permo-triassic boundary 二叠系三叠系界线
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。
youdao
应用推荐
模块上移
模块下移
不移动