John Day Fossil Bed National Monument The Clarno Arch and the Palisades The Clarno Unit Season: Year Round weather permitting Fees: No Fee or Permit Required Features: This is one of the interesting displays of geology and paleontology found in the beautiful John Day Fossil Bed National Monument. The trails that are available for exploring this area are short and easy to hike. If you hike all the options, the mileage is less than two miles. There are placards along the way describing items of interest that add much to your walk through history. Enjoy!! A Virtual Hike in the John Day Fossil Beds NM All for the love of hiking!