Jiuqu Fm
(97), Kungurian Stage (uppermost Cisuralian Epoch) through Guadalupian Epoch [latest-Early through Middle Permian]
Type Locality and Naming
The type section is located in the area of Jiuqu Cave, Hualian County, Taiwan. It is corresponding to the marble from the “Luoyuzhi Phase” in the “Sanzhui Bed” and the “Daqingshui Phase” of the “Tailuge Bed” named by Yan Cangbo (1963). It was named by Wang Zhiming in 1979.
Synonym: Jiuqu Bed
Lithology and Thickness
Marble and Dolomite. Composed largely of thick-bedded and massive marbles, comprising part of dolomite and schist, being possessed commonly of black-and-white alternating bands, with the marble representing in most cases grey-white thin layers intercalated with dark-colored carbonaceous substances. The mineral composition is predominated by calcite, with the dolomite occurring in concentration in the ptygmatic(??) and minilenticular forms. Dolomites are commonly associated with marbles in the form of lenses, thick layers or irregular blocks, which are sandwiched in the marbles, with their thickness being of several meters to tens of meters.
Relationships and Distribution
Lower contact
Upper contact
Regional extent
Distributed mainly in the Hualian County of Taiwan. This particular bed is distributed in the northeastern and western parts of metamorphic rocks series of the Dananao Gr (Danan'ao Gr), with a total length of 150 km.
GeoJSON
Fossils
Yan Cangbo et al., had discovered Fusulinida fossils such as the Schwagerina (?), Parafusulina (?) and Neoschwagerina (?) in the marbles occurring in the Nanzi, Dong’ao and Kusi areas, and corals as represented by Waagenophyllum in the Mata’an Stream area.
Age
Depositional setting
It is interpreted as a
Additional Information
Judging from the study on the Rb/Sr ratio of the marble, it is inferred that the marble should be formed at 190-310 Ma (Jiang Boming, 1984).