t 
Record of Geology of Texas, ISS'Z.-ISQG. 61 
Cummins, W. F. 
the Peranian and Carboniferous formations, giving only such attention to 
the other memhers of the section as was necessary to determine the relation 
of the Permian and Carboniferous formations to the overlying and under- 
lying series, and to enable me to determine with accuracy the extent of 
these two formations in this part of the iState. 
On Plate VI, I have given a columnar section of the strata (higher than 
the Devonian) in northwestern Texas, with the provisional divisions which 
I have made of them.'’ Pp. 359-360. 
PLATE VI. 
{Without the conventional signs indicating the character of the deposits.) 
Thick- 
ness. 
DIVISIONS. 
Tertiary. 
200 
Blanco Canyon. 
Triassic. 
125 
Dockum. 
S3 
2075 
Double Mountain. 
a' 
<D 
1975 
Clear Fork. 
hLt 
1800 
Wichita. 
1180 
Albany. 
<D 
f.- 
13 
m 
c3 
840 
(Coal Bed No. 7.) 
Cisco. 
930 
Canyon. 
(U 
3000 
Strawn. 
o 
o 
lOOQ 
(Coal Bed No. 1.) 
Millsap. 
140 
Bend 
220 
‘‘The ^Silurian lies along the southwestern border of the iCarboniferous 
[P. 360. 
“The Devonian is entirely wanting along the lines of contact between 
the Cairboniferous and the older rock, so far as d have been able to deter- 
mine., I have not seen this formation anywhere in the 'State, yet it may 
exist.” P. 360. 
“r,rom all the evidence 'I have been ,able to secure in the course of my 
work in this district I am forced to the iconelusiion that up to the present 
no iSub-Carboniferous rocks have been discovered.” P. 367. 
Report of (for 1891). 
Second Report of Progress, Geological Survey of Texas,, 1891, 
pp. 27-42. Austin, 189'2. 
