Plant-eating dinosaurs probably arrived in the Northern Hemisphere millions of years after their meat-eating cousins, a delay likely caused by climate change, a new study found. A new way of calculating the dates of dinosaur fossils found in Greenland shows that the plant eaters, called sauropodomorphs, were about 215 million years old, according to a study in Monday’s Proceedings of the National Academy of Sciences. The fossils previously were thought to be as old as 228 million years. That changes how scientists think about dinosaur migration. The earliest dinosaurs all seemed to first develop in what’s now South America about 230 million years ago or longer. They then wandered north and
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