Geologic Time Eon Era Period Epoch Hadean Eon

Geologic Time Eon Era Period Epoch

Hadean Eon: 4. 5 to 3. 8 bya - Meteorites. - No Life Archaean Eon: 3. 8 to 2. 5 bya - Stromatolites - Rocks and continental plates beginning to form Proterozoic Eon: 2. 5 bya to 543 mya Oxygen build up, microscopic one-celled Cyanobacteria organisms appear Precambrian Time: 90% of Earth’s History

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)

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

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

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

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

Pleistocene Epoch: ice age, lions, large mammals Holocene Epoch : Human Beings! Quaternary Period: 1. 8 mya to present