Found these on a hike a bit north of Vernal, Utah last week. From what I understand, they are ca. 1000 years old and date from a time when there was violence between different tribes of the ancestral puebloans.
Thanks, Jim. There were only a few obvious examples of vandalism, each of which ticked me off, such as the one attached below. Not sure when this panel was defaced but it looks to be a while back.Neat find, Eric. These look very distinct...surprisingly so. I would have guessed they might be modern graffiti.