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| Description: Earth scientists have devised a scheme to divide the planet’s natural history into distinct time frames. The geologic column uses a hierarchical system dividing time into eras, periods, and epochs. Segments are based on geologic and fossil evidence of past environmental conditions and events. Picture Stats: Views: 335 Filesize: 62.77kB Height: 995 Width: 312 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=31077 |