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Mar Formation
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Mar Fm base reconstruction

Mar Fm

Period: 
Quaternary

Age Interval: 
Sub-recent to Recent


Province: 
NW.India Rajastan-Bikaner-Nagaur Basin

Type Locality and Naming

OUTCROP: Good exposures are seen around Mar village. The name was proposed by Shrivastava and Srinivasan (1962) to a litho unit consisting of ferruginous grit, conglomerate and sandstone exposed in cuestas. [Original Publication: Shrivastava, B.P., and Srinivasan, S., 1962: Geology of the area around Bap Nagaur, Western Rajasthan: Progress Report for the year 1961-62. ONGC Report (Unpublished)],

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


Lithology and Thickness

Conglomerate to Soil. In type section, the sediments of Mar Formation in ascending order comprises poorly consolidated, crudely stratified conglomerate, gritty sandstone and ferruginous sandy clays, recent lime Kankar, lateritic soil, gypsite, calcite and windblown sand. In well Pugal-1, the formation is 100 m thick and is represented by unconsolidated fine- to medium-grained sand which is occasionally gritty with calcareous concretion.

[Figure 2: Generalized and Subsurface Stratigraphy of Bikaner-Nagaur Basin ((from dghindia.gov.in)]


Lithology Pattern: 
Soil


Relationships and Distribution

Lower contact

Lower boundary rests unconformably over Jogira Fm (Eocene) around Bithnok, Chak Madhogarh and Madal Charan and over Marh Fm (Eocene) near Grandhi and Girjasar.

Upper contact

Upper boundary is covered by recent sand and sand dunes.

Regional extent

[Figure 3: Stratigraphic Correlation of Rajasthan Basins (from dghindia.gov.in)]


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[71.64,27.44],[72.49,27.83],[73.52,27.99],[73.57,27.48],[74.35,27.23],[73.78,25.91],[72.05,26.73],[71.64,27.44]]]]}}

Fossils

No mega or microfauna/flora have been reported from this formation. Saproo et al., (1977) have reported reworked fossils of Jogira Fm from the conglomerate near Jogira Talao.


Age 

A Quaternary (Sub-recent to Recent) age has been assigned to Mar Formation.

Age Span: 

    Beginning stage: 
Gelasian

    Fraction up in beginning stage: 
0.3

    Beginning date (Ma): 
2.35

    Ending stage: 
Chibanian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
0.45

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

D.S.N Raju