Selong Gr
Type Locality and Naming
The type section is located in the West Hills of the Selong Village to the north of the Shisha Pangma Peak in the Nyalam (Nielamu) County, Tibet. It was named by the Shisha-Pangma Pk.-Scientific Investigation Team in 1964, and was issued publicly in 1981.
Lithology and Thickness
Clastics and Limestone. Consists of the upward succession of Qubu Fm, Quburiga Fm, and Baga Fm. The group represents a marine transgression sequence composed of interbeds of littoral coarse- to fine-grained clastic deposits and littoral fine clastic rock-bio-limestone. Within the Selong Gr itself there seems to be a series of important depositional breaks. Total thickness is 400 m.
Relationships and Distribution
Lower contact
Conformable contact with the underlying Jilong Fm
Upper contact
Disconformable contact with the overlying Tulong Fm of the Early Triassic Epoch
Regional extent
Distributed in the Dingri, Dingjie, Jilong and Nielamu areas of the Himalayan Stratigraphic Region.
GeoJSON
Fossils
Qubu Fm in its lower part yields the Glossopteris flora.
Lower layer of the Quburiga Fm in its upper part yields ammonoids represented by Uraloceras, the middle and upper parts of the formation yield brachiopods represented by the Taeniothaerus assemblage and the Chonetella nasuta assemblage.
Baga Fm in its top part yields conodonts Clarkina aff. Changxingensis, etc., which might probably belong to the Changhsingian Stage (but dashed as Wuchiapingian on Permian lexicon chart column 54).
Age
Depositional setting
It is interpreted as a marine transgression sequence.
Additional Information