Prosser.|  Cretaceows.—Comanche Series of Kansas. LAs 
Section of Little Basin at its Southwest Corner. et 
Cer 
Tertiary sandstone forming upper part of wall of cliff 25—63 
which rises considerably higher to the south. 25 
feet exposed in the Basin. 
Yellowish shales containing some fossils............ 15—38 
Thin black argillaceous shales representing the lower 18—25 
part of the Kiowa. Base of Kiowa. 
Yellowish coarse-grained, friable, sandstone, Big 10—10 
Basin sandstone of Cragin. 
The Big Basin sandstone as exposed in Little Basin, and espe- 
cially in the draws between Little and Big Basins, closely re- 
sembles in its lithologic characters the Cheyenne sandstone, the 
characters being similar to those noticed on Biluif creek above 
Messing’s, and at other localities in the northern and eastern parts 
of Clark county. 
A short distance west of Little Basin is the very much larger 
depression known as Big or Great basin. This is an oblong, sunken 
valley surrounded by steep walls, which on the eastern and northern 
sides are nearly perpendicular and from 130 to 150 feet in height. 
The floor of the basin is almost perfectly level, grassed over and 
without exposures of rock. The walis of the basin are composed in 
part of rocky cliffs, those of the western and northern sides belong- 
ing mostly to the Tertiary, which also forms the upper part of the 
eastern wall below which is the heavy-bedded sandstone, named 
Big Basin sandstone that rests upon the top of the Red-Beds. 
The Big Basin sandstone as exposed in the eastern side of the Big 
basin is a massive yellowish, brownish and whitish, friable, sand- 
stone which in all its general characters agrees closely with the 
‘Cheyenne. In places above the sandstone is a thin remnant of the 
KKiowa shales, the remainder of the upper part of the wall being 
Tertiary. Below the Big Basin sandstone are the Red-Beds the 
line of separation being at times quite sharp, but here and there 
the colors of the two blend. This is especially noticeable in the 
southern part of the eastern side of the Basin where the top of the 
Red Beds changes gradually into the Cheyenne. At one place there is 
a wall of hed Beds several feet in thickness covered by yellowish 
sandstone, followed by a band of red, in turn succeeded by the main 
ee 
by 2 
re 
