166 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 
as “ of flat-iron shape, with the broad end to the south resting upon the 
Kansas-Nebraska line. The northern limit is probably in the vicinity 
of Roca, Lancaster County. On the east the boundary has only been 
approximated, . . . but it is supposed that it extends from Roca south 
and east into Johnston County, thence southward through the western 
end of Pawnee County into Kansas. The western boundary, from Roca 
to Beatrice, is also buried beneath a very thick bed of loess, but from 
Beatrice southward it is traced with considerable accuracy.” An under- 
standing of the stratigraphic relations of the Upper Palaeozoic rocks in 
GEOLOGICAL MAP 
oF 
SOUTH-EASTERN 
NEBRASKA 
CoAt MEASURES, 
(es | PERMIAN 
DAKOTA GROUP 
L(t 
he 
ih 
| 
' | 
tr \ muy 
Tn TULA a tytlgy 
rey tipi 
4 al 1 It “tl lisrpal 
Fie. 1. 
A Geological Map of Southeastern Nebraska (after Knight). 
Nebraska will be facilitated by an inspection of the accompanying 
sketch-map and section, taken from Professor Knight’s article, and of 
the following table of formations. The stratigraphy of the Kansas 
Coal Measures is described in the report of the University Geological 
Survey of Kansas, particularly in Volume III. by E. Haworth. 
Nearly all of the fish-remains described in the present paper are 
from the Atchison shales, the principal localities being in Cass, Gage, 
Lancaster, Nemaha, and Sarpy counties. According to Dr. Barbour, 
the exposures at Cedar Creek, Louisville, South Bend, and Table Rock 
