Jinshui Fm
Type Locality and Naming
Northernmost Taiwan. The type section is located at about 17 km south to Jinshui Village, Miaoli County, Taiwan Province. It was named by Omura I. in 1928 and re-surveyed by Bureau of Geology and Mineral Exploration and Development of Fujian Province in 1992.
Lithology and Thickness
It is characterized by the dark grey shale, sandy shale intercalated with dark grey lenticular sandstone, siltstone and thin mudstone. Mud concretions and foraminifera fossils are abundant. Calcareous nannofossils, Gastropods and Bivalve fossils are also yielded. Combination of microfossils generally correspond to foraminifera zone N19-N21 and calcareous nannofossils zone NN12-NN17, correlative to top of Zanclean to center of Piacenzian. The thickness is 80-400 m.
Relationships and Distribution
Lower contact
Jinshui Fm is conformable contact to the underlying Guizhulin Fm of Sanxia Gr.
Upper contact
Jinshui Fm is conformable contact to the overlying Zhoulan Fm.
Regional extent
The formation is distributed in area between Taoyuan and Gaoxiong cities, western Taiwan and Jinshui Basin. The strata equivalent to the Jinshui Formation are called the “Tanshuixi bed” in the piedmont zone of Jiayi County and the “Zhutouxi bed” in the piedmont zone of Tainan County.
GeoJSON
Fossils
Pulleniatina obliquiloculata, Globorotalia tumida, Globorotalia tosaensis, Globigerinoides fistulosus, Reticulofenestra minutula, Discoaster pentaradiatus, Amanrolithus tricorniculatus.
Age
Depositional setting
It is interpreted as an epicontinental marine environment.
Additional Information