National Natural Landmarks

The Castles

The Castles
The Castles

Steep-walled, flat-topped buttes standing 200 to 400 feet above the surrounding prairie, The Castles contains exposed rock of Upper Cretaceous, Paleocene, Oligocene, and Miocene Ages. Cretaceous and Tertiary beds contain a variety of flora and fauna fossils. The site is located within the Custer National Forest.

Location: Harding County, SD ; Harding County, SD

Year designated: 1976

Acres: 940

Ownership: Federal

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Please remember, National Natural Landmarks (NNLs) are not national parks. NNLs are owned by a variety of public and private entities and allowing visitation is at their discretion. Many NNL sites maintain public websites where additional information may be found.


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