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Nirona Formation
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Nirona Fm base reconstruction

Nirona Fm

Period: 
Jurassic

Age Interval: 
Rhaetian(?)-Aalenian (early Jurassic)


Province: 
W.India Kutch Basin

Type Locality and Naming

Subsurface: Interval 1710-2210 m in Well Nirona-1 (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

Conglomerate. Conglomerate, sandstone with weathered reddish brown rock fragments with bands of siltstone and very thin limestone. In Banni-2 the formation also contains orthoquartzite sandstone. 470 m in the type section, in Banni-2 area the thick is only 293 m


Lithology Pattern: 
Conglomerate


Relationships and Distribution

Lower contact

Lower boundary in non-conformable with the Precambrian basement. Precambrian basement forms the floor of the Kutch Basin and is exposed in Meruda Hills, and Nagar Parkar hills in the northern part of the Basin. In the sub-surface the basement have been encountered in wells Banni-2 and Nirona-1.

Upper contact

Upper contact in Banni-2 in unconformable with the Lodai Fm

Regional extent


GeoJSON

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Fossils

The formation is devoid of microfauna. Some Palynofossils assemblages have been reported


Age 

"Based on superposition and palynofossils assemblages Triassic (?) to Aalenian (Middle Jurassic) has been assigned"

Age Span: 

    Beginning stage: 
Rhaetian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
205.74

    Ending stage: 
Toarcian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
174.70

Depositional setting

Continental


Depositional pattern:  


Additional Information


Compiler:  

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