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British Dictionary definitions for geological timescale

geological timescale

noun
  1. any division of geological time into chronological units, whether relative (with units in the correct temporal sequence) or absolute (with numerical ages attached)
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012