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

Natma Fm

Period: 
Neogene

Age Interval: 
Early-Middle Miocene


Province: 
Myanmar Central Basins

Type Locality and Naming

Chindwin Basin, [Original Publication: Barber, A. J., Khin Zaw & Crow, M. J. (eds) 2017. Myanmar: Geology, Resources and Tectonics. Geological Society, London, Memoirs, 48, 219–260]

[Figure: Map showing location of sub-basins of the Central Myanmar Basin (after Myint Thein and M. Maung 2017)]


Lithology and Thickness

Claystone. Natma Fm consists mainly of mottled blue-grey, yellow, reddish-brown, clays, soft, silty, massive and nodular.

[Figure: Stratigraphic succession of the Chindwin Basin (after Than Htut, 2017)]


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

Conformable with Latkhat Fm

Upper contact

Conformable with Shwethamin Fm

Regional extent

This formation is developed in Chindwin Basin.

[Figure: a) Composite stratigraphic correlation of Myanmar Central Basins (after Than et al., 2017)]


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[97.36,26.84],[95.62,26.11],[94.83,24.64],[94.19,22.39],[94.3,20.38],[95.11,17.51],[96.41,17.81],[95.95,20.52],[95.51,22.18],[96.28,24.52],[96.96,24.26],[97.82,25.42],[97.36,26.84]]]]}}

Fossils


Age 

Early-Middle Miocene

Age Span: 

    Beginning stage: 
Burdigalian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
20.45

    Ending stage: 
Serravallian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
12.72

Depositional setting

Under lacustrine conditions.


Depositional pattern:  


Additional Information


Compiler:  

Than Htut, Kapesa Lokho, D.S.N.Raju and Ravi Misra (Than Htut, Myanmar petroleum systems, including the offshore area, Chapter 11 in Barber, A. J., Khin Zaw & Crow, M. J. (eds) 2017. Myanmar: Geology, Resources and Tectonics. Geological Society, London, Memoirs, 48, 219–260)