Definitions for k-t boundary

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  1. K-T boundary(Noun)

    The geological signature of the transition between the Cretaceous period and the Tertiary period 65.5 million years ago.This transition is marked worldwide by a layer of material that contains a high level of iridium.

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"k-t boundary." Definitions.net. STANDS4 LLC, 2014. Web. 23 Nov. 2014. <http://www.definitions.net/definition/k-t boundary>.

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