Lantian Fm

Southernmost Anhui. The name of the Lantian Formation derived from the Lantian Series named by Ding Yi (J. Ting) in 1936, and was formally renamed as the Lantian Formation by Qian Yiyuan et at. in 1964. The typical section is situated north of the Lantian village in Xiuning County, Anhui Province. Coordinate: 29°55.00´ N.; 118°05.00´ E.

Synonym: （兰田组）

Basal part of the Lantian Fm is composed of gray manganiferous dolomite and spotted dolomite. Lower part consists of black, gray and greenish gray carbonaceous shale and mudstone; going upward it is siliceous carbonaceous shale interbedded with pelitic limestone. Upper part is dark gray and gray medium- bedded marly dolomite, dolomitic marl and limestone. Top part consists of dark gray and black thin-bedded carbonaceous silty slate and carbonaceous chert. The uppermost part is intercalated with potassic shale and stone coal with a total thickness of 269 m.

[Figure: The Nanhuan-Sinian strata in the Lantian section, Xiuning County, Anhui Province. A-The section of the Lantian Fm., B, C-Cap-carbonite of the Leigongwu Fm., D, E-The Lantian Fm., F-Dyke intruded into the Lantian Fm., G-The cover strata of Cambrian.]

The Lantian Fm in shale of the lower part yields different fossils: Microplants Asperatopsophosphaera umishanensis, Trachysphaeridium cf. rude, Protosphae- ridium sp., Lophosphaeridium sp., Taeniatum crassum; Algae: Bija sp., Epiphyton cf. durum, E. cf. gigam etc.worms: Paleolina sp., Macroscopic fossil algae: Chuaria circularis, Shouhsiennia sp.