A handsome and colorful map that illustrated the report of T.B. Comstock, the geologist to the Military Reconnaissance of the region that was conducted by Capt. W.A. Jones, Corps of Engineers. Shows fifteen classes of geology, the topography and trails in the northwestern part of Wyoming, including roads, stage stations, military posts, astronomical oberservation stations, and boundaries of the Snake Indian Reservation. Includes Jackson Hole, the Big Horn and Teton Mountains, and extends south to Fort Bridger and the Sweetwater Mountains. Terrific detail of the newly formed Yellowstone Park.

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Condition: B

Issued folding, now pressed and backed with archival tissue. Toned along two folds, else very good with fine coloring.