Grand Canyon NPS:
Grand Canyon National Park, Bright Angel Trail_0300
Grand Canyon NPS:
Grand Canyon National Park, Bright Angel Shale_0314
Grand Canyon NPS:
Grand Canyon Bright Angel Layering_3551
Grand Canyon NPS:
Grand Canyon Bright Angel Layering_3541
Grand Canyon NPS:
Grand Canyon_Fossil Worm Tracks_3823
Grand Canyon NPS:
Grand Canyon National Park Fossil GRCA 2117: FOSSIL TRAIL OF TRILOBITE