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K/T boundary

British

noun

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

"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

Etymology

Origin of K/T boundary

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

Example Sentences

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See Examples For:

K/T boundary

Centrosaurines went extinct millions of years before the chasmosaurines that were wiped out with the rest of the non-avian dinosaurs at the K/T boundary.

From Forbes ● Jun. 4, 2015

But then came the stunning discovery by Luis and Walter Alvarez, father and son scientists, who while studying a clay layer marking the K/T boundary in Italy found striking amounts of iridium.

From Washington Post ● Dec. 11, 2014

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023