Xisha Fm
Type Locality and Naming
South China Sea – Xisha islands. The type section is located at Xiyong Well No.1, Xisha Islands ("Paracel Islands"). It was named and surveyed by Wang C. et al. in 1976, published in 1979.
NOTE: There is not a standardized regional lithostratigraphy for the Xisha islands; nor for the nomenclature in the reference wells.
Synonym: Sanya Fm and Meishan Fm?
Lithology and Thickness
It is characterized by the grayish white calcareous algae- dolomite in Lower part; dolomitic limestone with bioclast in Bottom part; grayish white bioclastic limestone. Foraminifera, sporopollen, coral and algae fossils are yielded. The thickness is 401 m.
Relationships and Distribution
Lower contact
It is unconformable in contact to underlying bedrock.
Upper contact
It is conformable in contact to overlying Xuande Fm.
Regional extent
The formation is distributed in area around Xisha Islands ("Paracel Islands").
GeoJSON
Fossils
Nephrolepidina morgana, Quinqueloculina spp., Triloculina sp., Pyrgo sp., Peneroplis pertusus, Amphicoryna sp., Ficus- Rhizophoraceae.
Age
Depositional setting
It is interpreted as an atoll environment.
Additional Information