Boars Tusk, Volcanic neck in Sweetwater County, United States
Boars Tusk rises 400 feet above Killpecker Creek plain, forming a dark lamproite rock formation against the surrounding sandy landscape.
The volcanic structure dates back 2.5 million years, representing the eroded remnants of an extinct volcano within the Rock Springs Uplift.
The geological formation holds importance for multiple indigenous groups, including the Shoshone, Arapaho, Ute, Shoshone Bannock, Lakota, Cheyenne, and Apsáalooké nations.
Visitors need a high-clearance vehicle to access the site via US Highway 191 to mile marker 10, followed by County 4-17 and the Boars Tusk access route.
The formation contains lamproite, an uncommon volcanic rock type, making it a notable geological study site in Wyoming's Green River Basin.
Location: Wyoming
GPS coordinates: 41.96278,-109.19722
Latest update: March 16, 2025 01:04
Wyoming features geological sites with thermal springs, canyons, and rock formations. The state preserves important historical locations including forts, rock art, and dinosaur tracks. The landscape includes waterfalls, mountains, and forests. Nature parks and trails allow exploration of these areas.
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