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

Kori Fm

Period: 
Cretaceous

Age Interval: 
Coniacian to Maastrichtian (Late Cretaceous)


Province: 
W.India Kutch Basin

Type Locality and Naming

Offshore (local): Interval 2350 to 4511 m (sub K.B.) in wells K1-1A (Zutshi et al., 1993)

[Fig. Geological and structural map of Kutch, also showing the onshore and offshore wells drilled for oil exploration. (Map by Rasoul Sorkhabi in GeoExpro Dec2014, based on various sources including S.K. Biswas, Current Science, 25May2005)]


Lithology and Thickness

Limestone (2 km thick!): Consists of mudstone/wackestone, fossiliferous limestone with shaly lamina with argillaceous partings. Calcareous sandstone and claystone bands are present at places, partial dolomitization has been observed. 2164 m thick in KI-1A and 2357 m in KD-1


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

Lower contact is not known

Upper contact

Disconformable with Deccan Traps Fm in KD-1. This formation is unconformably overlain by the Nora Member of the Nakhtarana Fm in the KI area.

Regional extent


GeoJSON

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Fossils

Globotruncana schneegansi, Globotruncana concava, Globotruncana angusticarinata- Globotruncana subcircumnodifer, G. calcarata-G. bullodies, and Rosita contousa-Rosita fornicate


Age 

Coniacian to Maastrichtian (Upper Cretaceous)

Age Span: 

    Beginning stage: 
Campanian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
83.65

    Ending stage: 
Maastrichtian

    Fraction up in the ending stage: 
0.8

    Ending date (Ma):  
67.27

Depositional setting

Middle to outer shelf


Depositional pattern:  


Additional Information


Compiler:  

Modified from Jitendriya Mishra (2009) Kutch-Saurasthra Basin, Chap. 17 in ONGC Bull 44