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Prehistoric Footprints Discovered By Grand Canyon Hikers

When you’re out hiking, you never know what you might see. You could cross paths with lizards, tarantulas or maybe even something bigger like a javelina. More likely, you’ll also come across the tracks of these critters.

But imagine you’re hiking in the Grand Canyon and you stumble upon a slab of fallen rock. On it are some odd indentations like overly-baked footprints. That’s exactly what happened to a group of hikers on the Bright Angel Trail.

A set of 28 small footprints were discovered on a slab of rock that had fallen from the canyon wall. It turns out that the set of tracks is about 310 million years old. Dr. Steve Rowland, a professor of geology at the University of Nevada, Las Vegas, said the find is remarkable.

"There are some trilobite tracks and other little arthropods and things older. But in terms of actual vertebrate animals these are the oldest by far. Nobody's ever found any tracks this low, this old in in the Grand Canyon," said Rowland.

Until now, no reptile tracks have ever been found in this type of rock before in the Grand Canyon. Rowland said paleontologists like himself have never bothered to look in that area for ancient animal tracks since none have ever been found. But this discovery is a game changer.

"Now that we know there were animals walking around ... at that time period we can ... look at some other places and see if we can find any any additional tracks."

But what animal made those tracks is still a mystery. Rowland said it’s definitely some kind of prehistoric reptilian creature, which was living at the very beginning of reptile evolution. 

"It looks like a reptile track. Amphibian tracks tend to have short stubby little toes like salamander toes for example or toad toes. These these are long skinny toes that look much more reptilian," said Rowland. "So I think this is some sort of reptile but it's extraordinarily early just the reptiles were just appearing at the time that this animal was walking around."

He said it might have looked like some sort of small reptile but we won’t really know without finding the animal’s bones. Rowland’s team will publish their research in January.

EDITOR'S NOTE: A previous version of this story stated that the tracks pre-date the age of the dinosaurs by nearly 250 million years. In fact, they are about 310 million years old, whereas dinosaurs first appeared around 240 million years ago.

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Kaely Monahan joined KJZZ Original Productions as a producer in December 2016.Monahan is a native, and growing up in the East Valley gave her an intimate familiarity with the Valley of the Sun. Eager to experience a new city, she left Phoenix for Tucson to earn her degree in classical studies from the University of Arizona with an emphasis in mythology. Several years later, her focus transitioned from history to history-in-the-making and news. Monahan went on to earn her master’s degree in international journalism from City University of London.In London, Monahan worked with CBS News and The Times covering international news. On her return to Arizona, Monahan was the art and entertainment editor for the East Valley Tribune, before moving into broadcasting, where she worked in commercial radio as an anchor and reporter.Outside of work, Monahan spends her time reading historical novels, exploring new restaurants in the Valley, and watching movies. Her love of film led her to create a movie review podcast and website. Monahan is also the vice president of the Phoenix Critics Circle.