-
Cambrian Period 570 - 500 Mya
Palozoic - Had an abundant amount of life in the ocean. -
Ordovician Period 485 - 440 Mya
Palozoic - Marine invertebrates dominant. -
Silurian Period 443 - 416 Mya
Palozoic - Earliest terrestrial plants and animals. -
Devonian Period 419 - 358 Mya
Paleozoic - Earliest ampibians and ammonites. -
Carboniferous Period
Paleozoic - Earliest reptiles. -
Permian Period 300 - 252 Mya
Paleozioc - Extinction of many kinds of marine animals, including trilobites. -
Triassic Period
Mesozoic - Earliest dinosaurs. -
Jurassic Period
Mesozioc - Abundant dinosaurs and ammonites. -
Cretaceous Period
Mesozoic - Climax of dinosaurs, followed by extinction. -
Tertiary Period
Cenozoic - Non-avian dinosaurs died off, early ice age. -
Quaternary Period
Cenozoic Period - Humans were dominant.