chicxulub crater permian– triassic extinction event toba catastrophe theory vredefort crater triassic– jurassic extinction event younger dryas impact hypothesis list of extinction events quaternary extinction ordovician– silurian extinction events late devonian extinction wilkes land crater huronian glaciation eocene– oligocene extinction event carboniferous rainforest collapse capitanian mass extinction event bird extinction cat gap cambrian– ordovician extinction event silverpit crater olson's extinction end- ediacaran extinction cenomanian- turonian boundary event marinoan glaciation rajmahal traps fern spike lau event ireviken event tollmann's bolide hypothesis hindeodus toarcian turnover dresbachian mulde event aptian extinction
History_Geological history of Earth