Formation of the Earth – Hadean Eon (Precambrian), Formation of the Moon – Hadean Eon (Precambrian), Formation of oceans and early crust – Hadean Eon (Precambrian), First simple life forms appear – Archean Eon (Precambrian), Photosynthesis begins – Archean Eon (Precambrian), Oxygen increases in the atmosphere – Proterozoic Eon (Precambrian), First multicellular organisms appear – Proterozoic Eon (Precambrian), Cambrian explosion (rapid diversification of life) – Cambrian Period (Paleozoic Era), First fish appear – Ordovician Period (Paleozoic Era), First land plants appear – Silurian Period (Paleozoic Era), First insects appear – Silurian Period (Paleozoic Era), First amphibians appear – Devonian Period (Paleozoic Era), First reptiles appear – Carboniferous Period (Paleozoic Era), Largest mass extinction occurs – Permian Period (Paleozoic Era), First dinosaurs appear – Triassic Period (Mesozoic Era), First mammals appear – Triassic Period (Mesozoic Era), Dinosaurs dominate the Earth – Jurassic Period (Mesozoic Era), First birds appear – Jurassic Period (Mesozoic Era), First flowering plants appear – Cretaceous Period (Mesozoic Era), Extinction of dinosaurs – End of Cretaceous Period (Mesozoic Era), Mammals become dominant – Paleogene Period (Cenozoic Era), Early human ancestors appear – Neogene Period (Cenozoic Era), Ice ages occur – Quaternary Period (Cenozoic Era), Appearance of modern humans – Quaternary Period (Cenozoic Era).

Geologic Time Scale

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