Beixing Fm
Type Locality and Naming
The type section is in Qiligashan (Mt.), Mishan Mt., Heilongjiang. It was named by Qu Guansheng et al. in 1975.
Lithology and Thickness
Volcanic tuff. Lower part is dominated by yellow-brown dacitic tuff, intercalated with dacitic tuffite, thin-bedded rhyolitic tuff. Upper part consists of yellow-brown fine-grained dacitic tuff intercalated with dark-gray tuffaceous slate and gray medium−fine greywacke. Total thickness is over 215 m. The thickness increases from north to south (148.6− 215.4 m).
Relationships and Distribution
Lower contact
Conformable contact with the underlying Late Devonian Qiligashan Fm at Lanhuadingzi of Baoqing.
Upper contact
Regionally, with some overlap, the next younger unit is the Cuiganglinchang Fm chert and limestone.
Regional extent
In the areas east of Laotudingzi−Taiping Road and west of Xiaochengzi Township of Baoqing County, this formation is composed of continental intermediate volcanic rock, and sandstone and slate, with the thickness exceeding 148.6 m.
GeoJSON
Fossils
Upper part contains Brachiopods Pseudosyrinx mishanensis, P. cf. plenoides, Chonetes missouriensis, Martiniella sp., Torynifer pseudolineatus, Hemiplethorynchus cf. Fallax, H. pseudofallax and H. gilikasanensis, as well as bivalves and gastropods,
Age
Depositional setting
It is interpreted as continental volcanic eruptive sediments.
Additional Information