4.6 BYA- 544 MYA - Pre-Cambrian Era, 3.5 BYA - First life on earth appears, 2 BYA - 1st eukaryotic cells appear, 245 MYA- 65 MYA - Mesozoic Era, 430 MYA - Land plants appear, 200,000 YA - First human appears, 65 MYA-Present - Cenozoic Era, 544 MYA-245 MYA - Paleozoic Era, 65 MYA - Cretaceous Extinction of Dinosaurs,

Geologic Time Scale and Dates of Major Events

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