Goyu Fm
Type Locality and Naming
The type section is at Guqin in Goyü district, Zayü County, eastern Xizang. The Goyü Fm was named by Chen Ting'en (1986a).
Synonym: (古玉组）; Goyü Fm
Lithology and Thickness
The formation is dominated by purple medium-bedded banded argillaceous limestone, with shrinkage lamination and syngenetic breccia structures. In the type area, the Goyü Fm is 25 m thick.
Relationships and Distribution
Lower contact
It rests conformably on the dark gray argillaceous limestone of the Zayu Fm
Upper contact
It is conformably overlain by an undated sequence of dolomite and dolomitic limestone without any fossils.
Regional extent
The Goyü Fm is exposed in Guqin and Haitong.
GeoJSON
Fossils
The Goyü Fm yields Nautiloids Discoceras sp., Trocholites depressus, Richardsonoceras asiaticum, Michelinoceras paraclongatum and Sinoceras sp. At Haitong area, this unit also yields Lituites sp.
Age
Depositional setting
Additional Information