Definition of K-T boundary
: the transition between the Cretaceous and Tertiary periods of geologic time characterized by a mass extinction of many forms of life including the dinosaurs
also
: a geologic stratum marking this boundary
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“K-T boundary.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/K-T%20boundary. Accessed 26 Feb. 2021.
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The first known use of K-T boundary was in 1983
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