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

Karwar Fm

Period: 
Paleogene

Age Interval: 
Early to Late Eocene.


Province: 
S.India Kerala Konkan Basin

Type Locality and Naming

SUBSURFACE: The type section is in the Well KK-OS-V1-1, Interval is 1342-1429 and thickness is 87m. [Original Publication: Mathur, R.B., Sreekantswamy, H.N., Ananthakrishna, K., Srivatsava, U.C., Biswas, S.K., Krishna, A., Bhosale, J.S., Rao, K.V.N., Satyanarayana, Y., Rathod, G.D., Bose, P.K., and Karwal, S. 1993: Lithostratigraphy of Indian Petroliferous Basins, Document VI, Kerala Konkan Basin, KDMIPE, ONGC Publication, pp 1-33.]

[Figure 1: Location map of type section (after J.Mishra in Raju and Misra, 2009)]


Lithology and Thickness

Limestone. The lithology is consistently grey to light grey limestone with occasional thin shale beds.

[Figure 2: Lithostratigraphy of Kerala-Konkan Basin (from dghindia.gov.in)]


Lithology Pattern: 

Relationships and Distribution

Lower contact

Lower boundary is conformably overlies Kasargad Fm.

Upper contact

Upper boundary unconformable with either Calicut Fm , Cannore Fm or Mayyanad Fm.

Regional extent

This formation is present all over the basin, except the shallower part of the shelf.


GeoJSON

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Fossils

The index larger foraminifera include Nummulies fabianii, Nummulites burdigalensis, Assilina spinosa, Lituonella sp, Nummulites bagelensis.


Age 

Early to Late Eocene.

Age Span: 
Beginning stage: YpresianFraction up in beginning stage: 0.9Beginning date (Ma): Ending stage: PriabonianFraction up in ending stage: 0.8Ending date (Ma):

    Beginning stage: 
Ypresian

    Fraction up in beginning stage: 
0.9

    Beginning date (Ma): 
48.86

    Ending stage: 
Priabonian

    Fraction up in the ending stage: 
0.8

    Ending date (Ma):  
34.67

Depositional setting

Varies from Lagoonal and restricted marginal marine towards basin margin to inner neritic in deeper part of the basin.


Depositional pattern:  


Additional Information


Compiler:  

D.S.N Raju