This is cool. Reptile tracks that are 290 million years old. It will necessitate a rewrite:

"We know from the trackways that these animals had their feet planted almost under their body," Berman said, "whereas in textbooks, they give them a sprawling gait as if the limbs are extended out from the body considerably. This just isn't true. You look at the trackway and you see that the footprints are very close to the midline of the body."

Science in action.