description Toadstool Geologic Park Overview
Toadstool Geologic Park is a protected badlands area located in the Oglala National Grassland of northwestern Nebraska. The park is notable for its unusual geological formations, particularly large, mushroom-shaped hoodoos created by the differential erosion of ancient river sediments and volcanic ash. These sedimentary layers contain extensive fossil deposits dating back to the Oligocene epoch, roughly 30 million years ago, including the remains of prehistoric mammals. The site is managed by the United States Forest Service and features an interpretive trail for visitors.
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