Falang Fm

Xu Deyou was named in 1944. The named profile is located in Longchang, Zhenfeng County, Guizhou. Le Senpi (1929) discovered fossils in Nanfalang Village, Guanling County, Guizhou Province. In 1944, Xu Deyou referred to the fossil-bearing strata as the "Franch layer". The Franco Formation was formally used as a stratigraphic unit in "China Regional Stratigraphic Table (draft)" (1956). In 1977, the Triassic Formation of the Southwest Stratigraphic Team of the Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, based on the original field records of Xu Deyou and Chen Kang in 1942, divided the Franc Fm into the Zhuganpo Fm with limestone in the lower part and clastic rock in the upper part. The main section was Lai Shike (Laishike). In 1978, the Guizhou 108 District Transfer Team changed the Laishike section to the Laishike Group. In 1987, the Guizhou Bureau of Geology and Mineral Resources delineated the limestone strata in the lower part of the Laishike Fm, which was also called the "Wayao", and belonged to the Farang Fm. The Laishike Fm refers to the clastic rocks above it. This lexicon follows the meaning of the Laishike section redefined by Wang Yigang (1983), and assigns the "Longchang " to the overlying section of mainly clastic rock.

Synonym: Franc Fm, Franco Fm. Upward succession of the Zugangpo Fm, Wayao Fm, and Laishike Fm for the current three divisions?

Temporary, pending clarifications: Upward succession of the Zugangpo Fm limestone, Wayao Fm sandy claystone, and Laishike Fm sandstone for the current three divisions?

In 1983, Wang Yigang, based on the original meaning of Xu Deyou and Chen Kang, believed that the Laishike section should be the formation of the Trachyceras multituberculatum ammonoid group and the Protrachyceras deprati ammonoid group. "Dragon Field".