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Peide Formation
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Peide Fm base reconstruction

Peide Fm

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, (21)


Province: 
Heilongjiang

Type Locality and Naming

E. Heilongjiang – Wandashan. Lowest formation of Longwangzhang Gr. Named after Peide Township, Mishan County, Heilongjiang Province, by Ju Ranhong, Zheng Shaolin, Yu Xihan, et al., 1981, Geological Review, 27(5): 391–401. First appeared in a 1976 manuscript by No.108 Heilongjiang Coal Field Geology Team.


Lithology and Thickness

"In general, a volcanic sedimentary formation with some coal intercalations. Lower part of the formation is composed mainly of conglomerates and granule-bearing sandstone. In the middle part, sandstone, mudstone, carbonaceous mudstone and coal (3 mineable seams) with thin-bedded tuff yield abundant plant fossils. Upper part consists of yellow-green andesite, tuff, tuff breccia, siltstone and black mudstone. The mudstone beds occasionally contain some freshwater gastropods. This forrnation is about 520 m in thickness."


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

It overlies the base rocks or the Yangshugang Fm unconformably. "This group unconformably overlies the Permian System containing the plant fossil such as Noegerathiopsis, Calamites, Comia, Zamiopteris and others, or lies on Paleozolc granites."

Upper contact

Conformably underlies the Qihulin Fm.

Regional extent


GeoJSON

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Fossils

It contains only plant fossils in the middle part: Equistetum ushimarensis,, Todites williamsoni, Conipteris hymenphylloids, Cladophlebis nebbensis, Nilssonia compta, Ginko digitata, Pityophyllum lindstroemi, Podozamits lancelolatus, and others.


Age 

Constrained by Barremian-age of overlying Qihulin Fm.

Age Span: 

    Beginning stage: 
Hauterivian

    Fraction up in beginning stage: 
0.7

    Beginning date (Ma): 
128.33

    Ending stage: 
Barremian

    Fraction up in the ending stage: 
0.6

    Ending date (Ma):  
123.44

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Descriptions copied from Futakami, M., et al. (1995) "Barremian ammonites from the Longzhaogou Group in eastern Heilongjiang, northeast China", Jour. Geol. Soc. Japan, 101: 79-85. Age span from D.P. Xi, X.Q. Wan et al. (2019; Cretaceous chapter of China Integrated Stratigraphy and Timescale).