FROM THE CRETACEOUS FORMATION OF NEBRASKA. 



405 



Section of the Members of the Cretaceous Formation as observed on the Missouri River, 

 and thence Westward to the Mauvaises Terres. 



3 





 u 



Clays, sandstones, etc., etc., containing remains of Mammalia. The "entire 

 thickness of this formation in the Bad Lands is from 25 to 250 feet. 



5. -j Arenaceous clay passing into argillo-calcareous sandstone. 80 feet. 



f Plastic clay with calcareous concretions containing numerous fossils. 250 



J to 350 feet. 



' I This is the principal fossiliferous bed of the cretaceous formation upon 



[ the Upper Missouri. 



( Calcareous marl, containing Ostrea congesta, scales of fishes, etc. 100 to 



' ( 150 feet. 



2. ] Clay containing few fossils. 80 feet. 



1, -j Sandstone and clay. 90 feet. 



Buff-colored magnesian limestone of the carboniferous period. 



List of Fossils heretofore identified and described from the Cretaceous Formation of 



Nebraska. 



Nautilus Dekayii, Morton. 

 Ammonites placenta, Dekay. 



" mandanensis, Morton. 

 " Nicolletii, " 



" Conradii, " 



" abyssinius, 

 " cheyennensis, Owen. 

 " Nebrascensis, " 



lenticularis, 



" opalus, " 



moreauensis, " 

 Scaphites nodosus, 



" comprimus, 

 Baculites ovatus, Say. 



compressus, Say. 

 Belemnites Americanus, Morton. 



Rostellaria Nebrascensis, Evans and Shumard. 



Solarium flexistriatum, Evans and Shumard. 

 Pholadomya elegantula, " 

 Mytilus galpinianus, " 



Avicula linguae formis, 



" triangularis, " 



" cretacea, Conrad. 

 Ostrea congesta, 



" vesicularis, Lamarck (on the authority of M. 



Nicollet's list). 

 Inoceramus Barabini, Morton. 



(= I. Crispii ? Mantell.) 

 " sagensis, Owen. 



" Nebrascensis, Owen. 

 Cytherea Missouriana, Morton. 

 Tellina occidentalis, 

 Cucullea Nebrascensis, Owen. 

 Anomia tellinoides, Morton. 

 Hypponix borealis, " 



