Visited the three mile site at Gunlock today. This site is 3 miles into the park from the South end. You will come to a cliff wall with a pull out - park there and walk around the cliff to the trail. Once at the top look for foot prints going right and you will find the rock art and probably about a dozen pit houses. The art is scattered all along the rim but there is one news paper rock that is full of art.
Art and Pit houses: 37°13'5.88"N 113°46'33.60"W
Newspaper Rock: 37°13'5.76"N 113°46'35.58"W
Good hunting!