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

Orbitolina Limestone Fm

Period: 
Cretaceous

Age Interval: 
Late Cretaceous


Province: 
Myanmar Central Basins

Type Locality and Naming

Chindwin Basin, Minbu-Salin Basin. [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

No details; but obviously benthic-foram-rich limestone.

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


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

This is the oldest unit in Chindwin Basin.

Upper contact

Conformable with Kabaw Fm in Chindwin Basin, Conformable with Paung Chaung Fm in Minbu-Salin Basin.

Regional extent

This Fm is developed in Chindwin Basin, Minbu-Salin Basin.

[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


Age 

Late Cretaceous

Age Span: 

    Beginning stage: 
Cenomanian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
100.50

    Ending stage: 
Cenomanian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
93.90

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Than Htut, (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)