Finally figured out where this place is after getting a run a round from a lot of people. The cave is at GPS Coordinates 37°16'49.32"N 113°50'42.86"W. There area number of ways in there depending upon where you are coming from and what you drive. Look at Google Earth and you will see the routes.
Now about the cave. It is supposed to be filled with petroglyphs and I don't doubt that BUT we did not get up in there as I weighed the choice of seeing the petroglyphs or dying and living won out. A fat old man should not try to skirt the 1" wide 45 degree ledge for about 25 feet to get in there. If I want to see them I will get a 16 foot aluminum ladder and climb up in front as I don't have any climbing safety equipment. I am told you can get in there without ropes, yeah right and the check is in the mail. Again I am too old and fat to try BUT the choice is yours. Good climbing.