EASTMAN: CARBONIFEROUS FISHES FROM THE CENTRAL WEST. 167 



may be referred to the summit of the Atchison, and those at Richfield 

 and Springfield to its base. At Manhattan, Kansas, both the Atchison 

 and Cottonwood are exposed. 



Fig. 2. 



A Geological Section of the Nebraska Permo-Carboniferous south and east from 

 Beatrice to the Kansas line (after Knight). 



SECTION OF THE UPPER PALAEOZOIC IN KANSAS AND 



NEBRASKA. 



Permian 

 System 



( Cimarron series 



Big Blue series 

 ^ (" Permo-Carboniferous ") 



( Kiger shales 

 ( Salt Fork shales 



r 



Wellington shales 

 Marion limestone 

 Chase limestone 

 Neosho shales 



( Florence flint 

 ( Strong flint 



Carboniferous 



System 



(Upper part 



only) 



Missourian series 



\ 



Cottonwood limestone 

 Atchison sliales 

 Forbes limestone 

 Platte shales 

 Plattsmouth limestone 

 I Lawrence shales 



With these general remarks, we may now pass on to a consideration 

 of the fish-fauna of the Kansas-Nebraska area in systematic order. 



ELASMOBRANCHII. 



PLEURACANTHIDAE. 



Pleuracanthus (Diplodus) compressus Newberrt. 



1856. Diplodus compressus J. S. Newberry, Proc. Acad. Nat. Sci. Philad., p. 99. 

 18G6. Diplodus compressus Newberry and Worthen, Pal. Illinois, Vol. II., p. 60, 



PI. IV., Fig. 2. 

 1870. Diplodus comjiressus 0. St. John, Proc. Amer. Phil. Soc, Vol. XL, p. 432. 



