Pupiao Fm
Type Locality and Naming
The type section is at Pupiao in Baoshan County, Yunnan. It is 780 m thick. The Pupiao Fm is derived from the Pupiao Bed proposed by C.J. Brown in 1916. The Pupiao Fm is derived from the Pupiao Bed proposed by C.J. Brown in 1916.
Brown named it the Pupiao Bed in 1916. In 1947, Sun Y.C. divided it into the Middle Ordovician Lower Pupiao Bed and Late Ordovician Upper Pupiao Bed. Zhang (1962) renamed it the Pupiao Fm, and subdivided it into two parts. Sheng Xinfu (1963) renamed Sun's Lower Pupiao Bed and Upper Pupiao Bed the Lower Pupiao Fm and Upper Pupiao Fm, which was widely accepted by the production units and institutes. Considering the similar lithology and fauna of the Lower Pupiao Fm and Upper Pupiao Fm, the present book merges these two formations into one, i.e., the Pupiao Fm.
Synonym: (蒲缥组）
Lithology and Thickness
The Pupiao Fm is dominated by yellowish green, yellow and purple siltstone, silty mudstone and marl. It is 780 m thick in type area.
Relationships and Distribution
Lower contact
It rests conformably on the sandstone and siltstone intercalated with marl at the top of the Shidian Fm
Upper contact
It is disconformably overlain by Silurian. Except other areas, it is conformably overlain by the Late Ordovician Wanyaoshu Fm at Libala in Shidian.
Regional extent
The Pupiao Fm, with a persistent lithology, is 50-1328 m thick, and is seen at Laojianshan (320 m thick) in Baoshan, Libala (307 m thick), Renheqiao (40-50 m thick), Liushui (205 m thick) and Zhenkang (1328 m thick) in Shidian.
GeoJSON
Fossils
Graptolite Husterograptus teretiusculus zone in the lower part, Climacograptus peltifer zone in the upper part, and trilobite Nankinolithus zone which is subdivided into lower Geragnostus sinensis-Sinoceras chinense subzone and upper Nankinolithus nankinensis subzone have been established within the Pupiao Fm.
Age
Depositional setting
Additional Information