Placer County authorities are trying to identify human remains discovered after a hiker came across a skull in a remote, wooded area near Truckee, California.

Sheriff’s deputies and a search and rescue team found several additional bone fragments after a hiker discovered the skull near Highway 89 on Sunday.

In addition to the remains, they found a weathered, old campsite where they’re searching for additional clues.

The coroner’s office says the remains appear to have been exposed to the environment for a lengthy period of time.

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