1:250 000 Baidoico and Angdarco Sheets in Xizang

Nine formal and four informal lithostratigraphic units have recently been established. The Upper Triassic Rigain Punco Group is dismembered into six lithostratigraphic units, including Jiangzhong, Nongbai, Jiangzhuangri, Zhana, Duogaila and Suobucha Formations. The Middle and Upper Jurassic Yanshiping Group is redivided into Biluoco, Longba and Nicha Formations. The Sewa Formation is subdivided into the upper, middle and lower members. The Muggar Kangri Group in the Bangong-Nujiang suture zone is dismembered into four lithostratigraphic units:Muggar Kangri Group Complex, Tarenben oceanic-island basalts, Tukari Formation and Shamuluo Formation. The plant fossils Otozameites nalajingensis are firstly collected from the Upper Triassic Jiangzhong Formation, and the fish fossils Actinopterygii from the Lower-Middle Jurassic Sewa Formation in the Qiangtang Basin. Eight mappable intrusive units of Late Jurassic to latest Neogene ages are constructed. The recent develepments also include the recognition of oceanic-island basalts in the Tarenben region of the Bangong-Nujiang suture zone, Cenozoic magmatic rocks, small beaded porphyry masses in the Bangong-Nujiang suture zone and South Qiangtang Basin, and youngest pillow basalts in the Bangong-Nujiang suture zone.