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. 
Fia4. 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. 
: P Kiger shales 
c 
Ra ee ae Salt Fork shales 
Permian Wellington shales 
System Big Blue series Marion limestone 
Florence flint 
Chase limestone : 
Strong flint 
(“ Permo-Carboniferous ”’) Mencha whales 
Cottonwood limestone 
Carboniferous Atchison shales 
pycter Missourian series | Be eenestene 
(Upper part Platte shales 
only) Plattsmouth limestone 
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 NEewserry. 
1856. Diplodus compressus J. S. Newberry, Proc. Acad. Nat. Sci. Philad., p. 99. 
1866. Diplodus compressus Newberry and Worthen, Pal. Illinois, Vol. II., p. 60, 
PE iv, Fig: 2: 
1870. Diplodus compressus O. St. John, Proc. Amer. Phil. Soc., Vol. XI., p. 482. 
