Idaho geologic maps
Cartahaven has 3 geologic maps of Idaho, 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 central Beaverhead Mountains, Lemhi County, Idaho, and Beaverhead County, Montana
USGS Scientific Investigations Map 3413
Geologic map of the north half of the Lake Walcott 30'×60' quadrangle, Idaho
USGS Scientific Investigations Map 3405
Surficial geology and Quaternary tectonics of the Madison Valley and fault zone, Madison, Gallatin, and Beaverhead Counties, southwest Montana, sheet 1
USGS Scientific Investigations Map 3508