In a remote corner of southern Arkansas, scientists have found a rocky field full of dinosaur footprints -- lots of them, in an area about as large as two football fields.
The fossilized tracks probably date to the Early Cretaceous period, 115 to 120 million years ago. Researchers say the dinosaurs who left them probably included giant predators, such as Acrocanthosaurus atokensis, an early cousin of T. rex. There are also large, long-necked plant-eating dinosaurs such as Pleurocoelus and Paluxysaurus, who may have been easy prey.
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