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Liangjiehe Formation
Click to display on map of the Ancient World at:
Liangjiehe Fm base reconstruction

Liangjiehe Fm

Period: 
Neoproterozoic

Age Interval: 
Early Nanhuan (latest Tonian); Nh (52)


Province: 
Guizhou

Type Locality and Naming

Northeast corner of Guizhou border with Hunan. The Liangjiehe Fm was named by the No. 108 Team of Guizhou Bureau of Geology in 1960 and formally published in 1975 (Geology and Mineral Research, 1975 supplement). The typical section is situated in the Liangjie River valley in Songtao County, Guizhou Province.

Synonym: （两界河组）


Lithology and Thickness

The definition of the Liangjiehe Fm has been revised as representing a suite of medium- to coarse-grained marine clastic deposits. The Liangjiehe Formation is dominantly composed of greenish gray and gray greywacke, feldspathic litharenite and conglomerate. The basal part is light grayish green silty conglomerate and dolomitic conglomerate, occasionally bearing dolomite. The thickness of the Liangjiehe Formation varies from several meters to 390 m.


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

It rests unconformably or disconformably on the Xiajiang Gr (Fanzhao Fm) in West Fanjing Mtn. (northeast corner of Guizhou border with Hunan), or the Banxi Gr (Longli Fm) in East Fanjing Mtn (Hunan side of border).

Upper contact

It is disconformably overlain by the Tiesi'ao Fm. However, the schematic stratigraphic column of this NE Guizhou region (columns 52, 53) indicate that it is overlain by the widespread Gucheng Fm of early Cryogenian.

Regional extent

Northeast corner of Guizhou; West Fanjiang Mtn. With a variable lithology and thickness, this formation is mainly distributed around Songtao and Yinjiang counties. Its upper part in Yanglizhang and Dawu of Songtao County has an increasing pelitic component and bears tuffaceous beds.


GeoJSON

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Fossils


Age 

Early Nanhuan (latest Tonian) on schematic stratigraphic section.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.8

    Beginning date (Ma): 
776.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
720.00

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Extracts from The Neoproterozoic Erathem (chapter in Stratigraphic Lexicon of China, draft of 2022) by Gao Linzhi, Ding Xiaozhong, Zhang Chuanheng, Zhang Heng.