Paleontologists have examined a large assemblage of dinosaur tracks and fossilized plants from the Nanushuk Formation, which crops out over much of the central and western North Slope of Alaska, varying from 1,500 to 250 m (4,921 to 820 feet) thick from west to northeast. A theropod dinosaur footprint in the Nanushuk Formation, Alaska, the United States. Note the sinusoidal curve of the middle toe impression. Scale bar – 10 cm. Image credit:...
