Siling Fm
Type Locality and Naming
Xueshan range, north Taiwan. The naming section is located at Siling Village ~40 km southeast of Taoyuan County, Taiwan. Named the “Siling sandstone” in 1931.
Lithology and Thickness
Predominantly thick-bedded, light gray and grayish white, medium- to coarse-grained, siliceous sandstone or quartzite with dark gray shale or slate, carbonaceous shale and coal or graphite lenses. Cross bedding and ripples are common in sandstone. its thickness varies from place to place greatly: it is ~350–over 700 m in the northern part of the Hsuehshan (Xueshan) Mountains, 500–2500 m in the central part of the mountains and 200–600 m or more in the eastern part of the mountains.
Relationships and Distribution
Lower contact
It has a conformable contact with the underlying Xicun Fm
Upper contact
It has a conformable contact with the overlying Shuichangliu Fm (Gangou Fm).
Regional extent
This formation is mainly distributed in Taoyuan, Miaoli, Nantou, Taichung and Ilan, extending from Yuanshan southwest of Ilan County southward through the Hsuehshan Mountains to the eastern side of Hsinyi southeast of Nantou County. It is ~140 km long from north to south and 1–25 km wide.
GeoJSON
Fossils
This formation contains some foraminifera, bivalves and gastropods. The foraminifera include planktic Globigerina ampliapertura, G. ciperoensis and G. praebulloides and benthic Gaudryina hayasakai, belonging to zones P19 to P22; bivalves include Paphia taiwanensis and Crassatella suboblongata; gastropods include Turritella izumoyamana etc.
Age
Depositional setting
The Siling Formation is littoral deltaic or neritic deposits occurring in an environment where periodic transgressions and regressions took place frequently.
Additional Information