Sunuolin Fm
Type Locality and Naming
The type section is located at Langjiexue and the north slope of Zhela Mount in Gongga Country, Tibet. It was named as Sunuolin Member by South Tibet Geological Team of Tibet Geological Bureau in 1963, and then renamed as Sunuolin Fm by Wang Naiwen in 1983.. Lower formation in the Niru Gr?
Synonym: Sunorin Fm, Sunolin Fm (spellings). The Triassic strata in the area of Zhongba and Lazi in Tibet were first named Lazi Group (Comprehensive Team of Tibet, Chinese Academy of Sciences, 1962) that was later used in the Cretaceous by Wu Haoruo (1977). The Upper Triassic part of the strata was named as the Langjie Fm by the southern Tibetan geological team of the Tibet Geological Bureau in 1963 and was divided into the Sunuolin, Chicun and Chola Members from in order. The Second Geological Team of Tibet Geological Bureau, Wuhan Geological Institute (1976), and Institute of Geology of Chinese Academy of Geological Sciences (1977) successively renamed the Langjie Fm as Qiongjie Gr and Yangzhuoyong Gr respectively. In 1983, Wang Naiwen et al. changed the rank of Langjie Fm to Langjie Gr, and elevated the Sunorin Member and Chacun Member to formations accordingly, representing the Carnian and Norian of Late Triassic respectively
Lithology and Thickness
This formation, 1397 m thick, mainly consists of flysch composed of yellowish-green and grayish-yellow shale and slate.
Relationships and Distribution
Lower contact
The contact relationship with the underlying Lower Permian is unclear.
Upper contact
Conformably overlain by the Zhecun Fm of Norian.
Regional extent
The formation is restrictively distributed at Jiedexie of the south bank of Brahmaputra River and northern Yangzhuoyongcuo of Zhela Mount in southern Tibet.
GeoJSON
Fossils
Ammonoids: Tropites sp.; Bivalves: Halobia cf. striata.
Age
Depositional setting
It is interpreted as turbidity sediment.
Additional Information