Wunur Fm
Type Locality and Naming
The type section is located at 8 km place, north of Wunur in Daxinganling, Heilongjiang.
It was named by Ning Qisheng et al. in 1959.
Lithology and Thickness
Limestone. The formation is dominated by bioclastic sparite and micrite limestone, intercalated with thin-bedded calcareous siltstone. The outcropping thickness is 178 m.
Relationships and Distribution
Lower contact
The base is in conformable contact on the underlying Luotuoshan Fm of grayish-black massive sparite limestone with abundant corals and yellowish-green phyllitized slate. Their lithology boundary is easy to differentiate.
Upper contact
The overlying Beikuang Fm with its the basal slate and siltstone and some breccia makes it easily to differentiate from the underlying sparry limestone of the Wunur Fm.
Regional extent
The formation is distributed in the Wunur and Zhadunhe River area, Heilongjiang, in an east-north direction strike with sporadic distribution over an area of about 22 km2.
GeoJSON
Fossils
Fossils are abundant, and Tetracoralla and Tabulata are most developed, mainly Dictyofavosites microporosus, Pachyfavosites vilvaensis, Stelliporella? cf. ataiformis, Favosites goldfussi, Amplexiphyllum sp., Lyrielasma sp., Tryplasma sp. Part of the formation is a bedded reef.
Age
Depositional setting
Part of the formation is a bedded reef.
Additional Information