Hadrosaur track with leaves highlighted

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Hadrosaurs, also called duck-billed dinosaurs, roamed Denali National Park in large herds ~70 million years ago during the Cretaceous Period. This track was made when a herbivorous hadrosaur walked through the mud near a river bank and stepped on fallen leaves. Through time the track and leaves were compacted, cemented, and preserved as fossils in the Cantwell Formation. Not all plant fossils that can be seen on this track have been highlighted or annotated. This 3-D fossil image is available courtesy of Denali National Park and Preserve.