Permo-TriassicBNC⁵⁰⁹⁹⁸ 基本例句 🌏二叠-三叠纪的 Several new data on the Upper Permian and Permo-Triassic boundary in Huangshi area are reported in the paper, A number of significant fossils were collected from these stratigraphical units. 笔者近年对黄石地区上二叠统及下三叠统进行了研究，采到了有时代意义的化石。 cnki