Ichthyosaurs seem to have used a quiet part of the ocean as a nursery to bring up their young more than 200 million years ago
These ichthyosaurs belong to a species called. They were between about 11 and 15 metres long and lived some 215 million years ago, near the end of the Triassic.
Camp suggested in his description that there had been a mass stranding event, as sometimes happens to whales and dolphins today. “He imagined that they were hunting around in the shallows and the tide had gone out, and they had got inadvertently left behind,” saysThis explained the absence of smaller animals like fish among the fossils, because they could have escaped even in shallow water.
Kelley and his colleagues have now re-examined the evidence. They looked for signs of environmental disruptions like volcanic eruptions or low oxygen levels, which might have killed the ichthyosaurs. “We could not find direct evidence of any of that,” he says.at the University of Edinburgh, UK, has spent years sorting the fossils, which were left in some disarray.
There are signs that other marine reptiles used breeding grounds. In 2006, Kear and his colleagues described . The remains include lots of small, young animals, all living in “a huge embayment” that would have served as “a sheltered calving ground”.
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