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Naungkangyi Gr
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Naungkangyi Gr base reconstruction

Naungkangyi Gr

Period: 
Ordovician, Silurian

Age Interval: 
Early Ordovician-Early Silurian


Province: 
Myanmar Shan Region

Type Locality and Naming

Shan North Plateau, Shan mid-Plateau (Pyin Oo Lwin), area between Mandalay and Pyin Oo Lwin. named after Naung Kangyi village, situated just north of Pyin Oo Lwin. It was originally named the Naung Kangyi Series of La Touche (1913), who divided it into Lower and Upper Stages. [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. Graptolite shale with shelly bed. According to La Touche (1913) the Ordovician System is the second-most widely distributed rock group after the Plateau Limestone Gr in the Shan State. The Sitha Fm, the Lokepyin Fm and the Kunlein Fm of Pyin Oo Lwin township (Aye Ko Aung 2012) are described here.


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

Conformable with Panghsapye Fm / Kunlein Fm in Shan North Plateau, Conformable with Kunlein Fm in Shan mid-Plateau (Pyin Oo Lwin).

Upper contact

Conformable with Sitha Fm / Lokepyin Fm in Shan North Plateau and Shan mid-Plateau (Pyin Oo Lwin).

Regional extent

This Gr is developed in North, Mid parts of Shan Plateau.


GeoJSON

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Fossils

The small brachiopods, new species of straight-coned nautiloids.


Age 

Early Ordovician-Early Silurian[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: 
Rhuddanian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
443.07

    Ending stage: 
Floian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
471.26

Depositional setting

Shallow supratidal, intertidal and partly subtidal environments.


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).