K-T boundary

短语

别名

K/T boundary KT boundary

释义与例句

n.
  1. 1.

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

  2. 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.

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