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Geologic Time Eon Era Period Epoch ______________________________________________

Geologic Time Eon Era Period Epoch ______________________________________________ Precambrian Time 4.6 billion to 543 mya ______________________________________________. Hadean Eon: 4.5 to 3.8 bya. - Meteorites. - No Life.

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Geologic Time Eon Era Period Epoch ______________________________________________

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  1. Geologic Time Eon Era Period Epoch ______________________________________________ Precambrian Time 4.6 billion to 543 mya ______________________________________________

  2. Hadean Eon: 4.5 to 3.8 bya - Meteorites. - No Life Archaean Eon: 3.8 to 2.5 bya - Rocks and continental plates beginning to form - Stromatolites Proterozoic Eon: 2.5 bya to 543 mya Oxygen build up, microscopic one-celled organisms appear Precambrian Time: 90% of Earth’s History Cyanobacteria

  3. Paleozoic Era: 543 to 248 mya All Life in the ocean First vertebrates, reptiles, ferns, insects. Mesozoic Era: 248 to 65 mya – Small mammals, birds, flowering plants, dinosaurs Mass extinction! Cenozoic Era: 65 mya to present – all modern animals, human beings Phanerozoic Eon : (543 mya to present)

  4. Cambrian Period: sponges, worms, algae Ordovician Period: land plants, mass extinction! Silurian Period: hard-shelled organisms, trilobites Devonian Period: fish, trees, insects Mississippian Period: vertebrates, forests Pennsylvanian Period: reptiles, swamps, ferns Permian Period: turtles, large reptiles, snakes Paleozoic Era: 543 to 248 mya

  5. Triassic Period : Age of the reptiles, coral, starfish, squid, dinosaurs, frogs Jurassic Period: Rodents, dinosaurs, sharks, insects Cretaceous Period: Dinosaurs, plankton, micro-organisms MASS EXTINCTION!!! Mesozoic Era: 248 – 65 mya

  6. Tertiary Period: Age of birds and mammals Quaternary Period: “Age of Man” Cenozoic Era: 65 mya to present time

  7. Paleocene Epoch: Small mammals, marsupials, birds Eocene Epoch: camels, pigs, horses Oligocene Epoch: rhinos, apes Miocene Epoch: deer, giraffe, elephants Pliocene Epoch: modern animals Tertiary Period: 65 – 1.8 mya

  8. Pleistocene Epoch: ice age, lions, large mammals Holocene Epoch : Human Beings! Quaternary Period: 1.8mya to present

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