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Maihanhada Formation
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Maihanhada Fm base reconstruction

Maihanhada Fm


Period: 
Permian

Age Interval: 
P (10), early-Middle Permian


Province: 
Inner Mongolia

Type Locality and Naming

The type section is located at Maihanhada of the Yibur County, Alashan Left Banner, Inner Mongolia (102°56′E, 41°44′N). It was named by Zheng Zhaochang et al. in 1979.


Lithology and Thickness

Clastics. Composed essentially of clastic rocks, intercalated with bioclastic limestone. Lower part consists of grey conglomerate, variegated pebble-bearing sandstone and calcareous sandstone, intercalated occasionally with thin-bedded limestone, siliceous limestone and bioclastic limestone. Upper part consists of dark-grey greywacke quartz-sandstone and siltstone, yielding brachiopods, corals, trilobites and bivalves. Thickness is about 1240 m. The limestone and conglomerate layers are increasing in amount from W to E, with their thickness getting a bit greater.


Lithology Pattern: 
Sandy limestone


Relationships and Distribution

Lower contact

Unconformable contact with the sandstone of the underlying Lower Carboniferous Series; but regionally the next older unit (on Lexicon chart) is the Suhaxibi Fm limestone

Upper contact

Conformable contact with the overlying Aqide Fm

Regional extent

Distributed in the Wuhaxibi-Maihanhada-Wulanbaixing-Hangwula alignment on the northern margin of the Alashan Massif, with its exposures being found also on the southern margin of the Badanjilin Desert.


GeoJSON

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Fossils

Brachiopods and coral fossils in the lower part are the Spiriferella-Neospirifer-Kochiproductus-Yakovlevia-Tachylasma assemblage, while those in its upper part yields are the Paramarginifera-Marginifera-Muirwoodia-Verbeekiella assemblage.


Age 

Early Middle Permian

Age Span: 

    Beginning stage: 
Kungurian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
283.30

    Ending stage: 
Kungurian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
278.84

Depositional setting

It is interpreted as a shallow-sea facies deposit.


Depositional pattern:  


Additional Information


Compiler:  

Li Li