Pre-Cambrian Era: 4.6 billion - 544 million years ago, At the end, the first multicellular organisms first appeared., First evidence of life on Earth, Paleozoic Era: 544 million - 245 million years ago, By the end of the era, 90% of marine life was extinct., Life moved onto land, Mesozoic Era: 245 million-65 million years ago, Ended with the Cretaceous extinction, The "age of the dinosaurs", Cenozoic Era: 65 million years ago to the present, The "age of the mammals",

The Geologic Time Scale: Important Changes and Events

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