Batang Gr
Type Locality and Naming
Qinghai Geological Bureau the first area survey team named in 1972. The named section of the Batang Group is located in Batang, Yushu County, southern Qinghai, and the group represents the Yushu area in southern Qinghai.
Synonym:
Lithology and Thickness
The Batang Gr is a complex set of volcanic-sedimentary rock series, which can be divided into five rock groups from bottom to top: (1) Purplish red and grayish green feldspar quartz sandstone with a thickness greater than 1859 m; (2) Gray sandstone interbedded with acid volcanic lava and pyroclastic rock, which is mainly volcanic rock locally and has a thickness of 1050-3400 m; (3) Gray white medium thickness stratified limestone with a small amount of sandstone, some areas with a large number of volcanic rocks and pyroclastic rocks, the thickness of more than 2000 m; (4) Dark gray medium-fine grained quartz sandstone, argillaceous and carbonaceous shale, locally interbedded with a large number of volcanic rocks, pyroclastic rocks and limestone lenses, the thickness is greater than 3930 m; (5) Gray white medium thickness stratified micro-clastic rocks with a small amount of sandstone and slate, with a thickness greater than 542 m.
Relationships and Distribution
Lower contact
The initial occurrence of purplish red sandstone and gray-white micro-clastic rocks are the mark of the bottom boundary of the Batang Gr, and the contact relationship with the underlying beds (Benpulong Fm) is unclear.
Upper contact
The final occurrence of purplish red sandstone and gray-white micro-clastic rocks are the mark of the top boundary of the Batang Gr. Regionally, the next younger unit may be the Qoimaco Fm (base of Yanshiping Gr) of Middle Jurassic?
Regional extent
The Batang Group is distributed in the Yushu area of southern Qinghai and the northeastern margin of Tanggula Mountain.
GeoJSON
Fossils
The group contains fossils including ammonoids, bivalves, brachiopods, gastropods, and corals. Bivalve Halobia sp., H. pluriradiata, H. convexa, H. styriaca in the first rock group; The Second Formation of Ammonoid Protrachyceras sp., Trachyceras sp., Pseudosirenites sp., Cladiscites sp.; Bivalves Halobia bagingensis, Pergamidia sp., P. eumenea; Bivalves Halobia sp., H. talauana, H. yandongensis, H. superbescens in the fourth group; Ammonoid Arcestes sp.; Bivalves Krumbeckiella sp., Cardium sp., Plagiostoma sp.
Age
Additional Information