Sheppard : Geology of Brough, East Yorkshire. 139 



Further details of this bed can be found in a paper on 

 ' Sections at Cave, Yorkshire,' by Messrs. Keeping- and Middle- 

 miss, printed in the 'Geological Magazine '. for 1883; in the 

 Survey Memoir on the district ('The Geology of the Country 

 between York and Hull,' 1886), or in the Rev. E. M. Cole's 

 'Geology of the Hull and Barnsley Railway,' 1886. 



Next in succession comes the Oxford Clay. When the Hull 

 and Barnsley Railway was constructed a bed of this, 15 feet in 

 thickness, was met with in the cutting immediately above the 

 Kelloway Rock, though it was almost wholly covered by surface 

 deposits ; and at the present day it is so grassed over as to be 

 difficult to examine at all. I have collected the typical Oxford 

 Clay Belemnites here, just above the ledge of Kellaways Rock, 

 and, in addition to these, Messrs. Keeping and Middlemiss, in 

 their paper already referred to, record Gryphcea dilatata, 

 a paddle bone of Plesiosaurus, and fossil wood. I know of no 

 other undoubted exposure of Oxford Clay in the neighbourhood. 



A little further east the line cuts through a thin bed of dark 

 clay which has been referred to Kimmeridge Clay, but there 

 seems to be some doubt about this. It has been suggested that 

 a representative of the Speeton Clay occurs here ; it is quite 

 possible that the equivalents of both are represented, but the 

 unsatisfactory condition of the exposure makes this a moot 

 point at present. I have seen some small Belemnites from the 

 section, however, which greatly resemble Kimmeridge Clay 

 species. 



1 have now briefly described the local Jurassic rocks, from 

 the Lower Lias upwards. So far each rock has appeared, lying 

 comformably on its predecessor, each and all dipping towards 

 the east at a low angle. The Hull and Barnsley Railway, 

 running east and west, has cut through them, successively, 

 practically at right angles to the strike, thus affording an 

 exceptional opportunity of seeing them in their natural order. 

 But now that we have reached the Kimmeridge there is most 

 conclusive evidence of a change in the usual course of events 

 having taken place. The regular deposition of the various 

 strata we have reviewed is clear evidence of the rocks having 

 been deposited, without serious interruption, one after another, 

 though at different depths and under different circumstances. 

 Still there is no great break - no pronounced unconformity. 

 Before the chalk was deposited, however, the rocks were 

 upheaved, denuded, and levelled off. They then sank again, 

 after which first the Red Chalk and then the White Chalk w ere 



mum May 2. 



