Luomai Fm
Type Locality and Naming
The type section is located at east of Dale Village in Xiangzhou County. It was named by Bai S.L. & Ning Z.S. in 1982.
Lithology and Thickness
Shallow-marine marl. It is dominated by earth-yellow, green-yellow mudstone composed mainly of hydromica clay minerals, intercalated with bioclastic and micritic limestone, which are more developed in the upper. Few dolomitic limestone and algal limestone are observed. Main fossils are brachiopods and bivalves. It is 120.7 m thick.
Relationships and Distribution
Lower contact
Contact with underlying Tonggen Fm is not clear because of poor exposures in the drilling hole.
Upper contact
Contact with overlying Guanqiao Dolomite Fm is also unclear
Regional extent
This formation is restrictively distributed in the Dale area, west side of Dayaoshan
Mt.
GeoJSON
Fossils
It contains relatively numerous Bivalves Actinoperia sp., Goniophora sp., Goniophoriopsis sp., Pholadella sp., Mulationella sp., Newellipecten sp., Mytilarca sp., Modiomorpha sp., Orthomota sp., Paracyclas sp., Schizodus sp., and lower diversity Brachiopods Howellela sp., Delthyris s., Chonetes sp., Orientospirifer wangi. Few Nowakia longlingensis and Conodont Polygnathus perbonus have been reported
Age
Depositional setting
It is interpreted as a shallow subtidal sedimentary environment
Additional Information