Guanmenshan Fm
Type Locality and Naming
Northeast Liaoning. The Guanmenshan Fm was named by the No.9 Party of Geology, Liaoning Bureau of Geology and Mineral Resources in 1989. The type section is at Wuchong in Shangnianmazhou, Fushun County, Liaoning Province. It is the upper formation of the Sanchazi Gr.
Synonym: （关门山组）
Lithology and Thickness
The Guanmenshan Fm is a set of neritic-littoral carbonate rock sediments. It is totally composed of dolomite. Lower part consists of medium- to thick-bedded fine-crystalline dolomite. Middle part is medium- to thick-bedded, laminated (banded) fine- crystalline dolomite and pisolitic dolomite. Upper part is psephitic and psammitic dolomite Laterally, it is stable in lithological character, but changeable greatly in thickness. It is up to 1437 m in Kangzhuangzi-Guanmenshan area, Kaiyuan County.
Relationships and Distribution
Lower contact
It is resting conformably on the underlying Kangzhuangzi Fm (the middle formation of the Sanchazi Gr).
Upper contact
Conformably overlain by the Tongjiajie Fm (lowest formation of Shuyatun Gr.)
Regional extent
Northeast Liaoning. It is widely distributed in the Fanhe River area.
GeoJSON
Fossils
The representative elements of stromatolites are Confusoconophyton cf. multiangulum, Conophyton cylindricum, Jacutophyton f., etc.
Age
Depositional setting
Neritic-littoral
Additional Information