This pictograph, above is interestingly called a Sun Dagger site. These circles are all perfectly bisected in half by the shadow of the sun on the rock overhang at a certain time of day. Apparently, this one bisects at about 10 AM Mountain Daylight Time.
These two panels were probably created by hunter-gatherers. They were located in what is called the East Four Mile Recreation area along Highway 139 south of Rangely, Colorado.
There are multiple styles shown on this panel. There are depictions of corn, a snake, and anthropomorphs. My guide book says Freemont style, but also Barrier Canyon Style.