U U-3 loop 49 Uncompahgre highland 54, 113 Upheaval Canyon 46 Upheaval Dome 43 Uranium 16, 34, 97 mines 16, 29, 50, 100 occurrence 16, 62 Ute petroglyphs 12 V Vegetation, Chesler Park 76 fossil forest 101 Hatch Point 47 historical changes 5, 90 Island in the Sky 29 Squaw Flat 63 W Wasatch Formation 116 Water, artesian 91 floods 67 ground 64, 65 Island in the Sky district 43, 91 potholes 36, 65 quicksand 66 springs 36 Whale Rock 46 White Rim 34, 58 White Rim Sandstone 23, 47, 54 color 24 elaterite 58 potholes 36 thickness variation 23, 34, 40, 43 water 91 White Rim Trail 34 Windwhistle Campground 47 Wingate Sandstone 46, 54, 61, 115 cliff dwellings 97 petroglyphs 12, 97 resistance to erosion 25 Wooden Shoe 66 Wupatki National Monument 115