Geological Time By Matisus 541 BCE Phanereozoic Eon 541 BCE Paleozoic Era 541 BCE Many marine Invertebrates with external skeletons (arthropods) Period: 541 BCE to 2020 Phanerozoic Eon Period: 541 BCE to 252 BCE Paleozoic Era Period: 541 BCE to 485 BCE Cambrian Period 485 BCE Widespread marine algae Period: 485 BCE to 444 BCE Ordovisian Period 444 BCE First land plants Period: 444 BCE to 419 BCE Silurian Period 419 BCE fish diversity/first amphibians Period: 419 BCE to 359 BCE Devonian Period 359 BCE Forest of giant ferns Period: 359 BCE to 299 BCE Carbiferous Period 299 BCE Reptiles diversity Period: 299 BCE to 252 BCE Permian Period 252 BCE First dinosaurs/First mammals 252 BCE Mesozoic Era Period: 252 BCE to 201 BCE Triassic Period Period: 252 BCE to 66 Mesozoic Era 201 BCE Plants dominate,first flying reptiles, first birds... Period: 201 BCE to 145 BCE Jurassic Period 145 BCE Extintions dinosaurs Period: 145 BCE to 66 BCE Cretaceous Period 66 BCE First plants with flowers 66 BCE Cenozoic Era Period: 66 BCE to 2020 Cenozoic Era Period: 66 BCE to 2 BCE Tertiary Period 2 BCE Develpment and diversification of mammals Period: 2 BCE to 2020 Quaternary Period
