Luowen Fm
Type Locality and Naming
East Guangxi. The Luowen Formation was erected by the Guangxi Regional Geological Survey Team in 1974. The section for the designation is in the Luowen Village of Rongxian of Guangxi.
Lithology and Thickness
The Luowen Formation is mainly represented by a set of purple red clastic sedimentary rhythms. Its Basal part is built up by purple red conglomerate; Lower part is conglomeratic sandstone, feldspar-quartz sandstone and sandy mudstone; Upper part is purple red clayey siltstone and mudstone. The formation is 800 m thick.
Relationships and Distribution
Lower contact
The base of the Formation marked by conglomerate is distinguished from tuffaceous lava of the Xidong Fm, and shows an unconformable contact with the latter. It shows an angular discordance with the Ordovician or the Silurian sediments in some basins.
Upper contact
The top of the formation has generally been denudated.
Regional extent
The formation mainly occurs in the southeast Guangxi. Its lithology is basically uniform and its thickness is varied in different basins. For example, it is 800 m in the Luocun Village of the Ziliang Basin, 513-816 m in the Taiping Basin, 451-1819 m in the Bobai Basin and 403-535 m in the Luwu Basin.
GeoJSON
Fossils
In the Jinji Basin, it yields ostracods Cypridea tera, C. porrecta, C. cuneata, C. anterotrancata, Talicypridea parallela; and Charophytes Obtusochara lanpingensis, Hornichara lagenalis.
Age
Depositional setting
It is of lacustrine deposition.
Additional Information