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Majiatun Formation
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Majiatun Fm base reconstruction

Majiatun Fm

Period: 
Neoproterozoic

Age Interval: 
Sinian (Ediacaran), Z 25）


Province: 
Liaoning

Type Locality and Naming

Southern peninsula of Liaoning. The name Majiatun Fm derived from the Majiatun stage named by Matsushita in 1931. The typical section is situated in south mountain of Majiatun in Jinxian County, Liaoning Province.

Synonym: （马家屯组）


Lithology and Thickness

Lower part is composed of gray, grayish yellow thin-bedded micritic limestone and stromatolitic limestone. Upper part is gray, greenish gray calcareous shale intercalated with thin-bedded micritic limestone. The total thickness is 113 to 179 m.

[Figure: Geomorphological Model of Majiatun Fm]


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

The basal part is grayish yellow stromatolite-bearing limestone, which rests conformably on the Shisanlitai Fm.

Upper contact

Conformably overlain by the Cuijiatun Fm.

Regional extent

Southern peninsula of Liaoning. With a persistent lithology, it is mainly distributed in Jinxian, Dalian area and fragmentally in Fuzhou area in Liaodong Peninsula.


GeoJSON

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Fossils

The Majiatun Formation yields stromatolites Gymnosolen cf. ramsayi, G. furtus, G. leuis, Katauia karatauia, K. xiwafangensis, Jurusania asymmetrica, etc. Microplants Trachysphaeridium simplex, T. rude, T. rugosum, T. planum, Leiopsophosphaera apertus, L.minor, Asperatopsophos pheara off. bavlensesis, Dietyosphaera macroreticulata, etc.


Age 

Upper-middle (6 of 8) in a succession of eight formations spanning early through middle Sinian (early through middle Ediacaran) formations according to assigned "Z" code and schematic stratigraphic column.

Age Span: 

    Beginning stage: 
Ediacaran

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
586.90

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
0.6

    Ending date (Ma):  
577.28

Depositional setting

Besides locally bearing scour marks and desiccation, it has wavy bedded and is interpreted as shelf and slope facies.


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.