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Padaung Formation
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Padaung Fm base reconstruction

Padaung Fm

Period: 
Paleogene

Age Interval: 
Middle Oligocene


Province: 
Myanmar Central Basins

Type Locality and Naming

Minbu-Salin Basin, Padaung Chaung area. [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. Shales are greenish-grey to dark grey, moderately hard, laminated to nodular and carbonaceous. Fossiliferous marl beds and fine-grained thinly bedded sandstone beds are recorded in the middle part of this Fm. A thickness of c. 1246 m (4000 ft) was recorded in the Padaung Chaung area, with sand 20% and shale 80%.


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

Conformable with Shwezetaw Fm

Upper contact

Conformable with Okhmintaung Fm

Regional extent

This Fm is developed in Minbu-Salin basin, Pyay embayment.

[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

Contains the fossils Globorotaliaopima, Globorotalia ciperoensis, Operculina complanata, Nummulites fichteli, N. intermedius and Lepidocyclina (Eulepidina) elephantina.


Age 

Middle Oligocene

Age Span: 

    Beginning stage: 
Rupelian

    Fraction up in beginning stage: 
0.7

    Beginning date (Ma): 
29.27

    Ending stage: 
Chattian

    Fraction up in the ending stage: 
0.3

    Ending date (Ma):  
26.01

Depositional setting

This Fm is deposited in neritic to estuarine environments.


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)