PRossEeR.|  Cretaceous.—Comanche Series of Kansas. NT 
well as toward the south on the southern side of the high prairie in 
the banks of Mule creek. It will be noticed that the lower line of 
the Comanche is quite regular, but that the upper runs down rapidly 
both to the north and south. This indicates the extensive erosion 
previous to the deposition of the Tertiary, which had left a 
country of diversified topographic features, composed of hills and 
valleys. In even a more striking manner the section farther west 
from Avilla Hill northeast to Belvidere across the central part of 
Comanche county and southeastern part of Kiowa, shows the local 
thick beds of the Comanche, thinning out in a short distance to 
almost nothing. This is very conspicuous on the big hills south- 
west of Belvidere, where the Comanche is 163 feet thick; while on 
he southern side, the upper surface descends very rapidly toward 
Mule creek, so that from there to the edge of the bluffs north of Salt 
Fork the Tertiary has nearly replaced the Comanche. On the 
south side of the Salt ork the Comanche again appears with nearly 
its greatest Kansas thickness. This section affords an excellent 
example of the great plains pre-Tertiary erosion, and the uncon- 
formity by erosion of the Cretaceous and Tertiary. 
The next section to the west, Fig. 7, in the eastern part of Clark 
county, from Sitka northwest over Mt. Jesus, Messing’s Bluff and up 
the eastern bank of Bluff creek, shows the Comanche as thickest in 
the Bluff creek region and thinning to the north and south. The 
general direction of this section is from the northwest to the south- 
east and the dip was determined with reference to three strati- 
graphic lines, showing it to be southeasterly. The elevations of these 
horizons are as follows on Mt. Jesus, Messing’s bluff and the Amphi- 
theatre: 
Top of 
Base of Base of Thickness Day creek 
Tertiary. Comanche. of Comanche. do!omite. 
MUG, KESUSois wicio poe ae Sige 2220 ZIBS 85 2127 
Messing’s Bluff......... 2300 2194 106 2174 
AMT OAV NENTS) 450 0000000 2370 2230 140 Ee 
The distance from Mt. Jesus to Messing’s Bluff is five miles, 
from Messing’s Bluff to the Amphitheatre five and one half miles 
or from Mt. Jesus to the Amphitheatre ten and one half miles. 
The dip per mile of the top of the Day Creek dolomite, base of the 
—12 
