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-Map of Arizona

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

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