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Geologic time scale1

Fossils/

TermDefinition
Eon The largest group; divided by the Cambrian boundary(about 550 million years ago) when the variety of life forms explodes; billions of years long
Era Mass extinctions mark the boundaries between the eras; hundreds of millions of years long
Period Blocks of time when a unique rock series was laid down; tens of millions of years ago
Epoch Divisions of the most recent periods; several million years long
Era: Cenozoic Period: Quaternary Epoch: Holocene 11000 years ago to present day and human are present
Era: Cenozoic Period: Quaternary Epoch: Pleistocene 1.8 millions years ago to 11,000 years ago
Era: Cenozoic Period: Tertiary Epoch: Pliocene 5 million to 1.8 million years ago
Era: Cenozoic Period: Tertiary Epoch: Miocene 23 million to 5 million years ago
Era: Cenozoic Period: Tertiary Epoch: Oligocene 38 million to 23 million years ago
Era: Cenozoic Period: Tertiary Epoch: Eocene 54 million to 38 million years ago
Era: Cenozoic Period: Tertiary Epoch: Paleocene 65 million to 54 million years ago The rise of mammals
Era: Mesozoic Period: Cretaceous Epoch: N/A 145 million to 54 million years ago The Flowering of plants
Era: Mesozoic Period:Jurassic Epoch: N/A 146 million to 208 million years ago Birds
Era: Mesozoic Period: Triassic Epoch: N/A 208 million to 245 million years ago First dinosaurs/ mammals
Era: Paleozoic Period: Permian Epoch: N/A 245 million to 286 million years ago
Era: Paleozoic Period: Carboniferous Epoch: N/a 286 million to 360 million years ago First Reptiles
Era: Paleozoic Period: Devonian Epoch: N/A 360 million to 410 million years ago First amphibians
Era: Paleozoic Period: Silurian Epoch: N/A 410 million to 440 million years ago First Insects
Era: Paleozoic Period: Ordovician Epoch: N/A 440 million to 505 million years ago First Fish
Era: Paleozoic Period: Cambrian Epoch: N/A 505 million to 544 million years ago Explosion of life forms
Era: Proterozoic 544 million to 2500 million years ago Multicelled organisms
Era: Archaean 2500 million to 380 million years ago Single-celled organisms
Era: Hadean 3800 million to 4500 million years ago
Created by: BricesGirl<3(:
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