Proterozoic to Cambrian, 2.5 billion-485 million years ago -- Ordovician to Silurian, 485-419 million years ago -- Devonian, 419-359 million years ago -- Carbonieferous, 359-299 million years ago -- Permian, 299-252 million years ago -- Triassic, 252-201 million years ago -- Jurassic, 201-145 million years ago -- Cretaceous, 145-66 million years ago -- Paleogene, 66-23 million years ago -- Neogene, 23-2.85 million years ago -- Pleistoncene, 2,588,000-11,700 years ago -- Holocene, 11,700 years-today.
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