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

Jhurio Fm

Period: 
Jurassic

Age Interval: 
Bathonian-Callovian (middle Jurassic)


Province: 
W.India Kutch Basin

Type Locality and Naming

Jhurio (Jharu Hill), north of Bhuj, type section is along a nala about 0.8 km west of Badi (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

Limestone. White limestone (pelmicrite and pelsparite); older oolitic bands with shale and limestone occur towards the middle and lower sections. In the type section it is +287 m, in subsurface thick varies from 665 to 800 m.


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

Not recognized/exposed in the type section, in the subsurface disconformable with underlying Kaladongar Fm

Upper contact

Conformable with the overlying Jumara Fm claystone, in the subsurface a fall in resistivity and increase in gamma count is noticed against this contact

Regional extent


GeoJSON

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Fossils

Common mega fossils observed are Ammonite sp., Rhynconell sp., Trigonia sp., Ostrea sp., Belmenites sp., Epostomina regularis, E. ghosi etc. (Pandey and Dave, 1993).


Age 

Bathonian to Callovian (Middle Jurassic)

Age Span: 

    Beginning stage: 
Bathonian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
168.17

    Ending stage: 
Bathonian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
165.29

Depositional setting

The formation was deposited in a sub littoral transgressive environment


Depositional pattern:  


Additional Information


Compiler:  

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