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 reports, from railroad alinements and an 
files supplied by the Denver & Rio Grande Weste 
Railroad Co., and fro eSaeoomegie information a 
lected with the aiemncd of that company 
PREPARED UNDER THE DIRECTION OF 
GEORGE OTIS SMITH, DIRECTOR 
VID WHITE, Chief — C. H. Ler Piste Chief Topographic Engineer 
DA 
M. R. CAMPBELL, Geologis ROBERTS, Topographer 
1922 
EXPLANATION 
Age Thickness 
in feet 
B Gravel on mesas and terraces Pleistocene 
Conglomerate deposited by streams 
CG "(Castle Rock conglomerate) Tertiary (Oligocene) 300 
Arkosie (fragments of granite) ) 
D pea nan = (Dawson arkose) | 2,000 
oe hose ang = beds on page iced to = betula | 
a (Denver formation) 
Conglomerate, atc iy and shale | 
D. (Arapahoe formation) = 700 
Sandstone and shale with coal beds : 
G (Laramie fi ‘ormation) 1.200 
i Dark marine shale with sandstone { bp gn sandstone 8,000 
at top (Montana group) Upper Cretaceous 
| 
ce ort are —_ and limestone 1,000 
ua. Dakota sandstone 
M separated by shale ipees formation Lower Cretaceous °°” 
N payer rig ia sandstone Cretaceous? 200 
White and red sandstone, red ‘Lykins formation a i 
r shale and gypsum at top Lyons sandstone | ¢ bonif. yf 
Mainly white arkosie sand- | Pen ) 
stone (Fountain formation) a; 
rs Carboniferous 
i Mibu Hrentne (Mississippian 
quartzite Manitou limestone Ordovician 
sandstone Cambrian 
X Granite Pre-Cambrian 
Y Lava fiows (basalt and rhyolite) Tertiary 
ae Fault : 
' U. 8. GEOLOGICAL SURVEY 
707 SHEET No. 1 
105°30' 
COLORADO 
ie 
sor 
Scale 
Arrocinatly 8 yoru to | “~ 
> 0 Miles 
_ : ee 10 2 Kilometers 
Elevations in feet above mean sea level 
ee od amid - spaced | mile apart. 
eee shading by A. W. Berry 
39 : 26 ae ees 
105 30° Sheet No.2 
ENGRAVED wher om 
