348 The American Geologist. June, 1892 
prina limestone. The third, however, is a true peak in form, the 
hard limestone having been eroded from its top. Lower down 
the different beds of massive gypsum form benches around the 
side of the mountains and the clays which form their bases have 
been washed into innumerable canons which are often entirely 
impassable. 
Salt creek, a branch of the Double Mountain fork, is located 
about four miles east of the mountains. From this creek, which 
is the beginning of the ascent, to the summit of the highest peak, 
is by barometric measurement eight hundred and forty-five feet, 
of which amount three hundred and twenty feet are passed before 
the ascent of the mountain proper begins, giving it an elevation 
of five hundred and twenty-five feet above its immediately sur- 
rounding country. 
Climbing’ the successive ledges of sand, gypsum, clay and 
limestone until the summit of the mountain was reached, we ob- 
tained a view embracing many miles of the country. It stretched 
out before us gently undulating, open, without timber save here 
and there a scattering thicket of mesquite. The Salt fork to the 
north and the Double Mountain fork to the south wound their 
ways eastward toward their junction as slender threads of yelicw- 
ish red. Very few evidences of settlement were to be seen. On 
the flats were many water-holes filled by the recent rains, and cat- 
tle could be seen scattered here and there in all directions. To 
the svuth, probably as much as twenty-five or thirty miles, a 
series of flat topped hills were seen stretching along the horizon, 
while to the west, at avery considerable distance, there were 
three or four buttes of similar form to that on which we were 
standing, and which we took to be Mt. McKinzie and its neigh- 
bors. These were backed by the blue scarp of the Staked Plains. 
Kiowa peak, some thirty miles to the north, was invisible. 
GENERAL SECTION. 
Section of the eastern peak of Double mountain, beginning atthe top: 
ae 
|| 
2S ERs « ; } 
a 1. Caprinay limestone... eee eee Sone teste Ulan 
a + 2 Comanche Peak’series, ..)...0...1 een oe eee ee 
3 a +8. Drinity Gent eee ee ee tats ert 
a 
— 
B 
—~ -— 
J 8a. ‘Dockumey.cee eee ee Jca'ehthe seater ne Olin 
TRIASSIC 
