Xialiangzi Fm
Type Locality and Naming
The type section is the well M75-31 section located at the Xialiangzi Village in Jidong County, Heilongjiang Province. It was named and surveyed by Qu Guansheng and Hu Junsheng in 1984.
Synonym: Guan Qusheng et al. (1997) thought the Xialiangzi Fm is synonymous (coeval) with Fujin Fm.
Lithology and Thickness
It is characterized by the grey, greyish-green, and greyish-white sandy conglomerates, sandstones, and mudstones, intercalated with basalt or brown coal layers partly. The thickness is 240 m in the type section and the thickness overground varies from 18 m to 176 m in the district (the formation is mainly buried underground).
Relationships and Distribution
Lower contact
The Xialiangzi Fm is in faulted or unconformable contact with the underlying Hulin Fm (Fuhulin Fm) or Mesoproterozoic Longjiang Gr.
Upper contact
The Xialiangzi Fm is in unconformable contact with the overlying Quaternary deposits or Neogene Ningan Basalt Fm.
Regional extent
The formation is distributed in the Xingkai Lake plain, which is northeast of Jidong County and Mishan County in Heilongjiang Province.
GeoJSON
Fossils
Sporopollens of angiosperm are dominant, including Juglanspollenites, Faguspollenites, and Quercoidites. Sporopollens of gymnosperm are lesser, including Pinuspollenites and Tsugaepollenites. Sporopollens of ferns are rare, including Sphagnumsporites and Osmundacaulis. Fossil plants are also found in this formation.
Age
Depositional setting
Fluvio-lacustrine clastic deposits.
Additional Information