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Goradongar Formation
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Goradongar Fm base reconstruction

Goradongar Fm

Period: 
Jurassic

Age Interval: 
middle Jurassic


Province: 
W.India Kutch Basin

Type Locality and Naming

Local: Goradongar range, section along south-eastern flank of Modar Hill Dome, Pacham Island (Biswas, 1977)

[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

Sandstone to limestone. Massive sandstone, grey gypsiferous shale, flag stone, ferruginous shale, limestone with chert nodules; golden oolitic limestone towards the base. It has been divided into three units, upper, middle and lower, with flagstone appearing in the middle unit. In the type area, it is 150 m thick; in offshore well GK-29A-1 it is 300+ m thick


Lithology Pattern: 
Sandy limestone


Relationships and Distribution

Lower contact

Unconformable, the next older regional unit is either the Kaladungar Fm or the Lodai Fm

Upper contact

Not exposed, but next younger regional unit is the Jumara Fm

Regional extent


GeoJSON

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Fossils

Ammonites, Brachiopods, Corals, Corbula sp., Gerville sp., Trigonia sp.


Age 

Callovian (Middle Jurassic)

Age Span: 

    Beginning stage: 
Callovian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
165.29

    Ending stage: 
Callovian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
163.41

Depositional setting

Infra littoral to sub littoral (transgressive) environment


Depositional pattern:  


Additional Information


Compiler:  

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