“The discovery of this tool below a layer of undisturbed ash that dates to 15,800 years old means that this tool is likely more than 15,800 years old, which would suggest the oldest human occupation west of the Rockies,” U.S. Bureau of Land Management Burns District archaeologist Scott Thomas said in the release. But! Don’t get too excited, because the Associated Press spoke with Donald K. Grayson, a professor of archaeology at the University of Washington, and he didn’t seem completely sold on the find just yet.