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Palaeontologists measuring dinosaur footprints
Dinosaur footprints. Palaeontolo- gists measure inverted dinosaur footprints in sandstone, possibly made by a sauropod. These footprints were made in soft mud on the bed of a lake. The prints filled with sand, which was later compressed into sandstone. The block of sandstone was upturned after falling from a cliff. Sauropods were huge, long-necked, browsing herbivores that often lived half immersed in water, which support- ed their body weight. The individual that made these prints was probably about the size of a big African bull elephant. The length of its stride suggests it was ambling along at about 1 kilometre per hour. Photographed in Whitby, Yorkshire, UK.
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