Prosser.|  Cretaceous.—Comanche Series of Kansas. 143 
Section of Avilla Hill. 
No. Cet 
(By ARETE LTTE IN ash SSNS eae ANA eS aU 14—266 
5. Arenaceous shales alternating with pinkish Ostrea 26—252 
limestone. 
4. Yellow fossiliferous shales. Large numbers of 90—226 
Gryphaea Pitcheri, Mort. — G. forniculata White. 
In the lower part rather coarse Cyprimeria shales 
alternating with blackish and yellowish shales. 
3. Mainly black shales, possibly thin streaks of yellow- 20—136 
ish shales in the upper part. Base of Kiowa 
shales. 
. In part very hard, quartzitic sandstone and some 6—116 
yellowish, reddish and brownish soft sandstone 
containing poorly preserved Lamellibranch 
shells. Cheyenne sandstone. 
1. Top of the Red-Beds; red shales and sandstones. 110—110 
Slope covered to a considerable extent. 
Level of Salt Fork. 
The above section gives a thickness of 142 feet for the Comanche 
series, the upper i136 feet of which belong in the Kiowa shales, 
while the variously colored sandstone at least 6 feet thick at the 
base is called Cheyenne. ‘To be sure the Cheyenne sandstone has 
not heretofore been identified to the southwest of the northeastern 
part of Comanche county; but this sandstone has the same variety 
of colors, is composed of rather coarse grains of quartz sand about 
like those of the Cheyenne and is found in the same stratigraphic 
position; bright red rocks below, while immediately above are 
black thin shales succeeded by coarser yellow to gray shales con- 
taining abundant Kiowa fossils. The great hardness of this stratum, 
in places becoming almost a quartzite, might be mentioned as an 
evidence of dissimilarity between these two sandstones; still this 
change from extreme friableness to great hardness is found in other 
sandstones of similar texture in Kansas as, for instance, in the 
Dakota which, in general, in Saline and McPherson is of a friable 
nature, but on South Twin Hill and the ridge in Bonaville township 
in the northeastern part of McPherson county, the sandstone is as 
hard as a quartzite. The other and greater argument against non- 
LS) 
