The Toadstool Geologic Park is located north of Crawford in the Oglala National Grassland. The Park is named for its unique rock formations—giant, narrow clay pedestals topped with slabs of sandstone that resemble toadstool mushrooms. Many of the rocks preserve fossils and footprints of extinct species like tortoises, rhinos, saber-toothed cats, early three-toed horses, camels, and lizards. Hikers frequently comment the colorful, odd-shaped formations have a “moonscape” appearance.

A one mile loop trail guides visitors along many of the incredible formations and interpretive brochures detailing the fascinating geology and paleontology are available at the trailhead. Nearby, a reconstructed sod house offers visitors a glimpse into the life of an early homesteader on the prairie. The Bison Trail runs 3 miles to the Hudson-Meng Research and Education Center where guests can see a 10,000 year old bison bonebed being excavated. There is a small campground and picnic area in Toadstool Geologic Park, but no water.