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. 



■a 



s 



t-, 



o 



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

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



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



( Plastic clay with calcareous concretions containing numerous fossils. 250 

 j to 350 feet. 



1 This is the principal fossiliferous bed of the cretaceous formation upon 

 L the Upper Missouri. 



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

 I 150 feet. 



■] Clay containing few fossils. 80 feet. 

 ■] Sandstone and clay. 90 feet. 



BufT-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 fle.xistriatum, Evans and Shumard. 

 Pholadomya elegantula, " " 



Mytilus galpinianus, " " 



Avicula linguoeformis, " " 



" triangularis, " " 



" cretacea, Conrad. 

 Ostrea congesta, " 



" vesicularis, Lamarck (on the authority of M. 

 Nicollet's list). 

 Inoceramus Barabini, Morton. 



(= L Crispii.? Mantell.) 

 " sagensis, Owen. 



" Nebrascensis, Owen. 



Cytherea Missouriana, Morton. 

 Tellina occidentalis, " 



Cucullea Nebrascensis, Owen. 

 Anomia tellinoides, Morton. 

 Hypponix borealis, " 



