Toadstool Geologic Park

The rock at Toadstool was laid down tens of millions of years ago as layers of clay, silt, sand, and volcanic ash settled across an ancient floodplain. Over the long ages since, wind and water have stripped away the soft ground, cutting the deep gullies, ridges, and spires that make up a badlands, a landscape too broken and bare to farm or easily cross.

The signature toadstool shapes form where a layer of harder sandstone caps a column of softer clay beneath. The hard cap shields the clay directly under it from the rain, while the surrounding clay washes away, until a broad stone slab is left balanced on a narrow pedestal like a mushroom. In time the pedestals thin and the caps topple, so the shapes are always slowly changing, being remade by the same erosion that carved them.

The badlands around Toadstool sit within one of the richest fossil regions in North America, the same beds that yield the ancient mammal skeletons displayed in museums across the plains. Long ago this was a warm, wet plain roamed by creatures unlike anything alive today, early rhinoceroses, three-toed horses, and piglike animals among them.

What makes Toadstool special is not just bones but tracks. Preserved in the rock are trackways, lines of footprints where animals walked across soft mud that later hardened and turned to stone. Walking beside those ancient steps, you are following the exact path an animal took across a landscape that has since utterly vanished, a rare and moving connection to deep time.

Toadstool lies within the Oglala National Grassland, a vast sweep of public shortgrass prairie named for the Oglala Lakota, whose homeland this high plains country was and remains. The Lakota hunted the bison that grazed these grasslands, and the badlands and buttes were part of a landscape they knew and traveled for generations.

Today the grassland is quiet ranch and public land, grazed by cattle and pronghorn, home to prairie dogs, hawks, and the occasional bighorn sheep in the nearby breaks. A trail links Toadstool to the Hudson-Meng bone bed a few miles away, where hundreds of ancient bison lie buried, tying the badlands to the long human and animal story of the plains.

Spring and fall are the kindest seasons, with mild temperatures and softer light for walking the trails and photographing the formations. Spring can bring sudden rain that turns the clay to sticky gumbo, so watch the weather.

Summer is hot, bright, and shadeless, best explored in the cool of early morning or evening with plenty of water. Winter is cold, still, and often snow-dusted, the badlands stark and beautiful, though the roads can be treacherous and services are far away. On any clear night the sky here is superbly dark.

The closest Boutel™ stays, so you can turn this stop into an overnight. Each is an independently owned, editorially selected place to stay.