Researchers have reported on what they're calling the 'Coliseum' site of dinosaur tracks, a large and multi-layered rock formation in Denali National Park in Alaska that carries markings dating back some 70 million years.
, covering many different dinosaur types and species. That's testament to how busy this site, most likely a watering hole on a large flood plain, would have been over the years.
Measuring some 7,500 square meters in terms of total area – so a little bigger than a standard soccer pitch – the rocky outcrop stands about as tall as a 20-story building, with tracks spread all across its variousA wider view of the Coliseum. Dinosaur tracks are visible as dimples on the flatirons – the triangular formations of the once horizontal rocks. paleontologist Dustin Stewart, who led the study while at the University of Alaska Fairbanks.
"It is a sequence through time. Up until now, Denali had other track sites that are known, but nothing of this magnitude." While initial observations only revealed a trackway at the bottom of the Coliseum cliff, experts soon spotted other markings. The tracks are a combination of that was then hardened and covered over, and track impressions preserved because they were subsequently filled in by sediment.paleontologist Pat Druckenmiller from the University of Alaska Fairbanks."You can see the shape of the toes and the texture of the skin.
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