. Dinosaur footprint. Woman crouching by the fossilised footprint of a sauropod dinosaur. Such footprints were generally formed in marine coastal environments, when a print left in sand or mud was baked dry by the sun and filled with other material. When this material later eroded away, the print was revealed. This footprint may have been made by an Apatosaurus, a huge, long-necked herbivore that lived during the Jurassic period, approximately 150-140 million years ago. Apatosaurus reached a length of 20 metres and weighed around 30 tonnes. Photographed in Portugal. MODEL RELEASED

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