Moshan Fm
Type Locality and Naming
It was named by the Regional Survey Party of Anhui Province in 1980. The naming section is located on the northern slope of Lali Peak on the western side of the Moushan Mts in Huaining County of Anhui Province.
Synonym: （磨山组）; Moushan Fm (spelling)
Lithology and Thickness
it can be divided into two parts. Lower part being composed mainly of grey-white medium-grained clastic quartz-sandstones, intercalated with a small amount of carbonaceous shales and siltstones, and with its basal part consisting of pebble-bearing sandstones or conglomerates, being about 275 m thick. Upper part being composed of grey, grey-black and grey-green fine-grained feldspar-sandstones, siltstones, sandy shales and carbonaceous mudstones, intercalated with lenticular coal beds, with a thickness of about 374 m.
Relationships and Distribution
Lower contact
Its basal part disconformably overlies the upper Triassic Lalijian Fm, or the middle Triassic Tongtoujian Fm.
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Luoling Fm
Regional extent
The formation is distributed largely in the Ma’anshan, Lujiang-Zongyang and Huaining Basins. The lithology and thickness of the formation are slightly changeable from region to region. In the Ma’anshan region it is about 400-989 m thick, and is composed mainly of grey-white quartz-sandstones and feldspar-quartz-sandstones, with its basal part representing pebble-bearing quartz-sandstones, or conglomerates; westerly till the Zongyang Basin the thickness of the formation reaches to 649-1174 m; and while in the Huaining Basin its thickness is getting smaller, being of 100-704 m. The coal-bearing horizons are stable, commonly in an amount of 1-5 coal beds.
GeoJSON
Fossils
The formation yields such bivalve fossils as Pseudocardinia kweichouensis, Pisidium cf. fujianense and Tutuella cf. crassa; plant fossils belonging to the Todites princeps-Ptilophyllum assemblage of the Dictyophyllum-Clathropteris flora consisting of 20 genera and 32 species, whose important members are Neocalamites carrerei, Conipteris hymenophylloides, Todites princeps, Clathropteris meniscioides, Ptilophyllium contiquum, P. pectin and Otozamites hsianchiensis.
Age
Depositional setting
The formation belongs to coal-bearing deposits of fluvial, lacustrine and swamp facies.
Additional Information