摘要:Rheatian and Hettangian Ammonoid Assemblages from the Tibetan Himalayas and Their Pan-Tethyan Correlation YIN Jiarun(China University of Geosciences, Beijing 100083) On the basis of new collections from the Lanongla area, Nyalam County, Tibet, Rheatian and Hettangian ammonoid assemblages are recognized, including the Choristoceras marshi, Neophyllites-Choristoceras, Psiloceras calliphyllum and Discamphiceras pleuronotum assemblages. As the only Triassic and Jurassic boundary …
