THE PERMIAN PERIOD. 



195 



made out, and their total thickness is not more than a few 

 hundred feet. They consist of sandstones, conglomerates, 

 limestones, marls, and beds of gypsum. 



The following diagrammatic section shows the general 

 sequence of the Permian deposits in the north of England, 

 where the series is extensively developed (fig. 133): 



GENERALISED SECTION OF THE PERMIAN ROCKS 

 IN THE NORTH OF ENGLAND. 



Fig- 133- 





( Upper Red Sandstones 

 ) and Marls. 



Magnesian Limestone. 



Marl Slate. 



Lower Red Sandstones 

 and Breccias. 



Coal-measures. 



The record of the life of the Permian period is but a scanty 

 one, owing doubtless to the special peculiarities of such of the 



