Geological Time Scale Cretaceous Period Geological Events Mass Extinctions Mesozoic Era Triassic Period Climate History Geological History Jurassic Period Geological Periods Paleozoic Era Precambrian Era Prehistoric Life Mass Extinction Events Planetary Formation Ordovician Period Ice Ages Evolution Climate Events Asteroid Impacts Formation of Earth Carboniferous Period Paleoceanography Paleoclimatology Hadean Aeon Pleistocene Era Meteor Impacts Permian-Triassic Extinction Pleistocene Epoch Fossils Extinction Events Ancient Craters Cretaceous Extinction Neoproterozoic Era Geological Processes Climate Evolution Pleistocene Climate Devonian Period Early Earth Cryogenian Period Paleoarchean Era Biodiversity Great Oxidation Event Atmospheric Evolution Ancient Life