Patrol Capt. Jon Nelson says several people were spotted removing the rocks, some dug out of the prehistoric floor of the site. The Forest Service has distributed a photo of three people who it says might be able to help with the investigation.
It's a federal crime to vandalize archaeological resources. Penalties range from a $5,000 fine and six months in jail to a $20,000 fine and a year in jail.
Source: Associated Press [January 21, 2015]