Zhanongema Fm
Type Locality and Naming
It was named by Lin Baoyu in 1981. The type section is located at the hill ridge, west of the road, 12 km north of Yongzhug Township, Xianza (Kangsangdobdê) County, the Xizang Zizhiqu.
Synonym: (扎弄俄玛组) ; Mengdeeyue Fm -- The Mengdeeyue Fm, once had been considered as the overlying strata, is actually a synonym of Zhanongema Fm (Bureau of Geology and Mineral Resources of Xizang Zizhiqu, 1997).
Lithology and Thickness
It consists of grayish white medium- to thick-bedded dolomitic limestone. It is 32 m thick.
Relationships and Distribution
Lower contact
The formation conformably rests onto the underlying Dewukaxia Fm
Upper contact
The formation conformably rests below the overlying Dardong Fm of early Devonian
Regional extent
It is 76.5 m thick at 4 km north of the Daerdong Section with no considerable variation in lithology, lithofacies and faunas. It is only exposed in northern part of Xianza County.
GeoJSON
Fossils
The formation yields abundant conodonts, mainly being the Pterospathodus amorphognathoides zone and the Spathognathodus sagitta bohemicus zone.
Age
Depositional setting
Additional Information