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Kyaukkok Formation
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Kyaukkok Fm base reconstruction

Kyaukkok Fm

Period: 
Neogene

Age Interval: 
Middle Miocene


Province: 
Myanmar Central Basins

Type Locality and Naming

Minbu-Salin Basin, Kyaukkok village area 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]

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


Lithology and Thickness

Sandy claystone. This Fm is composed mainly of sandstones, interbedded with brown shale beds. The sandstones are light grey to olive-grey, hard, bedded to thickly bedded, medium- to coarse-grained, fairly well-sorted, composed of quartz, feldspar, mica and lithic clasts set in a silty matrix. Mudstones are greenish-grey to olive-grey, soft, laminated, micaceous, carbonaceous and fossiliferous. A thickness of c. 1200 m (4000 ft) was recorded in the Kyaukkok village area in Minbu Township, with sand 70% and shale 30%. In Pyay Embayment, thickness ranges from 390 to 1250 m.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

Conformable with Pyawbwe Fm

Upper contact

Conformable with Obogon 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 microfossils Globorotalia fohsi barisanensis, G. peropheronda, Globigerinoides sicanus, Orbulina universa and Ammonia koeboensis.


Age 

Middle Miocene

Age Span: 

    Beginning stage: 
Langhian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
15.99

    Ending stage: 
Serravallian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
11.63

Depositional setting

This Fm was deposited under lagoonal to upper shoreface 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)