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This month, he and Kobayashi, a paleontology professor at Japan’s Hokkaido University Museum and an expert on dinosaurs in Mongolia, China and Japan, stood over a kitchen-appliance-sized hunk of sandstone, marveling at knobbly, rounded shapes protruding from the boulder’s surface. The chunkier pieces sticking out from the rock were dinosaur toes, obvious signals that more than one hadrosaur set its foot right into this muck before it hardened 70 million years ago.