Xiajiaqiao Fm

It was named by the Jiangxi Party of Regional Geological Survey (1963) and published by the Compiling Group of Regional Stratigraphical Scale of Jiangxi Province in 1980. The type section is located at Xiajiaqiao, 20 km northwest to the Wuning County, Jiangxi Province.

Synonym: (夏家桥组)

The formation, 680 m thick at the type section locality, is composed of gray green silty mudstone, mudstone interbedded with siltstone and fine-grained sandstone, purplish red siltstone, pelite and micritic sandstone, often intercalated with yellow green, gray green silty or micritic sandstone. The gray green thick-bedded sandstone is common at the lower part of this formation.

The formation is rich in fossils of trilobites Rongxiella, Kailia, Coronaspis, Coronocephalus; brachiopods Eospirifer, Striispirifer, Nalivkinia, Nucleospira；bivalves Actinopteria, Leptodesma, Orthonota and gastropods, etc.