Newly Discovered Fossil Footprints from Grand Canyon National Park Force Paleontologists to Rethink Early Inhabitants of Ancient Deserts
30-NMMNHS-Artwork depicting the Coconino desert environment and two primitive tetrapods,
30-NMMNHS-The track-bearing boulder (Coconino Sandstone), Grand Canyon National Park, Arizona.
30-NMMNHS-Close-up view of the Ichniotherium trackway from Grand Canyon National Park.
30-NMMNHS- Grand Canyon Anniversary logo NPS
