Thompson Wash

On Google Maps, this site is listed as Sego Canyon Petroglyphs. However, this rock art is in Thompson Wash before the road splits to go up Thompson and Sego Canyons. There is a parking lot and toilets. There are some panels across the road, some of which are on private property. Those on private property can be seen from the road.

Castleton writes that the area has "some of the finest rock art sites in Utah[.]" Castleton v.1, p.168.

Coordinates for Potash Road and US-191:

UTM: 621710, 4274000
Decimal degrees: 38.60616, -109.60218
Lat/Long: 38° 36' 22.18", 109° 36' 07.86"

Maps:

1:100,000 Moab
1:24,000 Moab

Castleton, v.1 p.169

These two are close-ups of the previous one. I've seen the cross with dots somewhere else (In Nine Mile Canyon, I think). It does loosely resemble one on the Bloomington Boulder. The sheep on the right of the last photo has "hooved" feet that we've seen in Nine Mile Canyon and on Potash Road near Moab.

This one and the next three are close-ups of the previous photo.

Near the bottom you can see petroglyphs done over the pictographs and vice versa.

The previous four photos were taken of the panels in a corral on private property. They were taken with a telephoto lens from the road. Castleton, v.1 p.171. This panel was shown in the same episode of the Ancient Aliens as the panel above.