Badlands National Park’s eroded plains and fossil-rich cliffs
Published on 09/19/2026 at 08:18 | Editorial responsibility: Rafael MĂĽller, Editor-in-Chief AD HOC NEWS
Badlands National Park in South Dakota spreads across a broad expanse of eroded cliffs and mixed-grass prairie east of the Black Hills, with the small community of Interior close to its southern edge. The landscape exposes rock layers laid down between the Late Cretaceous and the Oligocene, giving the park an unusually visible cross-section of around 75 million years of geological history.geological history
Wall of buttes above the prairie
The core scenery of Badlands National Park is a long barrier of buttes, pinnacles and ridges that rises above the surrounding grasslands in southwestern South Dakota.barrier of buttes These forms have been carved from relatively soft sedimentary rocks by running water and wind, producing steep slopes, narrow gullies and freestanding spires. In many places the escarpment drops from a level prairie surface into a maze of deeply cut channels.
The rock faces show bands of different colours, including pale layers of volcanic ash, grey and tan mudstones, and seams where iron and manganese oxides lend orange or purple tones.bands of different colours Between the broken ground and the sky, these bands form stacked patterns that visitors see from road overlooks and short walking paths along the edge of the formations. Away from the cliffs, the mixed-grass prairie stretches out, giving long views towards distant butte ramparts.
Layers from sea muds to volcanic ash
The rocks in Badlands National Park preserve a sequence of environments, beginning with marine muds of the Western Interior Seaway and ending with river floodplains and ash deposits of the Oligocene.Western Interior Seaway The dark Pierre Shale at the base formed from sediments laid down in that shallow sea and contains fossils of marine animals such as ammonites and mosasaurs.Pierre Shale Above it lie weathered soils exposed as Yellow Mounds, followed by river and floodplain deposits of the White River Group.
Within this group, formations such as the Chadron, Brule and Sharps record changing climates and habitats between roughly 37 and 23 million years ago.Chadron, Brule and Sharps The uppermost Sharps Formation includes layers rich in volcanic ash that originated far to the west before settling over the Great Plains and hardening into tuff.volcanic ash Together, these formations form the banded slopes that characterise the park’s broken terrain and offer geologists clear exposures of sedimentary structures and fossil-bearing strata.
Fossil beds and protected prairie
Badlands National Park is known for extensive fossil beds that have yielded Oligocene vertebrates from an era when subtropical forests and later savannah covered what is now South Dakota.Oligocene vertebrates Finds include remains of three-toed horses, early camels, sabre-toothed carnivores and ancestors of the rhinoceros, among many other mammals that once lived on these floodplains.fossil mammals The exposed rock makes these fossil-bearing layers accessible to scientific study, while protected status limits disturbance.
The park also includes a large tract of mixed-grass prairie that supports grazing animals and birdlife across a relatively undisturbed plains ecosystem.mixed-grass prairie Scenic routes such as the Badlands Loop Road give access to viewpoints where the contrast between the broken badlands topography and the surrounding grasslands is clear, and short trails lead into the formations to modest elevations above the prairie floor.Badlands Loop Road
Visiting Badlands National Park: what travellers from Western Europe should know
- Badlands National Park lies in southwestern South Dakota, with the headquarters at Ben Reifel Road near Interior and road access from Interstate 90 and South Dakota Highways 240, 377 and 44.
- The terrain combines level prairie with steep, eroded slopes and gullies; paths from road overlooks may involve short but uneven walks over loose sediment and packed earth.
- The park is part of the United States National Park System and sits east of the Black Hills region; Rapid City is the nearest regional centre with commercial flights and major road connections.
- The official language is English and the currency is the United States dollar.
- Entry requirements depend on your nationality; UK travellers can check the FCDO travel advice at gov.uk/foreign-travel-advice, Irish travellers the Department of Foreign Affairs at ireland.ie.
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Frequently asked questions about Badlands National Park
Where is Badlands National Park located?
Badlands National Park lies in Jackson, Oglala Lakota and Pennington counties in southwestern South Dakota, east of the Black Hills and near Interior.southwestern South Dakota
What should visitors expect on a visit?
Visitors encounter badlands formations of eroded buttes and ridges beside extensive mixed-grass prairie, with road overlooks, short trails and fossil-rich rock exposures accessible by car and foot.road overlooks
What makes Badlands National Park distinctive?
The park combines one of the most complete accessible sequences of Late Cretaceous to Oligocene sedimentary rocks with rich fossil beds and a large protected area of mixed-grass prairie within the Great Plains.accessible sequences
