English Explanatory Dictionary

K-T boundary

English dictionary entry

Meanings

noun
  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.
  3. This transition is marked worldwide by a layer of material that contains a high level of iridium.

Word forms

K-T boundary K/T boundary KT boundary

Related words

K-T extinction event
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