Triassic Period, 250-200 million years BP. A complete and finely-preserved fossil Keichousaurus hui marine 'dinosaur', on a rectangular veined matrix slab. 1.3 kg, 30.5cm (12"). From a Lincoln palaeontological collection; acquired 1970s-1980s; from Xingyi, Guizhou, China. Keichousaurus was a late-Triassic marine reptile, and a member of the Pleurosaur family, that died out around 250 million years ago, during the Triassic-Jurassic extinction event. They were specialised fish eaters and were highly unusual amongst marine reptiles in that they gave birth to live young rather than laying eggs.