State officials were called to the scene after a camper spotted human remains protruding from the dirt along the side of the road near a Warm Springs-area campground.
State archaeologist Stan Wilmoth tells The Montana Standard he suspects the remains are those of a Native American man and are less than 2,000 years old. He says part of a bow that was likely buried with the man also was recovered.
Walter Kemp with the state crime lab says officials have not determined the age of the bones discovered about two weeks ago.
Authorities visited the site Monday to determine if they were found on state or federal land. If they were found on state land, they will be handled by the Montana Burial Preservation Board, while the Deer Lodge National Forest archaeologist will receive them if they were on federal land.