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

Zigyaing Fm

Period: 
Paleogene

Age Interval: 
Early Eocene


Province: 
Myanmar Central Basins

Type Locality and Naming

Irrawaddy River Delta, type locality Zigyaing village (16° 01′ N, 94° 12′ E). [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

Sandstone. consists mainly of sandstones, light grey to grey, hard to very hard, well bedded, fine to coarse grained, poorly sorted, sub-angular to subrounded, intercalated with conglomerate lenses at the base,with well-bedded volcanic tuff beds and subordinate amounts of dark brown shale. The shale beds are ash-grey to dark brown, hard, laminated, carbonaceous; coal seams are intercalated with the shale beds and in the upper part pillow lavas are associated with slump structures. It is of thickness 1097 m (93 600 ft).


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

Conformably overlies Kwingu Fm

Upper contact

Unconformable with Mawdin Fm

Regional extent

It is developed in Irrawaddy River Delta.

[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 

Early Eocene

Age Span: 

    Beginning stage: 
Ypresian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
56.00

    Ending stage: 
Ypresian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
52.04

Depositional setting


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)