PERMIAN. 115 



CHAPTER XIV. 



PERMIAN AND TRIAS. 



The deposits which rest next in succession 

 upon the Carboniferous series are termed Permi- 



they appear to be identical with the 



ita found in the Russian government of Perm. 



They h n termed Poikilitic, or variegated 



netimes the Pontefract rocks, from 



rrei e at that town in Yorkshire. 



Marine beds in the east of England represent 



them b< Hartlepool and Nottingham, but 



imetimes been 



er and lacustrine deposits 



nth-west of England. They 



to be unconformable to the underlying 



In other localities 



iration between the lower 



mian r< id the Carboniferous. Such 



litions a and ( Cheshire, 



urring in Russia, and 

 in N<»rth Am 



lower - in Cumberland yield 



: ( larboniferous plants. 



It 'hat near Knville 



in Wot ire, and in other localities, the 



mian rocks contain ang 5, which 



ished, and scratched apparently by ice; 



though the scratched Stones may not be evidence 



that glacial conditions prevailed in that district 



in the Permian per: 



The Permian rocks of Great Britain comprise 

 lower, middle and upper scries. The upper and 

 lower parts are sandstones and conglomerates, or 



