Huanghua Fm
Type Locality and Naming
The naming section is located in the well of exploratory profile No. 18 of the Huanghua clay mine, Mudanjiang, Heilongjiang. Named by Yang Yueyu et al. in 1976 and published in the “Regional Stratigraphic Table of Heilongjiang Province” in 1979.
Lithology and Thickness
Lower part, sandy conglomerate and grit with mudstone; middle part, fine sandstone, siltstone and mudstone with oil shale, lignite and several basalt layers, yielding the plant Betulla, Alnus, etc. and sporopollen. Upper part, pebbly sandstone with muddy sandstone and sandy mudstone. The thickness is 206–276 m.
Relationships and Distribution
Lower contact
It unconformably overlies the Cretaceous Longjing Fm.
Upper contact
[Not given; but implied as below the Sunwu Fm in China Lexicon strat chart; however, that conflicts with its occurrence in "southeastern Heilongjiang"]
Regional extent
It is mainly distributed at Huanghua of Maodanjiang, Wuxing Township of Linkou County and Pingyang Township of Jidong County in southeastern Heilongjiang.
GeoJSON
Fossils
It has the plant Betulla, Alnus, etc. and sporopollen (middle part)
Age
Depositional setting
The formation belongs to a sequence of lacustrine-swampy clastic, coal-bearing deposits formed in the wet-hot climatic environment, intercalated with basic volcanic rocks.
Additional Information