Debao Fm
Type Locality and Naming
The type section is located at near Duowen Village, Qinjia of Yandong Town, 40 km southeast of Debao County. The name was proposed by Wu Y. and Yan C.X. in 1980 and is redefined here including the origional Duowen Mbr of Qinjia Fm and Duobang Mbr of Debao Fm because of their similar lithological features
Lithology and Thickness
The formation includes two members: A lower Duowen Mbr, 50 m thick, is characterized by dark grayish thin to medium thick bedded argillaceous limestones with siliceous bands; and a higher Duobang Mbr, 126.18 m thick, consists of thin to medium-bedded argillaceous limestone with siliceous bands, siliceous limestones with siliceous nodules or lenses, detrital limestones intrercalated with medium bedded dolomitic and cherty limestones. Horizontal beddings and sliding structures are commonly developed.
[Figure: Outcrops of Debao Fm near Duowen Village showing the thin bedded limestone. Note the thick bedded limestone in the lower part belongs Qinjia Fm]
Relationships and Distribution
Lower contact
Conformable on underlying Qinjia Fm
Upper contact
Conformably overlain by Qunping Fm
Regional extent
It is widely distributed in southwest Guangxi and southeast Yunnan
GeoJSON
Fossils
The fossils include: Dacryoconarids Nowakia praecusor longlinensis, N. pseudocancellata, N. barrandei in the Duowen Mbr, N. cancellata, N. ferula and Striatostyliolina paucicostata in the Duobang Mbr. Tabulate corals: Pachyfavosites cf. exilis, Favosites cf. spinosus, Thamnopora sp., and Rugose corals: Tryplasma sp. Breviphrentis sp. Conodont Polygnathus inversus in the Duobang Mbr
Age
Depositional setting
It is interpreted as an open carbonate platform and upper slope environments.
Additional Information