The Bighorn Basin is a

plateau In geology and physical geography, a plateau (; ; : plateaus or plateaux), also called a high plain or a tableland, is an area of a highland consisting of flat terrain that is raised sharply above the surrounding area on at least one side. ...

region and intermontane basin, approximately 100 miles (160 km) wide, in north-central

Wyoming Wyoming ( ) is a landlocked U.S. state, state in the Mountain states, Mountain West subregion of the Western United States, Western United States. It borders Montana to the north and northwest, South Dakota and Nebraska to the east, Idaho t ...

in the

United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

. It is bounded by the Absaroka Range on the west, the Pryor Mountains on the north, the Bighorn Mountains on the east, and the Owl Creek Mountains and Bridger Mountains on the south. It is drained to the north by tributaries of the Bighorn River, which enters the basin from the south, through a gap between the Owl Creek and Bridger Mountains, as the Wind River, and becomes the Bighorn as it enters the basin. The region is semi-arid, receiving only 6–10 in (15–25 cm) of rain annually. The largest cities in the basin include the Wyoming towns of Cody, Thermopolis, Worland, and Powell.

Sugar beet A sugar beet is a plant whose root contains a high concentration of sucrose and that is grown commercially for sugar production. In plant breeding, it is known as the Altissima cultivar group of the common beet (''Beta vulgaris''). Together with ...

s, pinto beans, sunflowers, barley, oats, corn and alfalfa hay are grown on irrigated farms in the region.

History

The basin was explored by John Colter in 1807. Just west of Cody, he discovered geothermal features that were later popularly called " Colter's Hell". The region was later transversed by the Bridger Trail, which was blazed in 1864 by Jim Bridger to connect the

Oregon Trail The Oregon Trail was a east–west, large-wheeled wagon route and Westward Expansion Trails, emigrant trail in North America that connected the Missouri River to valleys in Oregon Territory. The eastern part of the Oregon Trail crossed what ...

to the south with

Montana Montana ( ) is a landlocked U.S. state, state in the Mountain states, Mountain West subregion of the Western United States. It is bordered by Idaho to the west, North Dakota to the east, South Dakota to the southeast, Wyoming to the south, an ...

. The route was an important alternative to the Bozeman Trail, which had crossed the Powder River Country, but had been closed to white settlers following Red Cloud's War. Around the turn of the 20th century the Bighorn Basin was settled by ranchers such as William "Buffalo Bill" Cody who founded the town of Cody and owned a great deal of land surrounding the Shoshone River. The

Chicago, Burlington and Quincy Railroad The Chicago, Burlington and Quincy Railroad was a railroad that operated in the Midwest, Midwestern United States. Commonly referred to as the Burlington Route, the Burlington, CB&Q, or as the Q, it operated extensive trackage in the states of ...

extended a branch line to Cody in 1901 and ultimately built through the entire basin. In 1904, Cody helped to form the Shoshone project, the nation's first federal water development project to help irrigate the western portion of the basin. The project culminated in the construction of the Buffalo Bill Dam and reservoir. The wealth in the region also attracted outlaws.

Butch Cassidy Robert LeRoy Parker (April 13, 1866 – November 7, 1908), better known as Butch Cassidy, was an American train robbery, train and bank robbery, bank robber and the leader of a gang of criminal outlaws known as the "Butch Cassidy's Wild Bunch, ...

lived near Meeteetse for a while and was arrested at the insistence of local cattle baron Otto Franc and sent to the Wyoming State Penitentiary for horse theft. Following his release, he formed the Wild Bunch gang which operated from the Hole-in-the-Wall area southeast of the Bighorn Basin. In 1942 one of the nation's ten

Japanese American are Americans of Japanese ancestry. Japanese Americans were among the three largest Asian Americans, Asian American ethnic communities during the 20th century; but, according to the 2000 United States census, 2000 census, they have declined in ...

internment camps was located in Park County in the western part of the basin. The camp was named Heart Mountain Relocation Center, after nearby Heart Mountain. The camp operated until 1945, and at its peak detained over 10,000 internees.

Geology

The Bighorn Basin forms a geologic structural basin filled with more than of sedimentary rocks from

Cambrian The Cambrian ( ) is the first geological period of the Paleozoic Era, and the Phanerozoic Eon. The Cambrian lasted 51.95 million years from the end of the preceding Ediacaran period 538.8 Ma (million years ago) to the beginning of the Ordov ...

Miocene The Miocene ( ) is the first epoch (geology), geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and mea ...

in age. Since the early 20th century the basin has been a significant source of petroleum, and has produced more than of oil. The principal reservoir of oil is the Pennsylvanian Tensleep Formation; Other important petroleum horizons are the Mississippian Madison Limestone, Permian Phosphoria Formation and the

Cretaceous The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the ...

Frontier Sandstone. Some

uranium Uranium is a chemical element; it has chemical symbol, symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. Ura ...

has been mined in the northern part of the basin, along the Bighorn Mountains. The eastern section of the basin is famously rich in

fossils A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved ...

, with formations such as the Cretaceous period Cloverly Formation yielding numerous dinosaur fossils. The alluvial strata of the Willwood and Fort Union Formations of the Bighorn Basin contain a well-documented record of the Paleocene-Eocene Thermal Maximum (PETM). Analysis of

paleosol In Earth science, geoscience, paleosol (''palaeosol'' in Great Britain and Australia) is an ancient soil that formed in the past. The definition of the term in geology and paleontology is slightly different from its use in soil science. In geo ...

s here shows that the Bighorn Basin became more arid during the PETM, with wet/dry cycles superimposed over this general increase in aridity. These changes in environment are coupled with changes in paleoecology.

Communities

Notable Features

* Red Gulch Dinosaur Tracksite * Bighorn Canyon National Recreation Area

References

{{Authority control Plateaus of the United States Geology of Wyoming Sedimentary basins of North America Landforms of Big Horn County, Wyoming Landforms of Park County, Wyoming Landforms of Hot Springs County, Wyoming Landforms of Washakie County, Wyoming

History

Geology

Communities

Notable Features

See also

References