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

Kabaw Fm

Period: 
Cretaceous, Paleogene

Age Interval: 
Late Cretaceous-Early Paleocene


Province: 
Myanmar Central Basins

Type Locality and Naming

Chindwin Basin, in Minbu-Salin Basin, Saw-Tilin 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

Continental marl. Predominantly argillaceous series consisting of bluish grey to grey, brown, greyish brown, locally carbonaceous and ferruginous sandy shales and clays with nodular calcareous sandstone concretions. Thin sandstones and conglomerate are present in the middle and top. In the Sittwe district, light cream-colored argillaceous limestones, homogenous in textured, occasionally seamed with calcite and having conchoidal fracture outcrop in several places. The limestones are often associated with greyish, rather argillaceous sandstones. The sandstones are sometimes pisolitic, and with small pea-sized globular concretions of lime and iron, which on weathering, leaves-holes in the sandstones, giving them an amygdaloidal appearance (after Than N.M. 2013). In Minbu-Salin Basin and Pyay Embayment, it is claystone. This Fm consists mainly of shale, intercalated with occasional fine-grained turbiditic sandstones. Measured sediment thickness is 716–1308 m (2300–4200 ft) in the Saw-Tilin area, with sand 10% and shale 90%.

[Figure: Stratigraphic succession of the Chindwin Basin (after Than Htut, 2017)]


Lithology Pattern: 
Continental marl


Relationships and Distribution

Lower contact

Unconformable with Orbitolina Limestone Fm

Upper contact

Unconformable with Paunggyi Fm

Regional extent

This Fm is developed in Chindwin Basin, Minbu-Salin Basin. Especially in the eastern foothills of the Chin State and in the Sittwe district.

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


GeoJSON

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Fossils


Age 

Late Cretaceous-Early Paleocene. [Note: Schematic strat section in the ONGC Publ. 44 indicates spans much of Paleogene, because it is indicated as conformably overlain by the Paunggyi Conglomerates.

Age Span: 

    Beginning stage: 
Maastrichtian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
72.17

    Ending stage: 
Selandian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
59.24

Depositional setting

Pro-delta environment in Chindwin Basin. Deposited under outer neritic condition in a flysch type of environment in Minbu-Salin Basin and Pyay Embayment.


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)