Eras of Earth Flashcards
Hadean
formation of earth; little surviving rock evidence
archean
earth cooling, formations of oceans, beginning of life, and toward the end, oxygen event
proterozoic
formation of eukaryotes and more complex multicellular life. at the very end, during the edicarian, early complex animals formed
cambrian
period of paleozoic; evolution of bilateral complex animals
ordovician
period of paleozoic; marine plants and colonization of land
silurian
period of paleozoic; early vascular plants
devonian
period of paleozoic; widespread fish, insects, and early tetrapods
carboniferous
period of paleozoic; forests of vascular trees, early seeded plants, and reptiles
permian
period of paleozoic; radiation of reptiles, modern insect groups, and a mass extincition rebalancing toward land animals
triassic
period of mesozoic; emergence of cone-seeding plants (gymnosperms), development of dinosaurs, early mammals
jurassic
period of mesozoic; gymnosperms dominant, diverse dinosaurs
cretaceous
period of mesozoic; flowering plants (angiosperms), mass extinction
paleocene
period of cenozoic; radiaiton of mammals, birds and pollinating insects
eocene
period of cenozoic; dominance of angiosperms
oligocene
period of cenozoic; primates apepar
pleioscene;
period of cenozoic; early bipeds
pleisteocene
period of cenozoic; ice age and humans
