STEATIFIED FOSSILIFEROUS BOCKS. 117 



has been estimated as below ; but the statement must be 

 regarded only as an approximation to the truth ; the pro- 

 bability is that, with reference to the lower beds, the thick- 

 ness is much greater than is here mentioned : 



Feet. 



Tertiary System 2,000 



Cretaceous . 1,100 



Wealden 1,000 



Oolite and Lias 2,500 



Saliferous 2,000 



Carboniferous \ f 10,000 



Old Eed Sandstone ' 10,000 



Silurian 7,500 



Cambrian 20,000 



Cumbrian, at least 10,000 



Primary, unascertained, but far exceeding that of any of the 

 superposed deposits. 



The annexed TABLE exhibits a classification of the STEATI- 

 FIED FOSSILIFEBOUS BOCKS, in a descending order as they 

 occur in England. Each period is divided into groups, and 

 each group into subordinate stages ; each stage is charac- 

 terised by a Fauna and a Flora that is special to it. 



STRATIFIED FOSSILIFEROUS ROCKS. 



TERTIARY PERIOD (Cainozoic Series, Phillip/). 



f Travertin Peat 

 Recent Group . . | g^ ^ ^ 



Pleistocene Group, J Marine beds 

 Erratic block period, \ Freshwater beds 



Pleiocene Group . Mammaliferous Crag 

 Miocene Group. .{{, 



C Fluvio- Marine beds 

 P, J Bagshot Sands 



r U P ' ' i Barton and Bracklesham Sands 

 L Bogrior Rocks. 



Superior Order, 

 (Conybeare) 



