268 



HISTORICAL PALEONTOLOGY. 



GENERALIZED SECTION OF THE CRETACEOUS SERIES 

 OF BRITAIN. 



Fig. 185. 



Eocene. 



White Chalk with Flints. 



White Chalk without Flints. 



- --^...j _ ^_ _-^--|^ Chalk Marl. 



Upper Greensand. 



Gault. 



Lower Greensand or 

 Neocomian. 



Weald Clay. 



Wealden Series. 

 Hastings Sands. 



In North America, strata of Lower Cretaceous age are well 

 represented in Missouri, Wyoming, Utah, and in some other 

 areas; but the greater portion of the American deposits of 

 this period are referable to the Upper Cretaceous. The rocks 



