Permo-Triassic
/ˈpɜːməʊˌtraɪæsɪk/adjective
1- Geology of, relating to, or occurring at 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.【地质】（与）二叠纪和三叠纪边际（发生）（有关）的。
1.1
- of or relating to the Permian and Triassic periods or rock systems considered as a unit（与）二叠纪和三叠纪（有关）的; （与）二叠纪与三叠纪岩系（有关）的。
1.2
- as noun the Permo- Triassic 或 Permo-Trias the Permian and Triassic periods together or the system of rocks deposited during them二叠纪与三叠纪; 二叠纪与三叠纪岩系。