A human hand provides a sense of scale for an allosaurus dinosaur track near Potash, Utah. Scientists believe the dinosaur had an average length of nearly 30 feet. The area was marshy when dinosaurs roamed Utah, and the muddy footprint eventually turned to sandstone. ...There are a number of dinosaur tracks found throughout Utah. The area was swampy when dinosaurs live there. They left footprints in the mud, which later turned into sandstone.
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