Journey to the center of the earth?
Another of the myriad of Anasazi ruin sites along The Comb accessed from Butler Wash Road, although this isn't technically a ruin, it is from the same period. And like most, this is a hike from Butler Wash almost all the way to the west edge The Comb, in fact you may want to tack on a little more time and distance to take in the awesome view to the west over Cedar Mesa.
While Butler Wash Road can be traveled by car when dry that can change very quickly, with rain turning it into a muddy quagmire. Due to this, BLM may close the road whenever conditions warrant it.
See Rob's description for the Hole House Ruin.
Like all the hikes along Butler Wash Road, there are no signs designating specific trail heads. Procession Panel TH is roughly 6.1 miles north of US 163 on a short spur on the west side of Butler Wash Road. Your best bet is locate the TH by the GPS coordinates.
The hike begins from the TH by crossing Butler Wash and following a reasonably easy-to-follow trail up the wash.
With a number of trails leading north & south along the wash it is recommended you have a GPS route to follow the correct path. The farther west you go, the more you have to pay attention to the rock cairns, and once you hit the slick rock, cairns will be the only thing to guide you, unless of course you are following a GPS route. At about .9 mile you will have the choice of ascending up the left slope or continuing along the bottom of the wash. No matter which you choose, for the most scenic variety, be sure to take the other choice on the return trip. (We stayed in the wash and returned by the high route, which made for an easier climb.)
As you approach the west side of The Comb you will want to stick close to the steep wall on your right, otherwise you may miss some of the smaller petroglyphs. Once you reach the actual Procession Panel you'll know you are in the right place. There are various interpretations of just what the petroglyphs were meant to portray, so your guess is as good as mine... whether the procession is going into the earth or coming out of it, who knows?
No reliable sources
Dispersed camping is available all along Butler Wash Road. BLM requires signing in at boxes on either north or south end of Butler Wash Road including information of the number of people and the length of time you expect to stay.
Check out the Official Route and Triplogs.