GEOLOGIC AND TOPOGRAPHIC MAP 
RIO GRANDE ROUTE 
From Denver, Colorado, to Salt Lake City, Utah 
ee from United States Geological Survey atlas 
shee ; 
files supplied by the Denver & Rio Grande Western 
d 
ets and reports, from railroad alinements and pro- 
i Co., and from sentbeape Roo agaryy col- 
any 
lected with the assistance of that c 
DAVID WHITE, Chief Geologist 
M. R. CAMPBELL, Geologist 
PREPARED UNDER THE DIRECTION OF 
GEORGE OTIS SMITH, DIRECTOR 
C. ROBERTS, Topograp 
C. Hi. en ae Chief Topographic Engineer 
her 
1922 
EXPLANATION 
Age Thickness 
in feet 
| ae hey were during the Great Ice Age Pleistocene 
BG Pleistocene or 
ravel, sand, and clay late Terti 
J Dark marine shale (Mancos shale) 2,300+ 
Upper Cretaceous 
M Brown sandstone (Dakota sandstone) | 80+ 
N Variegated shale and sandstone (Gunnison formation) Cretaceous (?) and =. 25 
Jurassic 
P  Brick-red sandstone Triassic 1,200+ 
R Red sandstone and shale (Maroon formation) ) 1,900 
i ors sates ) 
S Red sandstone, conglomerate. d shale( Weber f: ti )| hapa en 4,000 
U Blue limestone (Leadville li Ouray li ) apa se 08 w 
le limestone, Ouray limestone (Mississippian) 150 
d Devoni 
(Parti g quartzite | 
V Limestone and hicepanae ag estone | Ordovician and = 
quartzite | Lower quartzite (Sawatch seas ~ 
quartzite) 
X Granite Pre-Cambrian 
Y Lava flows (basalt) Tertiary 
owe Fault 
The limestone of lower Garboniferous ( oneness and Devonian age in the 
me as the Leadville limestone 
pe on of Golorado River is called Ouray limestone, but it is approximately 
e 
U. S. GEOLOGICAL SURVEY 
39'-—_—__ 
2” Basalt Mins”. //feg 
a 
10600 
06°30" 
BULLETIN 707 SHEET No. 4 
COLORADO 106° 
ye iz ee * e 
eas Sd 
scat 8 pi to 
4 Em, ? 
1 - 
10 Miles 
0 . 10 
L 
3 Kilometers 
aoa 
eae: in feet above mean sea level 
Colorado 
Relief shading by A. W. Berry 
7S crossties on the railroads are oo ? mile apart. 
P 
j at 
AW" it 
2. SS 
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