Overview
Ancient mammal bones from Agate Fossil Beds can be found in museums around the world. Excavations began at Carnegie Hill in 1904 and soon thereafter at University Hill to be shipped back to Lincoln, Nebraska. You would never guess at the thousands of fossils removed from these nondescript hills while hiking the 2.7 miles across the prairie from the National Park Service (NPS) visitor center.
Highlights
Museum, film, Daemonelix Trail
Must-Do Activity
The NPS visitor center has an excellent display of the 20-million-year-old inhabitants of this spot, as well as a great collection of American Indian artifacts. You can also learn about the mystery of the daemonelix, a corkscrew burrow which baffled researchers until it was eventually discovered to have been formed by palaeocastor, an ancestral land beaver.
Best Trail
The Daemonelix Trail on the west side of the National Monument allows you to get an up close view of one of the palaeocastor’s corkscrew burrows. A cast of this exact same formation is on display at the Smithsonian Museum of Natural History in Washington D.C.
Instagram-worthy Photo
Northwest of the National Monument in Oglala National Grassland, Toadstool Geologic Park is a beautiful badlands that is best photographed at sunset. While exploring its trails, look for fossilized bones and trackways, plus be sure to visit the Hudson-Meng Education and Research Center, which is open in the summer.
Peak Season
Summer
Hours
https://www.nps.gov/agfo/planyourvisit/hours.htm
Fees
None
Road Conditions
The entrance road from Highway 29 in the west and through the park is paved, but turns to well-graded gravel east of the National Monument.
Camping
No camping within the National Monument, but there is a free primitive campground at Toadstool Geologic Park in Oglala National Grassland. Fort Robinson State Park offers camping, cabin rentals, and accommodations in former military barracks.
Scott at one of the main dig sites. 
Fossilized roots 
Tiff next to a daemonalix. 
Tiff during a Toadstool Geologic Park sunset. 
On the Daemonalix Trail 
Inside the NPS visitor center 
Part of the James H. Cook collection. 
Not every NPS site has a cool trailer like this. 
Countless fossils have been removed from these nondescript bluffs.
Explore More – How did the frontiersman James H. Cook collect the impressive array of American Indian artifacts now on display in the NPS visitor center?
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