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(Nebraska ) 

 Alluvium. Peat. 



Terraces. Beaches. 



Loess. 



Iceberg Drift. Karnes 

 Forest Bed. | Glacial Drft. 

 Chainplain clay Blue clay. 



Pliocene. 

 Miocene. 

 Wanting. 



Not Exposed. 

 Pierre Group. 

 Niobrara Group 

 Benton Group. 

 Dakota Group 

 Wauling. 



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P 



Triassic Sandstones. 

 Marl. Coal, &C. 



Atlantic Coast New Mexico Wanting. 



Arizona, Clifornia, 



Souora, itc. 



(N America ) 

 Cave Deposits. 

 Peat. Alluvium. 



Terraces. Loess. 



Saxicava Sand 



Forest Bed 



Chainplain Clay. Erie ('lav. 



Glacial Drift. 



Pliocene. 

 Miocene. 

 Eocene. 



Laramie Group. 

 \ Fox Hill Group. 

 } Pierre Group. 

 j Benton Group. 

 ( Dakota (iron]) 



(.Wanting?) 



Jurassic Strata, 

 Colorado. 

 Utah. Nevada, 

 California, Sonora. 



i 

 Ph 



Historical. 



Terrace. 



Chainplain. 



Glacial. 



Pliocene. 

 Miocene. 

 Eocene. 



Upper Cretaceous. 

 Middle Cretaceous. 

 Lower Cretaceous. 



Wealden. 

 Oolitic. 



Liassic 



Keuper. 

 Muschelkalk. 



Bunter-Sandstein 



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