Lunshan Fm

The type section is at Lunshan in Jurong, Jiangsu. The Lunshan Fm is derived from the Lunshan Limestone proposed by Ding Wenjiang (V.K. Ting) and Ye Liangfu (L.F. Yih) in 1919. In 1877, Richthofen F. from Germany first found the Ordovician at Lunshan in Jurong, Jiangsu, and named it the Lunshan Limestone, which was followed by Ding and Ye (1919), Liu Jichen and Zhao Rujun (1924). In 1933, Yu Jianzhang (C.C. Yu) defined the Lunshan Limestone to be Early-Middle Ordovician. In 1935, Li Yuyao (Y.Y. Lee) et al. restricted the Lunshan Limestone to the lower part yielding Camerocears of the previously defined Lunshan Limestone. In 1954, Mu Enzhi renamed it the Lunshan Fm, and divided it into two parts. Jiangsu Team of Regional Geological Survey (1970) further studied the Lunshan Fm, and restricted it to the lower part of Lunshan Limestone of Mu et al. (1954), a suggestion was followed by Yu Jianhua (1979), Chen Huacheng et al. (1989) and Anhui Bureau of Geology and Mineral Resources (1987).

Synonym: (仑山组)

The formation is dominated by dolomite. In the type area, the Lunshan Fm is 132.5 m thick.

In Nanjing, the Lunshan Fm yields conodont of Monocostatus simplex assemblage, Acanthodus costatus “Acodu” onentensis assemblage, Scolopodus quadraplicatus-Drepanodus subarcustus assemblage, in ascending order. Moreover, trilobite, graptolite, brachiopod and cephalopod also have been found from the Lunshan Fm.