Cover Story：Geological section of the Permian-Triassic boundary at Ombu Dangsang, Gegyai County, Tibet. High SHRIMP Ⅱe-MC microarea and in-situ isotopic analyses of the conodont fossils from this section revealed the sudden decrease of the ratio from 20.90‰ to 19.03‰, which corrsponded to the grave global warming event at the end of Permian period and indicated the sudden rise of the temperature of the seawater at the surface of the Tethys Sea lying at middle-high latitude by about 8.2℃ at that time. This finding has provided important evidence for the greatest mass extinction event of biota in Phanerozoic eon. The research achievement directed by professor LIU Dun-yi of Institute of Geology, CAGS, ranks the fifth among “Top Ten Scientific and Technological Progresses of CAGS in 2011”. (Photo by LIU Dun-yi, JI Zhan-sheng)
