144 



PEOE. J. PEESTWICH ON THE EELATION OF THE 



The whole is only a few (5 to 8 feet) thick, and is preserved in a 

 trough or hollow in the Oolite *. 



Still further westward, on the Carboniferous-Limestone Hills 

 near Clevedon, Mr. Trimmer f has recorded the existence of a 

 patch of local debris with, I believe, quartz-pebbles, at a height of 

 300 feet above sea-level. This may be a continuation of the 

 Kingsdown Bed, but intermediate connecting-links have yet to be 

 discovered, and I was not successful in finding the place myself. 



On the Chalk-hills to the south of the area we have described 

 there are a few outliers which may be referable to this geological 

 horizon, such, for instance, as the pebbly sands with worn fragments 

 of hard Tertiary sandstones on AVindmill Hill, near Alton, and a 

 pebbly drift on the higher hills west of Andover ; but these are too 

 indistinct to pronounce definitely upon. 



A better marked case is the one on the Chalk Downs of Copford, 

 8 miles east of Warminster, where a large Tertiary remnant has 

 been preserved from denudation by having been let down into a 

 cavity in the Chalk. This patch of Lower Tertiary (white sands 

 and mottled clay) is overlain by an irregular spread of Drift con- 

 sisting of : — 



1. Tertiary flint-pebbles — the larger proportion much decomposed, white 



and very light. 



2. White quartz-pebbles and a few rose-coloured ones. 



3. Worn fragments of a light-coloured sandstone (Upper Greensand ?). 



4. Pebbles of a dark chert and Lydian stone. 



These were imbedded in a light sandy matrix, and covered by a 

 sandy clay-drift full of angular flints ; this pit at the time of my 

 visit was much obscured. 



5. The Relation of the Westleton Shingle to the Glacial Drifts 

 of the Thames Valley. 



We have thus been able to follow the Westleton Beds from the 

 coast of the Eastern Counties with some certainty as far as the 

 Berkshire Downs, and with some probability as far as the Bristol 

 Channel. On the Eastern coast this deposit lies at the sea-level, 

 but as it ranges inland it gradually rises to heights of 500 or 600 

 feet. In the first instance the Westleton Beds underlie all the 

 Glacial deposits ; in the second they rise considerably above them, 

 and their first seeming subordination to the Glacial series altogether 

 disappears (see fig. 1, PI. VII.). 



The association, which is so close in jN"orfolk that it had led to the 

 two series being considered members of the same group, becomes 

 less so in Essex. At Braintree, where the AVestleton Beds are 

 largely developed, they stand up through the Boulder-clay and 

 gravel which wrap round their base and partly surmount them. 



* Mr.C. H. Weston, who first noticed this high-level drift, states also that 

 Chalk-flints mixed with Oolitic debris occur on the surface of Farleigh Down 

 at a height of about (500 feet (Quart. Journ. Geol. Soc. vol. tI. p. 449). 



t Quart. Journ. Geol. Soc. vol. ix. p. ^82 (1853). 



