As a kid, this brought to mind one endless summer when dinosaurs flourished. The Mesozoic Era, which lasted from about 250 million to 66 million years ago, is often called the Age of Dinosaurs. We need to know when a dinosaur lived to comprehend how it fits into what paleontologist William Diller Matthew called “life’s splendid drama.” But we throw around Deep Time estimates, framed in millions of years, so often that it’s easy to become inured to the wider context of life’s history. You can’t understand dinosaurs without a sense of time. About 83 million years separated Late Jurassic icons-such as this Torvosaurus-from Cretaceous celebrities like Tyrannosaurus.
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