178 University Geological Survey of Kansas. 
Comanche and base of the Tertiary was found to be as in the fol- 
lowing table: 
Mt. Jesus. Messing’s Bluff Mt. Jesus 
to to O 
Messing’s Bluff. Amphitheatre. Amphitheatre. 
Feet. Feet. Feet. 
Top of Day Creek dolomite.... 92 Pals eae 
ibascrolm@omancheran ya nNnear 112 65 9 
Basejof Tertiary. (oui. 16 124 14 
The Day Creek dolomite is the most constant line of those used 
in the above table and the 9 feet per mile may be regarded as a 
close approximation to the amount of southeast dip along the line 
of this section. The base of the Comanche is somewhat irregular 
due to the pre-Cretaceous erosion, for on Messing’s bluff there are 
20 feet of the Red-Beds between the base of the Comanche and the 
top of the Day Creek dolomite; while on the bluff farther southeast 
the dolomite in places was cut away, and on the south side of Mt. 
Jesus there are 8 feet of intervening Reds. This increased the 
amount of dip for the base of the Comanche between Messing’s 
bluff and Mt. Jesus. Again, the erosion of the upper part of the 
Comanche from the Amphitheatre to Mt. Jesus explains the much 
greater dip for the base of the Tertiary. 
Minaily, in the section for Kiger creek over Mt. Nebo to the 
prairie west of Letitia, in the western part of Clark county the 
thinning of the Comanche to the south is well shown. This section 
is along a north and south line and the dip is not nearly as great to 
the south as it is to the southeast in the previous section. The eleva- 
tions of the base of the Comanche and Tertiary were determined 
in this section on Mt. Nebo and on the hill between Chapman and 
Little sandy creeks. The data are given in the following table: 
Hill between 
Mt. Nebo. Chapman and 
Little Sandy creeks 
Feet. Feet. 
Jee Senonend Mexer men ayrae vayy MyMail tig Biel ch ol Seals Ol 2323 2405 
Baserol Comanche nee aun iy eee 2248 2260 
Mucknessiot Comanche a eee (5 145 
The distance between the two sections is five miles and the dip 
to the south for the base of the Comanche is two and two fifths feet 
per mile and for the base of the Tertiary sixteen feet per mile. 
The much greater dip for the Tertiary is due to the erosion of the 
