Colorado geologic maps
Cartahaven has 8 geologic maps of Colorado, all free. Georeferenced geologic maps from the U.S. Geological Survey: rock units, faults and structure.
Download one to your phone and the map app shows your GPS position on it with no cell signal.
Geologic map of the Fort Collins 30'×60' quadrangle, Larimer and Jackson Counties, Colorado, and Albany and Laramie Counties, Wyoming
USGS Scientific Investigations Map 3399
Geologic map of the Fort Morgan 7.5' quadrangle, Morgan County, Colorado, sheet 1
USGS Scientific Investigations Map 3408
Geologic map of the Homestake Reservoir 7.5′ quadrangle, Lake, Pitkin, and Eagle Counties, Colorado
USGS Scientific Investigations Map 3451
Geologic map of the Leadville North 7.5’ quadrangle, Eagle and Lake Counties, Colorado
USGS Scientific Investigations Map 3400
Geologic map of the Masters 7.5' quadrangle, Weld and Morgan Counties, Colorado
USGS Scientific Investigations Map 3344
Geologic map of the Pagosa Springs 7.5' quadrangle, Archuleta County, Colorado
USGS Scientific Investigations Map 3419
Geologic map of the Poncha Pass area, Chaffee, Fremont, and Saguache Counties, Colorado, sheet 1
USGS Scientific Investigations Map 3436
Geologic map of the San Antonio Mountain area, northern New Mexico and southern Colorado
USGS Scientific Investigations Map 3417