Submitted by Waspie Dwarf: Ancient footprints have provided compelling evidence that some dinosaurs were able to swim, scientists report. The 15m (50ft) trackway that reveals one animal's underwater odyssey was discovered in the Cameros Basin in Spain, once a vast lake. The S-shaped prints suggest the beast clawed at sediment on the lake floor as it swam in about 3m (10ft) of water. The marks are about 125 million years old, dating to the Early Cretaceous, the team writes in the journal Geology. They were left by a large, bipedal, carnivorous dinosaur. "We came across them about three or four years ago," explained Dr Loic Costeur, a palaeontologist at the University of Nantes, France, and a co-author of the paper. "The Cameros Basin has thousands of walking footprints from diverse dinosaur fauna, but when we saw these it was obvious straightaway that this was a swimming dinosaur." The underwater trackway, which is well-preserved in sandstone, is made up of 12 consecutive prints each consisting of two to three scratch marks. "The footprints are really peculiar in their shape and morphology - they are not at all like walking footprints," Dr Costeur told the BBC News website. "In walking footprints, you can recognise the shape of the foot; but here it is not at all the case: it is sets of grooves on the sediment surface. "You get the idea that the animals' body was supported by water as it was scratching the sediment." Ripple marks around the track suggested the dinosaur was swimming against a current, attempting to keep a straight path, the team said. Further investigation of the well-preserved track revealed more about the beast's swimming style.
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