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

MyanmarAlluvium Fm

Period: 
Pliocene

Age Interval: 
Late Pliocene


Province: 
Myanmar Central Basins

Type Locality and Naming

Pegu (Bago) Yoma-Sittaung Basin, Alluvium with no official name, but "Fm" added here for database-linking purposes. [Original Publication: Barber, A. J., Khin Zaw & Crow, M. J. (eds) 2017. Myanmar: Geology, Resources and Tectonics. Geological Society, London, Memoirs, 48, 169-183]

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


Lithology and Thickness

Alluvium deposits.


Lithology Pattern: 
Conglomerate


Relationships and Distribution

Lower contact

Unconformable with Irrawaddy Fm

Upper contact

Youngest unit in the Pegu (Bago) Yoma-Sittaung Basin (BYSB)

Regional extent

This Fm is developed in Pegu (Bago) Yoma-Sittaung Basin (BYSB), Chindwin Basin, Minbu-Salin Basin, Pyay Embayment and Irrawaddy Delta.

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

[Figure: b) Stratigraphic correlation of Bago (Pegu) Yoma-Sittaung Basin (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

No report of fossils.


Age 

Late Pliocene

Age Span: 

    Beginning stage: 
Piacenzian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
3.09

    Ending stage: 
Piacenzian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
2.58

Depositional setting

The Quaternary deposits blanket the older formations and were formed mostly in fluvial environments, locally forming alluvial fans (Myint Thein 2002, 2011).


Depositional pattern:  


Additional Information


Compiler:  

Myint Thein and Maung Maung (Myint Thein and Maung Maung The Eastern (Back-arc) Basin of Central Myanmar: Basement rocks, lithostratigraphic units, palaeocurrents, provenance and developmental history, Chapter 8 in Barber, A. J., Khin Zaw & Crow, M. J. (eds) 2017. Myanmar: Geology, Resources and Tectonics. Geological Society, London, Memoirs, 48, 169-183)