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Bandah Formation
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Bandah Fm base reconstruction

Bandah Fm


Period: 
Paleogene

Age Interval: 
Middle to Late Eocene


Province: 
NW.India Rajastan-Jaisalmer Basin

Type Locality and Naming

OUTCROP. Proposed by Narayan (1959) after village Bandah with its type section south of Bandah; redefined by Mishra et al., (1993). [Original Publication: Narayanan, K. 1959. Progress report on the geological work in Jaisalmer, ONGC report (unpublished)]. Reference well: In two locations, Batrewala Tibba and Shumarwali Talai, and well Kharatar-1, (interval 302-511m).


Lithology and Thickness

Clayey limestone. In the type area it consists of predominantly of limestone. Yellow calcareous siltstone, greenish marl, bentonitic greenish clays thin beds of calcite at the base. The middle and upper parts comprise of shale and limestone occasionally laterites. About 30 m thickness.

[Figure 1: Location map of West Rajasthan Basins (after Pandey and Dave, 1998)]

[Figure 2: Facies Analysis, Reservoir Characterization and Depositional Environment study of Hydrocarbon bearing Tertiary Sequences in Jaisalmer Basin, Rajasthan (after R. Pandey et.al., 2019), ONGC Bulletin, Vol. 54, No.1)]

[Figure 3: Generalized and Subsurface Stratigraphy of Jaisalmer Basin (from dghindia.gov.in)]


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

In outcrops, the lower boundary has a disconformable contact with underlying Khuiala Fm. In subsurface, the lower boundary is placed between the limestone of Bandah Fm and calcareous/sandy shales of Khuiala Fm.

Upper contact

The upper boundary is marked by a pronounced unconformity throughout the basin. It is overlapped by the Shumar Fm (Plio-Pleist.)

Regional extent

[Figure 4: Stratigraphic Correlation of Rajasthan Basins (from dghindia.gov.in)]


GeoJSON

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Fossils

Foraminiferal assemblage recorded by Sigal et al., (1971) and Singh (1976,1984) includes: Nummulites acutus, N. maculates, N. beaumonti, N. pengaronensis, N. cuivelleri, Discocyclina javana var. indica, D. dispansa, D. sowerby, Fasciolites ellipitica, Assilina spira, A. papillata, A. subpapillata, Dictyoconoides cooki. Others include Globigerinatheka kugleri, Truncoroloides topilensis and Turborotalia cerroazulensis. Singh (1984) has recorded a different assemblage from the top most part of this formation in the Kharatar area. They include N. pengaronensis, Pelllatispira sp., Baculogypsinoides sp. and Chiloguembelina sp. from this horizon. Ostracodes: Characteristic ostracodes recorded are: Alocopocythere transversa morp.A, Anommatocythere confirmata, Echinocythereis (S.) sahnii, Gyrocythere exaggerate, Cytherelloidea khartarensis, Alocopocythere transversa morph-A, Stigmatocythere lumaria morph.B and Echinocythereis (S.) sparsa.


Age 

Based on the faunal evidences, a Middle to Late Eocene is suggested. (ca. 48 to 34 Ma)

Age Span: 

    Beginning stage: 
Ypresian

    Fraction up in beginning stage: 
0.95

    Beginning date (Ma): 
48.47

    Ending stage: 
Priabonian

    Fraction up in the ending stage: 
0.9

    Ending date (Ma):  
34.29

Depositional setting

Foraminifera from the limestone greenish grey clay and glauconitic marl in association with planktics suggest inner to middle shelf conditions. The upper part of Bandah Formation deposited in shallow inner neritic.


Depositional pattern:  


Additional Information


Compiler:  

D.S.N Raju