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British Dictionary definitions for k/t boundary

K/T boundary

noun
  1. geology
    1. Cretaceous/Tertiary boundary: the time zone comprising the end of the Cretaceous and the beginning of the Tertiary periods
    2. (as modifier)K/T boundary sediments

Word Origin

C20 K and T, symbols for Cretaceous and Tertiary, respectively
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

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