DAKOTA AND NEBRASKA. 



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General Section of the Tertiary liocJcs of Nebraska. 



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White and light drab clays, with 

 some beds of sandstone, and local 

 layers of limestone. Fossils: Oreo- 

 don, Titanotherium, HyoiJOtamus, 

 JRJiinoceros, Anchitherium, Hyceno- 

 don, Machairodus, Trionyx, Testudo, 

 Helix, Planorhis, Limncea, petrified 

 wood, &c., — all extinct. No brack- 

 ish water or marine remains. 



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Bad Lands of White River, 

 under the Loup River beds on 

 the Niobrara, and across the 

 country to the Platte. 





SUBDIVISIONS. 





LOCALITIES. 



FOREIGN 

 EQUIV. 





Fine loose sand, with some lay- 





On Loup Fork of Platte 





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ers of limestone. Contains bones of 





River. Extending north to 







Canis, Felis, Castor, Equufi, Masto- 



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Niobrara River and south to 



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don, Testudo, &c., some of which are 



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an unknown distance beyond 



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scarcely distinguishable from living 







the Platte. 



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species ; also Helix, Physa, Suc- 





 







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cinea, probably of recent species. 

 All fresh-water and land types. 



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Light and ash colored sandstones, 

 with more or less argillaceous lay- 

 ers ; fossils ; fragments of Trionyx, 

 Testudo with large Helix vivipara, 

 petrified wood, &c. No marine or 

 brackish water types. 



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Wind River Valley ; also 

 west of Wind River Mountains. 



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Beds of clay and sand, with 

 round ferruginous concretions, and 

 numerous beds, seams, and local 

 deposits of lignite ; great numbers 

 of dicotyledonous leaves, stems, 

 &c., of the genera Plaianus, Acer, 

 TJlmus, Pojndus, &c., with very 

 large leaves of true fan palms ; 

 also Helix, Melania, Vivipara, Cor- 

 hicula, Unio, Ostrea, Potamomya, 

 and scales of Lepidottis, with bones 

 of Trionyx, Emys, Gompsemys, Cro- 

 codilus, Sec. 



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Occupies the whole country 

 around Fort Union. Extend- 

 ing north into the British pos- 

 sessions to unknown distances, 

 also southward to Fort Clark. 

 Seen under the White River 

 group, on the North Platte 

 River above Fort Laramie, 

 also on west side of Wind 

 River Mountains. 



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