1850.] WESTON ON THE DILUVIA AND VALLEYS OF BATH. 449 



is strewed with drift-gravel (chiefly derived from No, 6), capped by 

 a reconstruction of the London clay, which might easily be mistaken 



P Fig. 7. — Section in Blackheath Cutting, 



7 feet by 15 feet. 



«, a. Alluvium. b, h. Drift. 



c, c. Coloured clay and green sand, derived from " No. .3," with fragmentary shells (d) from 

 " No. 4," and pebbles (e). 

 /. Ash-coloured sand with ferruginous lines and concretions. 



for that bed in situ. In consequence of this drift, the sections made 

 by the stream are of little value, though occasionally the stream has 

 worn its way down to the true tertiary substratum. 



Hence the Map cannot give the boundary-lines of the strata with 

 certainty on the low ground ; elsewhere I trust that it will be found 

 to be as correct as the scale permits. 



3. On the Diluvia and Valleys in the Vicinity o/Bath, 

 By Charles Henry Weston, Esq., F.G.S. 



[Abstract.] 



Mr. Weston met with beds or considerable masses of chalk-flint di- 

 luvium on the crest of Kingsdown, one of the hills forming the 

 eastern side of the Box Valley, about five miles from Bath. The 

 drift was in situ on the upper portion of the Great Oolite, and filled 

 up a trough or **gulley." With the exception of occasional masses 

 of Great Oolite, it consisted entirely of chalk flints with ferruginous 

 clay. Some of the flints were rounded and some were brecciated, while 

 others, although smoothed superficially, retained their original forms 

 of polypothecian organization so characteristic of the chalk formation. 

 Mr. Weston could detect no fossils in this deposit. The height of 

 these beds, determined by barometrical admeasurement, was found to 

 be 545 feet above the level of the river Avon. The oolitic rock on 

 which these drift beds are deposited is superficially much hollowed 

 and apparently waterworn ; its stratification is horizontal, and it is 

 traversed with superinduced cross joints and fissures. In a quarry 

 that had been worked under the hill and contiguous to the bed of 



