(Wyoming - Bighorns) Geologic Map of the Bighorn Mountains Wyoming
A beautiful map by one of USGS' mapping Hall of Fame, N. H. Darton. He's an interesting character in his own right, a renaissance man that was mostly self taught and brought on to work for the government by G.K. Gilbert. He did an amazing amount of mapping throughout the west with a particular strength in geology. This map reaches from the northern edge of Fremont county in Wyoming up to the Bighorn River in Montana.
Condition is very good. Image size is 37.5 x 20, full printed color