156 University of Kansas Geological Survey. 
with the coarser Kiowa above, upon which rests the Tertiary. The 
light colored cliffs above the upper line of trees in the highest part 
of the picture belong in the upper division of the Tertiary. 
Three miles above the Amphitheatre and near the old Vauheim 
post office the course of Bluff creek turns westerly. This point is 
near the termination of the narrow valley which has been termed 
the cafion of Bluff creek. Along the bluffs above the Amphitheatre 
the Kiowa shales are well shown until near Vauheim. Their upper 
limit passes below creek level somewhat west of this locality on 
Section 14, Township 30 S., Range 23 W. On the map the Kiowa 
shales are shown as a blue rock extending northerly along the 
narrow valley of Bluff creek, to the northern part of the ‘county 
to within about two miles of the Clark-Ford county line. 
Near the lower end of Bluff creek cafion, Hackberry creek 
enters from the west. The sides of this creek are very steep and 
its narrow valley thus forms a lateral canyon to the west of the 
main one. On the south side of this creek, between two and three 
miles southwest of Messing’s house the thickness of the Kiowa 
shales was measured. At the bottom of the section and consider- 
ably higher than creek level is a yellowish to whitish sandstone 
which is supposed to represent the same sandstone that occurs in 
the Big basin near the western edge of Clark county and to which 
Professor Cragin gave the name of Big basin sandstone. 
Section of Hill South of Hackberry Creek. 
No. Feet. 
4, Upper part Tertiary grit. 
3. Yellowish shales with some arenaceous layers. At 55—135 
the base is a sandstone the thickness of which 
was not determined. This sandstone seems to 
occur near the same horizon as the one in the 
Amphitheatre section (No. 2 of that section). 
Thickness 55 feet. 
2. Yellowish shales in the upper part changing to 80—80 
mainly blackish in the lower part. Thickness 80 
feet. 
1 Colorado College Studies, vol. VI, p. 46. 
