Definition of Permo–Triassic in English:

Permo–Triassic

Line breaks: Permo–Triassic

adjective

Geology
1Relating to or denoting the boundary of the Permian and Triassic periods, about 245 million years ago. Mass extinctions occurred at this time, marking the end of the Palaeozoic era.
1.1 (as noun the Permo–Triassic or Permo–Trias) The Permian and Triassic periods together or the system of rocks deposited during them.

Definition of Permo–Triassic in:

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