Drew's Geologic Timeline

By drewamburgy

  • Cambrian 570-500 MYA

    Earliest record of marine life. trilobites dominate. Fossils are extremely rare, primitive aquatic plants.

  • Ordovician 488-443 MYA

  • Silurian 435-395 MYA

    Earliest terrestrial plants and animals. Peak development of euryplerids.

  • Devonian 395-345 MYA

    Earliest amphibians and ammonites. Extinction of armored fishes, abundant fishes.

  • Carboniferous 345-280 MYA

    Earliest reptiles. Great coal-forming forests. Abundant sharks and amphibians. Large and numerous scale trees and seed ferns.

  • Permian

    Exteinction of many kinds of marine animals, including trilobites. Little change in terrestrial animals.

  • Triassic 225-195 MYA

    Earliest dinosaurs. Abundant cycades and conifers.

  • Jurassic 195-136 MYA

    Earliest birds and mammals. Abundant dinosaurs and ammonites.

  • Cretaceous 136-65 MYA

    Earliest flowering plants. Climax of dinosaurs and ammonites-followed by extinction. Great decline of brachiopads. Great development of bony fishes.

  • Tertiary 65-1.8 MYA

    Humans, mastodons, mammoths and Large carnivores. Abundant grazing animals. Large running mammals, Many modern types of mammals, earliest placentel mammals.

  • Quarternary 1.8- present