U. S. GEOLOGICAL SURVEY 



BULLETIN 707 SHEET No. 6 



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 pro- 

 files supplied by the Denver & Rio Grande Western 

 Railroad Co., and from additional information col- 

 lected with the assistance of that company 



PREPARED UNDER THE DIRECTION OF 

 GEORGE OTIS SMITH, DIRECTOR 



1922 

 EXPLANATION 



Age ThickTieBS 



in feet 



White shale and sandatone iGreen River formationt Tertiary lEocene) 2.600 



Red shale, sandstone, and conelomerateCWaaatch formation) Tertiary iEocetie) 3,400 



H Sandstone, shale, and coal beds (Mesaverde formation) 



J Dark marine shale <Mancos shale) 



M Brown sandstone (Dakota sandstone) 



N VarJegsted shale and sandstone (Gunnison formation) 



P Brick-red sandstone 



R Red sandstone and shale I Maroon formation ) 



S Red sandstone, conglomerate, and shale I Weber formati 



U Blue limestone (Leadville limestone, Ouray limestone) 



V Quartute. shale, and some limestone 

 X Granite 



Y Lava flows (basalt) 

 Fault 



5.000 

 /Upper Cretaceous 6.000 

 I 100± 



Cretaceous (?) and 



Triassic 



Carboniferous 

 ( PcnTtsi/ivanian 



Carboniferous 

 and Devonian 

 Cambrian 



Pre-Cambrian 



Tertiary 



260 



1.200± 



