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

Shwetaung Clay Fm

Period: 
Neogene

Age Interval: 
early Early Miocene


Province: 
Myanmar Central Basins

Type Locality and Naming

Pegu (Bago) Yoma-Sittaung Basin, SW of Mandalay. [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

Claystone. More than 300 m thick and exposed in a clay diapir 50 km SW of Mandalay. It is composed of bluish to greenish grey clays and some silty sandstones.


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

It is the oldest unit of Pegu (Bago) Yoma-Sittaung Basin (BYSB)

Upper contact

Conformable with Taungtalone Sandstone Fm

Regional extent

This Fm is developed in Pegu (Bago) Yoma-Sittaung Basin.

[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

Cruziana ichnofossils.

[Figure: (a) Cruziana sp. at 306/2 mile post, east side of Yangon–Mandalay Expressway (after Myint Thein and M. Maung 2017)]


Age 

early Early Miocene (Robinson et al. 2014).

Age Span: 

    Beginning stage: 
Aquitanian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
23.04

    Ending stage: 
Aquitanian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
20.45

Depositional setting

Shallow-marine and freshwater environments.


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)