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Natteik Limestone Formation
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Natteik Limestone Fm base reconstruction

Natteik Limestone Fm

Period: 
Triassic

Age Interval: 
Middle–Late Triassic


Province: 
Myanmar Shan Region

Type Locality and Naming

Shan South Plateau, [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

Limestone. The dark-coloured, well-bedded cherty limestone of turbidite facies with an ammonite–thin bivalve–radiolarian association, the well-bedded intraclastic limestone turbidites facies and the massive coral–sponge–algal reef limestone facies that occupy the highest stratigraphic position above the Nwabangyi Fm, can be mapped as the Natteik Fm. It is known from the present study of Amos (1975) that the Natteik Fm may comprise at least three distinct limestone facies or members: the dark grey cherty turbidite limestone facies (represented by the Cherty Limestone Unit Fm); the intraclastic limestone turbidite facies; and massive coral-sponge-algal reef limestone facies (constituting the Reefal Limestone Unit Fm of the present account).


Lithology Pattern: 
Siliceous limestone


Relationships and Distribution

Lower contact

Conformable with Thitsipin Limestone Fm

Upper contact

Conformable with Alluvium

Regional extent

This Fm is developed in Shan South Plateau. Coeval with Cherty Limestone Unit Fm in mid-Plateau. Particularly the Natteik Fm, may be correlated with the Chaiburi Fm of the Phatthalung area of Peninsular Thailand.


GeoJSON

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Fossils

The ammonites identified are Ptychites cf. cochleatus, P. cf. asura, Ceratites (Paraceratites) cf. thuillieri, C. (P.) cf. himalianus, Danubites sp. and Protrachyceras sp. (Zaw Win 1991; Ohnmar Soe Yin 2010).


Age 

On the basis of the ammonites this unit can be assigned to the Middle Triassic (Anisian), and may range up possibly to the Late Triassic (Carnian) (Zaw Win 1991; Ohnmar Soe Yin 2010).[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: 
Anisian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
246.70

    Ending stage: 
Carnian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
227.30

Depositional setting

Deposited from waning turbidity currents, in a deeper basinal realm during Middle and Late Triassic times.


Depositional pattern:  


Additional Information


Compiler:  

Zaw Win, Kyi Kyi Shwe & Ohnmar Soe Yin (Zaw Win, Kyi Kyi Shwe & Ohnmar Soe Yin, Sedimentary facies and biotic associations in the Permian–Triassic limestones on the Shan Plateau, Myanmar, Chapter 15 in Barber, A. J., Khin Zaw & Crow, M. J. (eds) 2017. Myanmar: Geology, Resources and Tectonics. Geological Society, London, Memoirs, 48, 317-342).