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How many years ago did they exist before the dinosaurs?

April 26, 2017ago dinosaurs exist

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How many years ago did they exist before the dinosaurs?

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The mammal-like reptiles first appear about 80 million years before the first dinosaur does. The are first around in the late Carboniferous, about 300 million years ago, while the first dinosaur appears about the mid Triassic, about 220 million years ago.