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

Tanshauk Mbr Fm

Period: 
Ordovician

Age Interval: 
Late Ordovician


Province: 
Myanmar Shan Region

Type Locality and Naming

Shan South Plateau, the Tanshauk Mbr is named after Tanshauk village, Ye-ngan township (Myint Lwin Thein 1973), where it crops out in the type section (128 m thick) along the narrow cart road 900 m SW of Linwe village, Ye-ngan township. It is also exposed near Kyauktaw, Pegin, Linwe, Nan-on, Tanshauk and Kyauknget villages. [Original Publication: Barber, A. J., Khin Zaw & Crow, M. J. (eds) 2017. Myanmar: Geology, Resources and Tectonics. Geological Society, London, Memoirs, 48, 317-342]


Lithology and Thickness

Siltstone. The unit consists of thin- to medium-bedded, purple, pink, soft, laminated, siltstone, calcareous shale and mudstone.


Lithology Pattern: 
Siltstone


Relationships and Distribution

Lower contact

Conformable with Nan-On Fm

Upper contact

Conformable with Linwe Fm (formerly Wabya Fm)

Regional extent

The Tanshauk Mbr Fm might be correlated with the Hwe Mawng Purple Shale of Shan State North (Myint Lwin Thein 1973).


GeoJSON

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Fossils

Students of Dagon University identified a fauna from the Tanshauk Mbr from the Linwe area, Shan State South, including: brachiopods, Saucrorthis sp., Pentameridae indet., Glyptambonites sp., Lepidocyclus sp. and Platystrophia sp.; and trilobites Ectillaenus sp. and Asaphinae indet.


Age 

Late Ordovician. Most of those genera are confined to the Katian.[Figure: Stratigraphical correlation of the Cambrian–Devonian rocks of Myanmar Shan region with those of northern Thailand and NW Malaysia. Asterisks indicate the levels at which fossils useful in correlation were found (after Aung&Cocks, 2017)]

Age Span: 

    Beginning stage: 
Katian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
452.75

    Ending stage: 
Katian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
445.21

Depositional setting

Shallow-marine environment.


Depositional pattern:  


Additional Information


Compiler:  

Aye Ko Aung and L. Robin M. Cocks (Aung & Cocks, Cambrian–Devonian stratigraphy of the Shan Plateau, Myanmar (Burma), Chapter 14 in Barber, A. J., Khin Zaw & Crow, M. J. (eds) 2017. Myanmar: Geology, Resources and Tectonics. Geological Society, London, Memoirs, 48, 317-342).