geologic timeline scale . labeled earth history scheme.

algae archean cambrian carboniferous cenozoic chronology cretaceous devonian diagram earth education eon epoch era evolution example explanation extinction geology gts hadean history human illustration infographic jurassic labeled mammal mesozoic mississippian nomenclature ordovician paleogene paleozoic pennsylvanian period permian proterozoic quaternary research scale scheme science silurian system table tertiary timeline triassic vector