1859.] 



HULL THIXNIXG-OUT OF THE SECONDARY HOCKS. 



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coast stretching westwards, northwards, and eastwards along the 

 margin of the Lower Permian basin. The whole of the low-lying 

 district between the highlands of Wales 

 and those of Cumberland was submerged, | "g l|.vi 

 and a channel was opened for the trans- 

 port of Triassic sediment by an oceanic 

 current from the north-west, by the agency 

 of which it was spread over central England 

 as long as the various kinds of sediment 

 were capable of being mechanically sus- 

 pended. 



The Lower Carboniferous Range of the 

 Penine Chain, which during the deposition 

 of the earlier Permian strata was elevated 

 into land, appears to have been completely 

 submerged under the Triassic sea. This 

 is presumed, independently of other con- 

 siderations, by the fact that we find the 

 same succession of Triassic beds on both 

 sides of this range. In Nottinghamshire 

 and Yorkshire, with the exception of the 

 " Tipper Mottled Sandstone," which has 

 thinned out, we find exactly the same 

 succession of subformations, both of the 

 Bunter and Keuper, as in Lancashire and 

 Cheshire. Now it will be shown presently 

 that all the sediment has been transported 

 from the north-west towards the east and 

 south, so that the strata must have been 

 deposited continuously across this portion 

 of Northern England, — an evident proof 

 that there was no separating barrier of 

 land. 



Thus, at Mansfield we find the following 

 section across the Trias, in which the same 

 subformations occur as at Chester (with 

 the one exception), while, at the same 

 time, the whole series is considerably 

 lessened in thickness. The section has 

 been drawn from the information supplied 

 by my colleague Mr. Talbot Avaline. 



Farther north, at Worksop, on the 

 borders of Yorkshire, the succession is the 

 same; so that we have here strong evi- 

 dence, if not absolute proof, that these 

 beds were continuous from Lancashire to 

 Yorkshire, right across the Carboniferous 

 Range. 



The Silurian regions of Wales and Salop 

 were also submerged and buried under 

 Triassic sandstones t<> ;t considerable extent 







