Wyoming geologic maps
Cartahaven has 3 geologic maps of Wyoming, 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

Map of sand and gravel mines, prospects, and occurrences, and the geologic units that host them in the Wyoming Landscape Conservation Initiative (WLCI) study area, southwestern Wyoming
USGS Open-Fil

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