K-T boundary

noun

The geological signature of the transition between the Cretaceous period and the Tertiary period 65.5 million years ago.

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Meanings

noun

alternative K/T boundary · alternative KT boundary

  1. The geological signature of the transition between the Cretaceous period and the Tertiary period 65.5 million years ago.
  2. 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.
    1. This transition is marked worldwide by a layer of material that contains a high level of iridium.
Cite this entry
APA

K-T boundary. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/K-T%20boundary

MLA

“K-T boundary.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/K-T%20boundary. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “K-T boundary,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/K-T%20boundary.

Source: K-T boundary on Wiktionary, CC BY-SA 4.0.