Badlands National Park’s eroded cliffs and ancient fossils

Badlands National Park near Interior in South Dakota sets jagged cliffs against sweeping prairie, where layered rock records millions of years of geological history.

Badlands National Park in South Dakota lies near the small community of Interior and stretches across a wide swathe of the Northern Great Plains, where eroded cliffs rise abruptly above mixed-grass prairie. This landscape combines sharply sculpted rock formations with broad open grasslands, and its exposed layers record tens of millions of years of geological change.

Layered rock revealing 75 million years of history

The rocks exposed in Badlands National Park preserve a sequence of sedimentary layers that were deposited over roughly the past 75 million years as environments shifted from an inland sea to river floodplains and drier plains.deposited over roughly the past 75 million years At the base of the sequence lies the Pierre Shale, a marine mudstone formed when a shallow inland sea known as the Western Interior Seaway covered what is now the Great Plains.Western Interior Seaway

Above the marine rocks sits a distinctive band of weathered material called the Yellow Mounds, where the old sea-floor sediments altered into colourful soils before being buried by younger deposits.Yellow Mounds Higher still, the White River Group records river and floodplain environments from about 37 to 23 million years ago, including the Chadron, Brule and Sharps formations that together form a kind of natural layer cake along the cliff faces.Chadron, Brule and Sharps formations The rock colours range from pale greys and browns to mustard yellows and soft reds, giving the slopes a banded appearance that is visible from viewpoints and roadside pull-outs.

Erosion carving buttes, pinnacles and canyons

The serrated terrain that gives Badlands National Park its character formed as rivers and streams cut into these relatively soft rocks, carving narrow gullies, steep-sided ravines and freestanding peaks from what had once been a gentler surface.serrated Badlands terrain The Cheyenne and White Rivers played a central role in this process, eroding the sediments into the complex pattern of ridges and canyons now visible across the park.Cheyenne and White Rivers

Because the rock layers are relatively soft, erosion continues to reshape the landscape and exposes fresh surfaces where bands of different formations appear side by side.soft sedimentary rocks Slopes break into small gullies, cliffs retreat, and new miniature spires form on the flanks of larger buttes. In places, narrow ridges run towards the horizon in parallel lines, while nearby hollows open into amphitheatre-like bowls. This mixture of forms means that a short drive or walk can reveal very different views: vertical walls with thin bands of colour, clusters of slender pinnacles, and wider basins edged by stepped terraces.

Prairie, fossils and protected parkland

Badlands National Park is part of the National Park Service system within the United States Department of the Interior and covers well over 240,000 acres in southwestern South Dakota.244,000-acre park Within its boundary, eroded badlands share space with extensive mixed-grass prairie, where native grasses form a relatively open cover that supports wildlife and gives long views across gentle hills.mixed-grass prairie

The park is also known for its fossil-rich deposits from the White River Group, which preserve vertebrate remains from the Oligocene and neighbouring periods, including mammals that lived tens of millions of years ago.Oligocene-age vertebrate fossils These fossils are protected, along with rock, plant and animal resources, and must remain in place under park regulations.protected in the park Badlands National Park was first set aside as Badlands National Monument in 1929 and later redesignated as a national park in 1978, reflecting its geological significance and the value of its fossil record.redesignated as a national park in 1978

Visiting Badlands National Park: what travellers from Western Europe should know

• Badlands National Park lies in southwestern South Dakota, with park headquarters on Ben Reifel Road near Interior and road access from Interstate 90 at Exit 131 and from South Dakota Highways 240 and 377.
• Many viewpoints and short walks lead close to cliff edges, steep slopes and uneven ground, so sturdy footwear is useful where paths cross loose sediment or descend into gullies.
• The park sits within the Northern Great Plains, where summers can be hot and winters cold, and exposed sections offer little natural shade along the badlands ridges.
• 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 southwestern South Dakota in the United States, with entrances and park facilities near the town of Interior.

What should visitors expect on a first visit?

Visitors encounter sharply eroded cliffs, buttes and gullies alongside extensive mixed-grass prairie, with road pull-outs and paths giving access to viewpoints over the layered rock formations.

What makes Badlands National Park distinctive?

The park’s exposed sedimentary layers record about 75 million years of geological history and contain rich fossil deposits, all set within a large protected grassland of the Northern Great Plains.