Nanzhuang Fm
Type Locality and Naming
Northernmost Taiwan. Lower formation of Sanxia Gr. The type section is located at Houlongxi, Miaoli County, Taiwan Province. It was named by Wang Y. in 1953 in Zhunan and Nanzhuang Towns, Miaoli County and re-surveyed and type assigned by Hao K. et al. in 1957.
Lithology and Thickness
It is characterized by the white thick sandstone, dark gray shale and interbeds of sandstone, fine sandstone and shale intercalated with available coal seam. Plant fossils are abundant, marine fossil is rare in north part. Fossils in partial formation in south of central Taiwan are represented by calcareous nannofossils, foraminifera and zoobenthos. Combination of microfossils generally correspond to foraminifera zone N12-N15 and calcareous nannofossils zone NN7-NN11. The thickness is 600-700 m.
Relationships and Distribution
Lower contact
Nanzhuang Fm is conformable in contact to the underlying Nangang Fm.
Upper contact
Nanzhuang Fm is conformable in contact to the overlying Guizhulin Fm.
Regional extent
The formation is distributed from north coast to southern Taiwan via Ali Moutain, and Hengchun Peninsula.
GeoJSON
Fossils
Operculina ammonoides, Ostrea sp., Globigerina sp., Catinaster coalitus, Reticulofenestra pseudoumbilica, Sphenolithus abies, Discoaster cf. hamatus, Globorotalia menardii, Globigerina nepenthus, Operculina ammonoides, Textularia alishanensis, Pseudorotalia indopacifica.
Age
Depositional setting
It is interpreted as a mixture of continental and marine deposits with coarse clastic rock intercalated with coal seam.
Additional Information