| Gunsight Mountain | |
| Elevation Ft: | 9263 |
| Elevation Ref: | [1] |
| Prominence Ft: | 2312 |
| Part Type: | Protected area |
| Part: | Glacier National Park |
| Country: | United States |
| State: | Montana |
| Region: | Flathead |
| Region Type: | County |
| Map: | Montana#USA |
| Relief: | 1 |
| Range: | Lewis Range |
| Coordinates: | 48.6147°N -113.7683°W[2] |
| Topo: | USGS Lake McDonald East |
| First Ascent: | Lyman Sperry (1905)[3] |
Gunsight Mountain (9263feet) is located in the Lewis Range, Glacier National Park in the U.S. state of Montana.[4] Gunsight Mountain is named after the adjacent Gunsight Pass, which was named by George Bird Grinnell in 1891.[5]
Like other mountains in Glacier National Park, Gunsight Mountain is composed of sedimentary rock laid down during the Precambrian to Jurassic periods. Formed in shallow seas, this sedimentary rock was initially uplifted beginning 170 million years ago when the Lewis Overthrust fault pushed an enormous slab of precambrian rocks 31NaN1 thick, 50miles wide and 160miles long over younger rock of the cretaceous period.[6]