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What could be the oldest footprints ever, of a lizard like-creature that roamed Earth 310 million years ago have been discovered in the Grand Canyon. Made by one of the first reptiles that ever lived the prints make it look as if the creature was line dancing.

Ê×Ò³| Â鶹´«Ã½Ó³»­ 310 million years ago in what's now Arizona, a primitive creature trundled along on all fours through towering sand dunes that spilled into the sea. Normally, this creature's tracks would have vanished like other footfalls on a beach. But in a rare case, the tracks hardened into sandstone—preserving this flash of ancient behavior.

Some 310 million years ago, a reptile-like creature with an unusual gait roamed the sandy expanses of the Grand Canyon, leaving a trail of 28 footprints that can still be seen today. As Michael Greshko reports for National Geographic, these unusually well-preserved markers represent the national park’s oldest footfalls—and, if additional analysis links the early reptile to one that left a similar set of prints in Scotland roughly 299 million years ago, the tracks may even earn the distinction of being the oldest of their kind by more than 10 million years.

Ê×Ò³| Â鶹´«Ã½Ó³»­ 310 million years ago in what's now Arizona, a primitive creature trundled along on all fours through towering sand dunes that spilled into the sea. Normally, this creature's tracks would have vanished like other footfalls on a beach. But in a rare case, the tracks hardened into sandstone—preserving this flash of ancient behavior.

In a lab at the Las Vegas Natural History Museum, researchers from UNLV are combing over fossils from a Columbian mammoth that was a real stand-up guy.

More than 80 percent of land in Nevada is publicly owned. This wealth of open space is a treasure trove for paleontologists. Their digs into the dirt can teach us about what our world was and hint at issues we might have to confront tomorrow.