250 



PROCEEDINGS OP THE ACADEMY OP 



[1884. 



Lower, Middle and Upper, of the English geologists. The divi- 

 sions can be best represented by the following table, which is also 



n. 



TJppEK Cretaceous 

 (Chalk). 



Middle Marl Bed. 



Yellow Sand. 

 Shell Layer." 



Pure Green Sand. 



Indurated Marl 

 Bed. . . . 



Middle Cretaceous 

 (Upper Green Sand,Gaiilt). 



Lower Cretaceous 

 (Wealden?). 



Lower Marl Bed, 



Indurated Marl. 



Red Sand. 



Black Argillo-Micaceous 



Marl, 



Shell Marl, 

 Cretoidal Marl. 



Sand Marl, 



Plastic Clays. 



Sand and Clay Marls. 



Red Clay. 



Fire-Clays and Sands. 



