﻿452 PROCEEDINGS OE THE GEOLOGICAL SOCIETY. [Apr. 24, 



of this area, is indicated by some of the above-mentioned marine 

 shells exhibiting varieties peculiar to brackish waters *. It is to be 

 observed, nevertheless, that no other freshwater shells nor any land- 

 shells are found in the Kelsey Hill beds ; but this may arise from the 

 strength and solidity of the Gyrena being superior to that of the 

 ordinary freshwater and land-shells. Its numbers are also remark- 

 able. It occurs literally in thousands. For these reasons I am 

 inclined to believe it to have been contemporaneous with the marine 

 shells with which it is found associated. 



With regard to the position of the Kelsey Hill gravels, the coast- 

 section from the Humber to Bridlington shows cliffs of Boulder-clay 

 capped here and there by similar gravels, but not so fine and sandy. 

 Well-sections throughout Holderness also show the Boulder-clay to 



extend inland to Hull and Beverley. As this clay could not be seen 

 beneath the gravels at Kelsey Hill, I proceeded to examine the 

 river-side section described by Professor Phillips at Paull Cliff, a few 

 miles below Hull. I there found several of the same shells (including 

 the Gyrma, but in much fewer numbers and more broken) in beds of 

 sand with but little gravel, reposing upon an irregular surface of grey 

 clay ; but, this clay containing no boulders or fossils, I could not feel 

 certain about its being the Boulder-clay. 



As I eovdd not remain to superintend a series of trenches and 

 borings which seemed necessary to settle the question of superposi- 

 tion, my friend Mr. T. J. Smith, F.G.S., of Hull, who had accompanied 

 me on my last visit to Kelsey Hill and also to Paull Cliff, undertook 

 to see them carried out ; and I am indebted to his active co-operation 

 for the following resvdts. The drfficidties, however, were greater 

 than we anticipated, and the results less. Owing to the wet season 

 it was found impossible to dig a trench to any depth at Kelsey Hill : 

 * The occurrence of the two species oiSissQO has now to be noticed. 



