Chadron Formation is a rock formation in

North Dakota North Dakota () is a U.S. state in the Upper Midwest, named after the indigenous Dakota Sioux. North Dakota is bordered by the Canadian provinces of Saskatchewan and Manitoba to the north and by the U.S. states of Minnesota to the east, S ...

South Dakota South Dakota (; Sioux language, Sioux: , ) is a U.S. state in the West North Central states, North Central region of the United States. It is also part of the Great Plains. South Dakota is named after the Lakota people, Lakota and Dakota peo ...

, northwestern

Nebraska Nebraska () is a state in the Midwestern region of the United States. It is bordered by South Dakota to the north; Iowa to the east and Missouri to the southeast, both across the Missouri River; Kansas to the south; Colorado to the so ...

, and eastern

Wyoming Wyoming () is a state in the Mountain West subregion of the Western United States. It is bordered by Montana to the north and northwest, South Dakota and Nebraska to the east, Idaho to the west, Utah to the southwest, and Colorado to the sou ...

. It is named after the town of

Chadron, Nebraska Chadron ( ) is a city and the county seat of Dawes County, in the state of Nebraska in the Great Plains region of the United States. The population was 5,851 at the 2010 census. This city is the location of Chadron State College. Chadron also ...

. It was mapped out by

Carl Vondra Carl may refer to: * Carl, Georgia, city in USA * Carl, West Virginia, an unincorporated community *Carl (name), includes info about the name, variations of the name, and a list of people with the name * Carl², a TV series * "Carl", an episode of ...

in the 1950s.

References

Paleogene geology of North Dakota Paleogene geology of South Dakota Paleogene Colorado Paleogene geology of Nebraska Paleogene geology of Wyoming {{NorthDakota-geo-stub