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Paleozoic Era-old life
The first time multicellular life forms flourished on earth. -
Period: to
Geologic Time Scale
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Cambrian Period-570-500 MYA
Earliest record of marine life-Trilobites are dominate. -
Ordovician Period 500-435 MYA
Invertebrates are dominant, mollusks became abundant. Showed earliest fish that were jawless and later showed jawed and armored fish. -
Silurian Period 435-395 MYA
Earliest terrestrial plants adn animals. Tikitaalik and Eurypterids develop. -
Devorian 395-345 MYA
Armored fish go extinct, but abundance of several species of fish. earliest amphibians and ammonites. -
Carboniferous Period 345-280 MYA
(Mississippian, Pennsylvanian) Abundant sharks and amphibians. Large swamps and cool forming forests. Earliest reptiles. -
Permian Period 280-225 MYA
Extinction of many types of marine animals including trilobites. -
Mesozoic Era-Middle life
Dinosaurs flourish and go extinct. -
Triassic Period 225-195 MYA
Earliest Dinosaurs, abundant cyads and conifers. -
Jurassic Period 195-136 MYA
Earliest birds and mamals abundant dinosaurs and ammonities. -
Cretaceous Period 136-65 MYA
Earliest flowering plants, climax of dinosaurs folled by extinction. Great decline of brachiopods. Abundance of bony fish. -
Cenozoic Era- New life
The era we live in. -
Tertiary Period 65-1.8 MYA
Earliest placentral mammals, modern mammals, large running mammals. -
Quaternary Period 1.8 MYA-Presant
Large conivores, Neaderthals, humans, mastodons.
