The Clarno Unit is located 18 miles west of the town of Fossil, Oregon. The Palisades are the most prominent landform and are volcanic lahars, or mudflows, that formed 54-40 million years ago in a lush semi-tropical rainforest environment. Tiny four-toed horses, huge rhino-like brontotheres, crocodilians, and meat-eating creodonts that once roamed ancient jungles are now found in the rocks of the Clarno Unit, as well as an incredibly diverse range of plant life. Leaves, fruits, nuts, seeds, and petrified wood from 173 species of trees, vines, shrubs, and other plants have been found here thus far.
Glimpses of fossilized plants can be seen along the cliff walls.
Hiking Trails in the Clarno Unit
The Palisades Trailhead is located ¼ mile west of the picnic area along Highway 218. The Trail of Fossils and the Clarno Arch Trail start at the trailhead. There is limited parking at this area. The Geologic Time Trail connects the trailhead with the picnic area, where additional parking is available. Please remember to recreate responsibly and Don't Hurt the Dirt!
Clarno Fossil Layers
Other Places to Visit in the Monument
Painted Hills Unit
The colorful stripes and gentle ripples of the Painted Hills makes it one of the most popular destinations in the park.
Sheep Rock Unit
Home to the Thomas Condon Paleontology Center and the Cant Ranch Museum, the Sheep Rock Unit also has many trails and scenic views.
Last updated: June 17, 2022