G Garden of Eden 50, 69, 70 Gas exploration, deep tests 15, 99 Geographic setting _18_ Geologic age of rocks in park _98_ Geologic events forming the Colorado Plateau _98_ Geologic history, summary _98_ Geologic Time Spiral 101, 103 Geology, at the park entrance 57 Glen Canyon Group 52, 102, 103 Glen Canyon National Recreation Area 101, 103 Goblin Valley State Park 66, 103 Gould, Lawrence M. 1 Goulding, Harry, first person to drive into The Windows section 2, 69 Grabens 34 Grand Canyon National Park and National Monument 102 Gravity anomalies, Salt Valley 32 Green River 103 Ground water 41 “Guide to an Auto Tour of Arches National Park,” (The) 5, 50, 51, 72 Gulf of California 33 H Hastier, (Mrs.) Hazel Wolfe 13 Headquarters area _57_ Henry Mountains 101 Herdina Park 25, 69 number of arches 41 Hermosa Formation, Paradox Member 23, 25, 29, 30, 32 History, early _9_ geologic, summary _98_ “Hoodoos and goblins” 66, 103 Hoover, Herbert, proclamation 1 Horizontal arches 44 Horseshoe Canyon, pictographs 10 Horseshoe Canyon Detached Unit of Canyonlands 23 Humid regions, subdued rounded landforms 37 I Igneous rocks 22, 99 “Indian-Head Arch” 98 Iron in the rocks 23 Island in the Sky 102