U. S. GEOLOGICAL SURVEY 
BULLETIN 707 SHEET No. 2 
fics 30° 
3 
se 
_!04/30° COLORADO 
i No.1 
GEOLOGIC AND TOPOGRAPHIC MAP 
OF THE 
RIO GRANDE ROUTE 
From Denver, Colorado, to Salt Lake City, Utah 
Compiled from United States Geological Survey sy 
s 
1 
Scale 500,000 
Approximately 8 miles to | “age 
5 10 Miles 
15 Kilometers 
i 1 
0 5 
Elevations in feet above mean sea Jevel 
10 
i 
The di: nh ris ae ‘. nian 
The crossties on the railroads are spaced ! mile apart. 
n ee information col- 
lected with the Nantatadics of that company 
Relief shading by R. W. Berry 
PREPARED UNDER THE DIRECTION OF 
GEORGE OTIS SMITH, DIRECTOR 
DAVID WHITE, Chief Geologist C. H. BIRDSEYE, Chief Topographic Engineer 
M. R. CAMPBELL, Geologist A. C. ROBERTS, Topographer 
1922 
EXPLANATION 
Age Thickness 
“ in feet 
8B Gravel on mesas and terraces d pm oy ee and 
L late Tertiary 
Arkosic (fragments of granite) conglomerate Tertiary 
D Dewon arkose) (Eocene) = 
G Oa i shale with coal beds (I —" Pre 1.200 
| 
Dark marine shale with | 
| sobdvtone at top (Montana {Box Hie andetone| 8,000 
Ji Dark 1 
marine shale and limestone (Colorado or y seme 1,000 
K (a) Cal 1 (Wink 600+ 
| Carlile shale 
- = E> 400 
M Two ae conaetenes separated by! Dakota sandstone 400 
ee formation Lower Cretaceous 
N ie ie es ee a a £ + Cc : ? 205+ 
White red , red shale fi Lykins formation | : 
Carbonif: 
T het eee, eed e and con- Lene ee a mian (2) and 5,000 
z (Fountain formation) | Pennsylvanian) 
Millsap limestone Carboniferous | 
i f ove : (Mississippian) 
Limestone and pee, ey mt come 15 ; \ 490+ 
} Maatten Nesestona./ Ordovician = [ 
| Sawatch sands Cambrian J 
Xx Granite Pre-Cambrian 
La 
Y a. init mpd and en — Tertiary 
ee nee ae Fault 
* The Colorado group is cpr gir _ two parts, (a) and (b), in the south- 
eastern part of the area; in other parts the outcrop is too narrow to make 
such a jentncceen pratibehie 
CRIPPLE a ~~ 
CREEK “AX 
eS 
) 
ZA wv row 
Ora : 
—— 
8m 
ERGGAvED ANG PRRTED Sr TE U.S GRCIORION Saver 
