Geology & Natural History

In 1843, explorer John C. Frémont reported coal in what’s now southwest Wyoming. In the 1860s, the route of the new transcontinental railroad across Wyoming was chosen partly to access abundant coal deposits for fuel for the locomotives. Coal mining boomed, labor strife increased and Wyoming’s coal industry thrived despite worker strikes and a number of horrific mine accidents. Today, the state produces 40 percent of the nation’s coal, most of it from huge strip mines in the Powder River Basin in northeast Wyoming, for rail shipment to electric power plants in 34 states.

Wyoming’s bone-dry Bighorn Basin is isolated by its surrounding mountains and watered by crucial rivers and streams. Its history and natural history are rich with discoveries of dinosaurs, oil and gas, and with the traces of its occupants—American Indians, ranch and farm families, railroad families and oil workers.

Samuel H. “Doc” Knight taught geology at the University of Wyoming in Laramie, Wyo. from 1916 until his retirement in 1963. For a decade he was the only geology teacher, but as his classes began to grow in size and popularity the geology department expanded into a nationally recognized program. He established the university’s science camp in the mountains west of Laramie and revitalized the university’s geological museum. Knight taught an estimated 10,000 students throughout his career and was known to many “Mr. Geology of Wyoming.”

The earliest people appear to have come to Wyoming from Asia about 11,000 years ago and archaeologists now think there’s a good chance the people were direct ancestors of Shoshone people who live in Wyoming now. In recent years, the mostly white archaeologists have realized it makes sense to ask Shoshone people for help understanding the pictures and carvings their ancestors left on the rocks.

Medicine Lodge State Archaeological Site, northeast of Hyattville, contains pictographs and petroglyphs left by Wyoming’s ancient people, as well as an attractive, state-run campsite and small museum. Archaeologists have found evidence at the site of human habitation stretching back 10,000 years.

Created in 1911 and named for President Abraham Lincoln, Lincoln County is perhaps best known for its extraordinary geological history, showcased at Fossil Butte National Monument. The county seat, Kemmerer, Wyo., is the site of the first store opened by James Cash Penney, founder of J. C. Penney & Co., a business that still operates nationally today. Agriculture, mining and oil and gas industries continue to spur the county’s economy.

Legend Rock, about 30 miles northwest of Thermopolis, Wyo., features nearly 300 images carved or pecked into a rock cliff by ancient peoples over thousands of years.

Seminoe and Kortes dams, both located in a remote stretch of northern Carbon County, Wyo., were constructed in the 1930s and 1940s primarily for the production of hydropower. While power plants at both dams still generate electricity, the area is frequented by tourists, especially fishermen who travel to the renowned Miracle Mile, just downstream from Kortes Dam, to catch trout.

Boysen Dam, named for local businessman Asmus Boysen, was constructed on the Wind River in the 1940s to control flooding and to provide irrigation water for agricultural purposes. The dam was completed in early 1953 and its power plant continues to generate electricity today. Boysen Reservoir provides recreational opportunities as well.

The abundant vertebrate fossils of the Green River formation in western Wyoming have been known to science since the 1860s. Most are fish, buried in lime-rich mud at the bottom of freshwater lakes about 50 million years ago. Fossil Butte National Monument, west of Kemmerer, Wyo. was created by Congress in 1973 to protect a site extremely rich in these fossils.