Fallen Boulder at the Grand Canyon Exposes 300-Million-Year-Old Footprints
The oldest fossilized craniate footprints ever discovered in the Grand Canyon were found embedded in a recently fallen boulder located in plain mass . Around 314 million years ago — long before the first dinosaurs appeared on Earth — a reptilian creature assess around a foot long slowly angled its way upward along a windswept sand sand dune . in brief after , the same four - legged animal , or peradventure a like one , take a more direct route , climbing straight up the dune at a slighter faster pace ....