The Castles

USA / South Dakota / Buffalo /
 butte, geology, interesting place, natural monument, stone/rock feature, fossil site, National Natural Landmark
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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 and is designated a National Natural Landmark.
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Coordinates:   45°31'30"N   103°9'39"W
This article was last modified 4 months ago