U. S. GEOLOGICAL SURVEY BULLETIN 707 SHEET No. 5 
108 107"30 _COLORADO 
I eT = 
GEOLOGIC AND TOPOGRAPHIC MAP 
OF THE 
RIO GRANDE ROUTE 
From Denver, Colorado, to Salt Lake City, Utah 
Compiled from United States Geological Survey atlas 
sheets and re , from railroad alinements and pro- 2 
files supplied by the Denver & Rio Grande Western ee 
Railroad Co., and from additional information col- i 
lected with the assistance of that company 
PREPARED UNDER THE DIRECTION OF 
GEORGE OTIS SMITH, DIRECTOR 
DAVID WHITE, Chief Geologist Cc. H. BIRDSEYE, Chief Topographic Engineer 
i er 
Sheet No. 
M. R. CAMPBELL, Geologist A. C. ROBERTS, Topograph 
1922 
EXPLANATION 
Age Thickness 
in feet 
E White shale and sandeteme (Green River formation) Tertiary (Eocene) 2,600 | 
F Red shale, sandstone, and gl (W: h f ion) Tertiary (Eocene) 3,400 | 
H Sandstone, shale, and coal beds (Mesaverde formation) } 5,000 
| 
| N 
J Dark marine shale (Mancos shale) >Upper Cretaceous 5,000 ss P 
M Brown sandstone (Dakota sandstone) J 100+ % 
<= 
G 
N Variegated shale and sandstone (Gunnison formation) Cretaceous (?) and = 95) 
Jurassic 
P  Brick-red sandstone Triassic 1,200+ 
R Red sandstone and shale (Maroon formation) Carboniferous 1,900 
(Pennsylvanian) 
S Red ; Carboniferous 
sandstone, conglomerate, and shale (Weber formation) (Finmaniionatan’ 4,000 
F rf " Carbonif Scale 500,000 
U Blue limestone (Leadville limestone, Ouray limestone) ( Gdlcaiosignian) 150 Approximately 8 miles to | inch 
and Devonian 0 5 10 Miles 
VY Quartzite, shale, and some limestone Cambrian 490 0 5 10 15 Kilometers 
ae a 
X Granite ; Pre-Cambrian Dida’ fond 
Ys Lava flows (1 it) Terti The distances from Denver. Colorado. h 10 
jis 
The crossties on the railroads are spaced i mile apart. 
———— Fault 
Relief snading by PR. W. Berry 
The limestone of lower Garboniferous (Mississippian) and Devonian age is 
called Ouray limestone, but Ouray and Leadville proximately th 
J ap 
