BARRENNESS AND FERTILITY. 



321 



equator, and reduces the liig-liest of oxir cidtivatcd liills 

 several hundred feet." 



The geological character of a district is also a great' 

 criterion by which to judg'e of the fertility or barrenness of 

 its soils and their prevailing' quality. With this view, the 

 followino- table will be of service.^ 



Prevailing quality of the Soil. 



Clayey. 

 TERTIARY SYSTEM. 



Deposits. 



1. Alluvial 



2. Diluvial I 



3. London clay ' barren. 



4. Plastic clay barren. 



SECONDARY. 



The chalk formation. 



Deposits. 



Upper chalk 



Lovv-er chalk 



Gault 



Green sand 



IVealden formation. 



Deposits. 



Wealden clay 



Hastings sand 



Ashburnham beds 



Purbeck beds 



Oolitic formation. 



Deposits. 



Upper oolite 



Kimmeridge clay ^ 



Coral rag 



Oxford clay 



Cornbrash 



Great oolite 



Fuller's earth 



Inferior oolite 



Lias formation. 



Deposits. 



Upper lias shale 



Lias marls 



Lower lias shale 



Lias rocks 



New red sandstone. 



Deposits. 

 Upper new red sandstone 



Lower ditto 



Magnesian limestone 



barren. 



barren. 



barren. 



barren, 

 b aren. 



barren. 



barren. 



barren 

 barren. 



Sandy or 

 rocky. 



barren, 

 barren. 



barren. 



barren, 

 barren. 



barren. 



barren, 

 barren, 

 barren. 



Loamy. 



fertile. 



fertile, 

 fertile. 



fertile. 



fertile. 



fertile. 



fertile. 



fertile, 

 fertile, 

 fertile, 

 fertile. 



fertile, 

 fertile. 



* Jour, Roy. Aij, Sac. vol. v. p. 591 . 



