FLAGSTAFF, Ariz. Who first claimed the Navajo Nation? Some had scales, some had horns, and some had beaks.
Dinosaurs roamed the Nation starting over 200 million years ago.
Low water levels in Lake Powell have unveiled a treasure trove of extremely rare fossils belonging to a long-extinct mammal relative that inhabited North America 180 million years ago.
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Researchers documenting fossil tracks in March discovered the first tritylodontid fossils ever found in the Navajo Sandstone and rushed to retrieve them before snowmelt replenished Lake Powell.