Geology & Natural History

Tribal sovereignty, retained by the Eastern Shoshone and Northern Arapaho since before Wyoming statehood,governs wildlife conservation on the more than two million acres of tribal lands on the Wind River Indian Reservation. Game populations have increased steadily since a tribal game code was adopted in 1984. 

In 1869 and 1871, John Wesley Powell led two expeditions from Wyoming Territory down the Green and Colorado rivers. These and other explorations brought him to a profound understanding of how the West’s aridity limits its economic prospects. He directed the U.S. Geological Survey from 1881-1894, and his ideas still affect land and water policy today. 

Mountaineer Finis Mitchell shared his love of the Wind River Range through postcards, public talks and a famed, hip-pocket hiking guide. He ran a fishing camp, worked on the railroad, stocked mountain lakes with fingerling trout and served in the Wyoming House of Representatives. Mitchell Peak was named in his honor. 

Recent, surprising discoveries including a prehistoric village in the Wind River Range above Dubois, Wyo., suggest humans—most likely ancestors of today’s Shoshone people—lived high-mountain lives as long as 10,000 years ago. 

Three total solar eclipses have crossed Wyoming since territorial times—in 1878, 1889 and 1918. Two in particular drew prominent astronomers and scientific discoveries. These are especially interesting now, with the August 21, 2017 eclipse likely to draw huge crowds to a very different Wyoming from the one that last saw moon shadows in daytime.

No logging, no grazing—even no trespassing? The Yellowstone Timber Land Reserve, the first land to be set aside in what evolved into today’s National Forest system, had a distinctly different character from its successors. Here’s why.

Iced drinks on the Oregon Trail? Early emigrants refreshed at the fabled Ice Springs near the Sweetwater River—now known as Ice Slough. But after a decade of trailside chopping and trampling, the spot became less attractive. Later travelers felt deceived by the stories they had heard.

Mixed-race families in early Wyoming appear to have sold oil skimmed from seeps to travelers on the emigrant trails, who used the oil to lubricate their wagon axles. It was a small start for what has become the huge petroleum business, so important to Wyoming today.

Natrona County’s Salt Creek Field is best known of Wyoming’s early oil fields, but five others—two in Park County and one each in Hot Springs, Niobrara and Converse counties—played important roles in the state’s 20th century transformation from an agricultural to an industrial economy.