. S. GEOLOGICAL SURVEY 



BULLETIN 707 SHEET No. 



GEOLOGIC AND TOPOGRAPHIC MAP 



OF THE 



RIO GRANDE ROUTE 



From Denver, Colorado, to Salt Lake City, Utah 



Compiled from United States Geological Survey atlaa 

 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 



EXPLANATION 



Age Thickni 



in fee 



E Whit« afaale and sandstone (Green River formation) I 2,600 



I Tertiary 



F Red efaale and sandstone ^Wasatch formation) 



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



J Dark marine shale (Hancos ahale) 



M Brown sandstone < Dakota sandstone) 



feet 



I (Eocene) 



3.400 



^ Upper Cret&ceouB 3.000 



Va^a,^*.^ oV.«i« ( (McElmo formation and La Plata „ ^ .... . 



Variegated shale i „nd.,„np_ «„iivBlent to Cretaceous f?) and 



