1:250 000 Rixin, Zanda and Gya'nyima Sheets in Xizang

The delineation of the strata includes the Shiqipo and Pulu Formations in the Northern Himalayan stratigraphic subprovince and the Carboniferous Yali and Naxing Formations in the eastern part of the surveyed areas. There is no evidence on the Carboniferous palaeouplifts in the area east of Zanda. The Nyalam Group Complex indicates a Palaeoproterozoic age. The disintegration of the formerly Xiukang Group and Jurassic-Cretaceous strata and formerly Yarunaga Formation, and subdivision of the formerly Dachang Group help improve the understanding of the Carboniferous stratigraphic systems in the Yarlung Zangbo stratigraphic province. The Weila Pecten is recognized for the first time in the Pupuga and Nieniexiongla Formations in the Ngari region. The early Paleocene planktonic foraminifera are also identified for the first time in Xizang. The intrusive rocks in the southern Gangdise volcanic magmatic arc zone are grouped into ten mappable intrusive unitsformed during the Cretaceous, Paleogene and Neogene, respectively. The Yarlung Zangbo suture zone is divided into northern and southern tectonic mélange zones and Zanda-Zhongba microlandmass, of which the northern and southern mélange zones may be subdivided into nineteen mappable units. The Early Jurassic mélanges and sandy and muddy melanges with the Paleogene matrix are also recognized for the first time in the northern zone.