Double Mountain Section.—Dumbleand Cummins. 351 
i 4. Permian. 
Underlying the conglomerate last mentioned but separated by a 
bold unconformity we find five feet of shaly clay dipping toward 
the northwest. It is underlaid by a red or terra-cotta sandstone 
somewhat mixed with clay toward the top and bedded in layers 
which vary in thickness from one foot to an inch or less. There 
are one or two thin seams of impure limestone imbedded in the 
sand, but although most careful search was made for fossils none 
were found, 
5. Gypsum Beds, 
The red, or terra-cotta, sandstone rests directly upon the upper 
gypsum beds which consist of an upper layer of gypsum under- 
laid by yellow and red sandy clays or shales which are much cross 
bedded. Gypsum also occurs throughout the clays. 
6. Middle Gypsum Beds. 
These consist also of an upper layer of massive gypsum more 
than ten feet in thickness, which is underlaid by a series of red 
and blue gypsiferous clays and shales, 
7. Lower Gypsum Beds. 
Massive and shaly gypsum varying in color from white to rose 
red, underlaid by thin bedded sandy clays and shale with gypsum. 
There was some difference in dip noticed between the three beds 
of gypsum. However, with the amount of detritus which occurs 
on the side of the mountains and the constant suberosion whicn is 
going on, such appearances cannot be taken as representing the 
true dip of the beds, which all dip probably to the northwest, 
except the Triassic and Cretaceous which dip distinctly te the 
southeast. 
No beds were found which could in any way be referred to the 
Jurassic and since the accumulation of evidence seems to be in 
favor of the retention of the Trinity in the Cretaceous system in 
spite of the Jurassic affinities of certain of its ostrean forms it 
would seem that deposits referable to the Jura are entirely want- 
ing in Texas, at least east of the Pecos river. 
