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| Description: Divides geologic history into units Originally created using relative dates Subdivisions Eon Greatest expanse of time Four eons Phanerozoic (“visible life”) – the most recent eon Proterozoic Subdivisions Eon Four eons Archean Hadean – the oldest eon Era Subdivision of an eon Subdivisions Era Eras of the Phanerozoic eon Cenozoic (“recent life”) Mesozoic (“middle life”) Paleozoic (“ancient life”) Eras are subdivided into periods Periods are subdivided into epochs Picture Stats: Views: 375 Filesize: 535.59kB Height: 921 Width: 857 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=39582 |