WA University of Kansas Geological Survey. 
Hill’s. Prosser’s. 
Thick Thickness Total 
Nos. ay Nos. ofeach  thick- 
ness. division. ness. 
Feet. Feet. 
Dark gray sandy and argillaceous shales, in.... 10 — 270 
places iron-stained, ‘containing selenite. 
2 10 7 Occasionally a friable sandstone. This 
layer contains the dicotyledonous leaf 
impressions. 
In the main light to yellowish gray friable.... 40 — 260 
sandstone. In places irregularly bedded, 
showing fine examples of cross-bedding. 
On weathering often dark brown and in 
places light yellowish or vermilion. The 
writer is confident that the thickness of 
this portion of the Cheyenne is not much 
greater than 40 feet. It was measured in 
1 57 6 the ‘‘ Natural Corral,’’ described by Pro- 
fessor Cragin, the sides of which gave 26 
feet, and then but a short distance away, 
to its top. This forms what Professor 
Cragin calls the ‘‘Corral Sandstone” 
named from this small canon known as 
the ‘‘ Natural Corral.’’ Base of the Chey- 
enne sandstone, first seen on the red butte, 
3% miles west of Sun City. 
I Partly covered slope. Red Bluff sandstone.... 65 —— 220 
1 5 of Cragin in upper part. Dog creek red 
shales of Cragin in lower part.! 
4 Massive gypsum,the Medicine Lodgegypsum.... 15 — 155 
Below massive gypsum, about 8 feet covered,.... 10 —— 140 
3 below which is a prominent iron-stained 
sandstone stratum. 
Mostly covered for 20 feet, but in the basea.... 20 — 180 
greenish-gray conspicuous stratum, with 
2 gypsum nodules, similar to the one seen 
in the Gypsum Hills, southwest of Medi- 
cine Lodge. 
a 
300 
Largely covered slope to the level of river..... 110 — 110 
1 “ Hlower-pot shales” of Cragin, Level of 
Medicine Lodge river. 
1 Up to the base of the Cheyenne sandstone the thickness was determined by the 
Aneroid barometer, and for the remainder of the section by the Locke level. The 
barometer gave only 65 feet from the top of the Medicine Lodge gypsum to the base 
of the Cheyenne on the red butte, three and one half miles west of Sun City, while 
on Walker creek, four miles northwest, carefully measured by tape and level, 
the thickness of the beds from the top of the massive gypsum to the base of the 
Cheyenne is 116 feet. However, the topographic map indicates only a thickness of 
230 feet for the barometric section of 220 feet, consequently, I consider this difference 
due to unequal erosion previous to the deposition of the Cheyenne. The thickness 
of 65 feet between the top of the gypsum and the base of the Cheyenne agrees closely 
with that given by Professor St. “John who reported the thickness of the intervening 
strata as 60 feet. The varying thickness of the beds between the gypsum and the 
base of the Cretaceous for this region was clearly stated by Professor St. John to 
be due to pre-Tertiary erosion and his comment on this particular region was as 
follows: ‘‘On the borders of Barber and Comanche counties, in the highlands south 
of the Medicine Lodge, the base of the Cretaceous occupies a still lower strati- 
graphical position on the Red-Beds (than in Clark Co.), occurring within 60 feet of the 
gypsum ledge, indicating the removal of quite 100 feet thickness more of Red-Beds 
strata in this quarter prior to the deposition of Cretaceous sediments”? (Fifth Bien- 
nial Report Kansas State Board Agriculture, p. 142, Topeka, 1887). ’ 
It will be seen from the above table that the total thickness of 
this section, which extends from the level of Medicine Lodge river 
at Sun City to near the top of Stokes hill five and one half miles 
