Zhongwo Fm
Type Locality and Naming
Yunnan Geological Bureau the first area survey team in 1966 named. The named section is located in Jidiping - Zhongwo, Heqing County, Yunnan Province.
Synonym: In 1962, Zhao Jinke et al. named this set of strata as the Lanping Fm, but did not specify a named section.
Lithology and Thickness
It is mainly composed of lime-black intermediate limestone and argillaceous sandstone, interbedded with marl, shale and sandstone layers. Chert nodules can be seen in the upper part, oolitic structures are common in the lower part of limestone, unstable bauxite beds are generally found at the bottom and chert nodules are found at the top. Its thickness is 191 ~ 230 m.
Relationships and Distribution
Lower contact
It is a pseudo-conformable contact with the underlying Beiya Fm of the Middle Triassic
Upper contact
It is a pseudo-conformable contact with the overlying Songgui Fm of the Upper Triassic.
GeoJSON
Fossils
Bivalves: Halobia yunnanensis, H. superba, Angustella cf. angusta. Ammonoids: Thisbites sp. Coral: Oppelismilia sp.
Age
Additional Information