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Pyawbwe Formation
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Pyawbwe Fm base reconstruction

Pyawbwe Fm

Period: 
Neogene

Age Interval: 
Early Miocene


Province: 
Myanmar Central Basins

Type Locality and Naming

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

Synonym: Pyawbwe Sandstones

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


Lithology and Thickness

Sandy claystone. Shales are olive-grey to dark grey, soft, laminated to nodular, micaceous and slightly carbonaceous and gypsiferous. Quartz pebbles are very common in the shale beds. Sandstones are light grey, moderately hard, bedded and fine- to medium grained. The thickness of the Lower Miocene Pyawbwe Fm (Aquitanian) at Pyawbwe village, Minbu Township was measured as c. 2024 m (6500 ft) with sand 30% and shale 70%.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

Unconformable with Okhmintaung Fm

Upper contact

Conformable with Kyaukkok 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

Megafossil fragments are recorded at the base of the beds. Lamellibranch and gastropod shell fossils are recorded in the marl lenses.


Age 

Early Miocene

Age Span: 

    Beginning stage: 
Aquitanian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
23.04

    Ending stage: 
Burdigalian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
15.99

Depositional setting

This Fm was deposited in estuarine to outer neritic 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)