Xicun Fm
Type Locality and Naming
Xueshan range, north Taiwan. The naming section at Xicun Village at the Beiheng Highway ~40 km southeast of Taoyuan County, Taiwan. Named the “Xicun bed” in 1931.
Synonym: Xichun Fm
Lithology and Thickness
Lying above the Dajian Fm and below the Sileng Fm, the Xicun Formation is composed of dark gray slate and phyllite with well-developed foliation, intercalated with dark gray, hard, medium to coarse quartz sandstone. Such intercalations are mostly found in the lower part of the formation. The thickness of the formation is ~600 m. The total thickness is 1400 to 3000 m.
Relationships and Distribution
Lower contact
It has a conformable contact with the underlying Eocene Dajian Fm.
Upper contact
It has a conformable contact with the overlying Oligocene Sileng Fm.
Regional extent
This formation is mainly distributed in an area from Xicun of Taoyuan County to Yuanshan of Ilan County, with its chief outcrops forming a narrow zone in the axial region of an anticline, and also occurs sporadically in an area from Jiayang of Taichung County to Jade Mountain.
GeoJSON
Fossils
Because no fossils that can determine the age have been found, the age of the Xicun Formation cannot be determined. According to its conformable contact with its overlying Sileng and discovery of the foraminifera Globigerinoides and Assilina sp., its age is inferred to be Late Eocene.
Age
Depositional setting
Additional Information