QiguDev Fm
Type Locality and Naming
The type section is located at Zayuhe, upper reaches of Chelagou River, Tanchang County of Gansu Province. It was named by Li Youngjun and Yang Tianxi in 1987 and published by Li Youngjun in 1989. [Called "QiguDev" here, because there is another Qigu Fm in the latest Jurassic of Junggar Basin of Xinjiang, NW China.]
Lithology and Thickness
Limestone. The Lower part consists of thin- and medium-bedded limestone intercalated with calcareous slates and a few breccia limestones. The Upper part consists of thick-bedded nodular limestone. The recorded outcropping thickness is 802 m.
Relationships and Distribution
Lower contact
The base is a conformable contact with the slates of the underlying Longlinqiao Fm.
Upper contact
The outcrops lack an upper contact to an overlying formation.
Regional extent
GeoJSON
Fossils
The fossils are conodonts Palmatolepis g. gracilis, P. d. delicatula, P. subperlobata, and brachiopoda Yunnanellina spp.
Age
Depositional setting
Additional Information