The Leping Formation is well-developed in the Ping-Le downwarping belt in Jiangxi,which can be divided into three depositional regions according to lithological characters and biota.  The south region belongs
to an alternating marine-continental facies, consisting of marine mudstone and sandstone with coal intercalations.  
The north region changes to a marine facies, largely composed of thin-bedded siliceous limestone. The transitional region
lies between the above-mentioned two regions; there the Leping Formation can be divided into four members in descending
order as follows: 4. Janxi Member, abounding in ammonites including Sanyangites umfilicatus Zhao, Liang et Zheng,
S. obesus Zheng et Ma, Konglingites sp., and.Prototoceras sp.; 3, Zhongguling member, consisting of limestone
intercalated thin-bedded siliceous rock and mudstone, rich in ammonites and yielding Konglingiites sp.,? Araxoceras sp., Anderssonoceras sp. and Planidiscoceras sp. in the middle-upper part; 2. Renshansi member, composed of
thinbedded mudstone and siltstone with coal intercalation; and 1. Dongzigang member, composed of fine sandstone,
mudstone, mudstone with coarse-grained sandstone in the upper part, containing plant-remains, especially
Compsopteris sp., Otofolium polymorphum Gu et Zhi and Gigantopterides sp.
    The ammonites in the south area of the Ping-Le downwarping belt have been studied by Zhao Jin-ko, Liang Xi-luo and
Zheng Zhuo-guan, with three  zones recognized in descending order, namely, Sanyangites Zone; Araxoceras-
Konglongites Zone; and Anderssonoceras-Prototoceras Zone.  A new ammonite bed
(Zone), i.e. the Anderssonoceras dongshenlingense sp. nov.  Zone has been found by the writer within the arenaceous
limestone under theAnderssonoceras-Prototoceras Zone, which is the lowest ammonite bed in the Leping Formation
in Jiangxi.