When Did The Ichthyosaurus Become Extinct?
When Did The Ichthyosaurus Become Extinct? This last ichthyosaur genus was thought to have become extinct early in the late Cretaceous, during the Cenomanian about 95 million years ago. The ichthyosaurs thus would have disappeared much earlier than other large Mesozoic reptile groups that generally survived until the end of the Cretaceous. Why did the