the surface. 



This section illustrates the close relationship existing between the 

 Quartzite-gravel and the Quartzose Gravel. The sudden appearance 

 of a deposit containing so large a proportion of quartzites of Bunter 

 character is also remarkable as occurring in a Cretaceous district, 

 the proportion of flint-material being really insignificant. The 

 deposit, however, does not suggest ordinary sedimentary action.^ 



A section in this gravel at Eose Hill Kiln, near Caversham, at a 



1 Quart. Journ. Geol. See. toI. xlix (1893) p. 308. 



2 Proc. Geol. Assoc, vol. xiv (1894) p. 22. 



^ [It is probable that the gravel at this level was not seen by Sir J. Prestwich. 

 Mr. H. J. O, White {op. jam cit.) remarks that the Upper Basildon deposit is 

 ' undoubtedly Glacial.' That is especially true of the section under considera- 

 tion, and might also be said of the gravel on the hilltop.] 



