Jialingjiang Fm

The type section is located at Jialing River north shore, Guangyuan City, Sichuan Province. It was named by Zhao Yazeng and Huang Jiqing et al. in 1931. It was first used by the National Stratigraphy Conference in 1959.

Synonym:

Dominated by carbonate rocks, the Yanjingxi section in Hechuan, Sichuan Province can be divided into three lithological sections: First member is composed of gray microcrystalline limestone with many fragments, sand and gravel fragments and a small amount of oolitic microcrystalline limestone. The crisscross layers of insect traces, oolites, flat gravels and sand waves form dozens of rhythms, with stromatolites developed in the lower part, with a thickness of 241 m. Second member is dominated by gray microcrystalline dolomite, with microcrystalline limestone in the middle, and a layer of gypsum-soluble breccia in the upper and lower parts, with stromatolites, crumbs, sands and oolitic bands, 70 m thick. The lower part of the Third member is brown gray, gray microcrystalline limestone, often with insect traces, sometimes containing thin layers of scutella, sand debris, and spangled oolitic limestone, sometimes with horizontal stratification, and the upper part is gray microcrystalline limestone and sandy gravel and meso-clastic sprite limestone are interbedded with different thicknesses, and glutenous clastic limestone has oblique bedding, with a small amount of silty dolomite interbedded near the top, with a thickness of 198 m.

Bivalves: Entolium discites microtis, Eumorphotis sp., Myophoria ovata; Conodonts: Parachirognathus ethimom, Neospathodus homeri, Neospathodus triangularis, Pachycladina sp. Ammonoids: Tirolites sp.; Plants: Neocalamites hoerensis.

It is interpreted as sub-tidal to upper-tidal deposits.