Nwabangyi Dolomite Fm
Period:
Triassic
Age Interval:
Middle–Late Triassic
Province:
Myanmar Shan Region
Type Locality and Naming
Shan North Plateau, Paunglaung–Mawchi Belt. [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
Dolomite. Shattered dolomite and dolomitic limestone.
Lithology Pattern:
Dolomite
Relationships and Distribution
Lower contact
Conformable with Thitsipin Limestone Fm
Upper contact
Conformable with TurbuditesandMudstones Fm
Regional extent
This Fm is developed in Shan North Plateau. For the sake of convenience in this description, we consider here that the Dolomitic Limestone Unit Fm is equivalent to the combined Thitsipin and Nwabangyi Fms, Amos (1975).
GeoJSON
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Fossils
Contains a peculiar miliolid–smaller foraminifer association of Shanita–Hemigordiopsis fauna.
Age
this unit can be assigned to the Middle Triassic (Anisian), and may range up possibly to the Late Triassic (Carnian). In ENE, late-Middle through Late Permian.[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
Shallow carbonate shelf
Depositional pattern:
Additional Information
Compiler:
A. J. Barber, Khin Zaw and M. J. Crow (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).