From Associated Press:
Site of dinosaur tracks to be unveiled
by Brady Mccombs
SALT LAKE CITY, UTAH – A dry wash full of 112-million-year-old dinosaur tracks that include an ankylosaurus, dromaeosaurus and a menacing ancestor of the Tyrannosaurus rex, is set to open to the public this fall in Utah.
There are more than 200 tracks near the city of Moab from 10 different ancient animals that lived during the early Cretaceous period, said Utah Bureau of Land Management paleontologist ReBecca Hunt-Foster.
They were first discovered in 2009 by a resident. Since then, paleontologists led by a team at the University of Colorado at Denver have studied them and prepared them to go on display for the general public.
The tracks include a set of 17 consecutive footprints left by [a] Tyrannosaurus rex ancestor and the imprint of an ancient crocodile pushing off into the water.
The site is one of the largest areas of dinosaur tracks from the early Cretaceous period known to exist in North America, she said.
“We don’t usually get this,” said Hunt-Foster, a paleontologist for 16 years. “It is a beautiful track site, one of the best ones I’ve ever seen.”
In one rock formation, a footprint left behind by a large plant eater is right in the middle of prints from a meat-eating theropod, Hunt-Foster said.
The imprint of an ancient crocodile shows the chest, body, tail and one foot. Paleontologists believe it was made while the crocodile was pushing off a muddy bank into water.
Paleontologists believe the tracks were made over several days in what was a shallow lake. They likely became covered by sediment that filled them up quickly enough to preserve them but gently enough not to scour them out, Hunt-Foster said. Over time, as more sediment built up, they became rock. They’re near a fault line, where the land has moved up and down over the years, she said. Rain slowly eroded away layers of the rock, exposing the footprints.