SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Dinosaur footprint in sandstone rock. This is the print of the foot of an iguanodontid dinosaur. These were herbivorous dinosaurs that flourished in the Cretaceous period, between 146 and 65 million years ago. These rocks date from the earlier part of that period. Photographed at Olhos de Agua, Portugal.
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