222 University of Kansas Geological Survey. 
dentalis, aud Baculites ovatus. Undetermined species are from the 
genera Ostrea, Corbula and Scaphites. 
A SECTION THROUGH THE CRETACEOUS FROM CLIFTON TO THE 
COLORADO LINE. PLATE XXX, FIGURE 1. 
Beginning at Peach creek a few miles east of Clifton, we find a bed 
of blue shales resting upon 6 feet of Permian limestone. Above a 
bed of sandy gypsiferous shales rests conformable with the blue 
shales. On the east side of Peach creek a line of Dakota sand hills 
rise to a height of 125 feet. These hills are composed of alternate 
layers of shale and sandstone and are invariably capped with from 
10) to 25 feet of sandstone. The surface west of Peach creek rises 
gradually to a height of 56 feet above the creek bed. The sandy 
character of the soil indicates that the formation is Dakota, but 
there are few outcrops. The wells of this locality pass through 
sand and shale to the upper surface of the Permian limestone, along 
the surface of which the water flows. 
Passing westward from Clifton to Clyde there are found a few 
outcrops of sandstone. The individual layers vary in thickness from 
2to3 feet. The sandstone is of a brown color and loosely textured. 
In a railroad cut east of Clyde the following condition of strati- 
graphy was exposed, numbering from the bottom of the cut: 
Sth, Soii, id feet. 
4th, Red sandstone, 10 feet, friable. 
3d, Blue clay, shale, 10 feet. 
2d, White sandstone, 23 feet, compact. 
Ist, Blue clay, 1 foot, nonfossiliferous. 
The valley of the Republican from Clyde to Concordia is bounded 
by the Dakota sandstone bluffs. These bluffs are composed of alter- 
nate layers of red or white sandstone and shale, and owe their 
preservation to the sandstone layer which rests upon them. West 
of Concordia the Upper or Lignite division of the Dakota is reached. 
The bluffs on each side of the river are capped with Benton lime- 
stone. The coal shafts at Minersville pass through 70 feet of gyp- 
siferous and saliferous shale, and reach two 9 inch veins of lignite, 
intercalated between beds of shale. On the bluffs above the mouths 
of the shafts, the Denton limestone rests, the intervening distance 
