Geological time By Elisa681 Period: 541 BCE to 250 BCE Palaeozoic ERA Age of invertebrates Period: 539 BCE to 485 BCE Cambrian Period: 485 BCE to 444 BCE Ordovician widespread marine algaes 450 BCE widespread marine algae Period: 443 BCE to 419 BCE Silurian Period: 419 BCE to 359 BCE Devonian Period: 359 BCE to 299 BCE Carboniferous Period: 299 BCE to 252 BCE Permian Period: 252 BCE to 66 BCE Mesozoic ERA Period: 251 BCE to 201 BCE Triassic Period: 201 BCE to 145 BCE Jurassic Period: 145 BCE to 66 BCE Cretaceous Period: 66 BCE to 1 BCE Cenozoic ERA Period: 66 BCE to 2 BCE Tertiary Period: 3 BCE to 50 Quaternary
