Laohutai Fm
Type Locality and Naming
The naming section is located on the north slope of Nanshan Mountain, Laohutai shaft field, Fushun coalfield, Liaoning. Named by Hong Youchong in 1974.
Lithology and Thickness
Mainly grayish black pyroxene basalt, intercalated with 1–4 coal beds and several beds of grayish green, brown and grayish black shale, fine sandstone and tuff. Its thickness is 56–500 m.
Relationships and Distribution
Lower contact
The formation has an unconformable contact with the underlying Lower Cretaceous Xiaoling Fm or Archean Anshan Gr.
Upper contact
The formation has a disconformable contact with the overlying Lizigou Fm.
Regional extent
It is chiefly distributed in the Fushun area, Liaoning.
GeoJSON
Fossils
According to the studies of sporopollen carried out by Song Zhichen et al. and Sun Xiangjun et al. respectively, the pollen of angiosperms makes up 80–86% of the assemblage, which is characterized by the dominance of triporate forms and rare tricopote and tricolporate forms, with Betulaepollenitus and Paraalnipollenites predominating. Gymnosperms are dominated by pollen of Taxodiaceae with less spores of pteridophytes.
This assemblage is very similar to the Paleogene sporopollen assemblage in the Zeyskaya-Bureya Lowland of the Far East Region of the former Soviet Union, the Yukon Territory of Canada and many areas of the circum-Pacific region in the northern hemisphere.
Age
Depositional setting
Additional Information