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Bijni Formation
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Bijni Fm base reconstruction

Bijni Fm

Period: 
Permian

Age Interval: 
Early Permian


Province: 
N.India Lesser Himalaya

Type Locality and Naming

Uttarakhand, Type section is at Bijni in Garhwal syncline. [Original Publication: Shanker, R., and Ganesan, T.M.., 1973.: A Note on the Garhwal Nappe. Him. Geol. 3, 72—82.]


Lithology and Thickness

Pebbly mudstone. Comprises essentially of pebble-slate, boulder-slate, grit-slate, slaty shale with minor quartzite, conglomerate and greenish grey well cleaved pencil shale; ~5-80 m.


Lithology Pattern: 
Glacial till


Relationships and Distribution

Lower contact

Unconformable with Tal Quartzite Fm / Deona Fm

Upper contact

Unconformable with Nilkanth Fm.

Regional extent

Uttarakhand. Correlated with Sisne Fm in Nepal, Rangit Pebble Bed in Darjeeling, and Diuri Formation in Bhutan (Nandi 1975; Laskar and Roy Chowdhury 1977; Bhargava 2008). The basic character of these correlatable formations is their overall arenaceous composition, frequently associated with coaly units, and discontinuous horizons with rich near-coastal and marine macro-invertebrates.


GeoJSON

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Fossils

Bryozoan: Fenestella, Polypora and Dogaddanella (Ganesan, 1972), Protoretiora ampla, Rhombopora sp., (Shaker and Ganesan, 1973).

Brachiopods and Lamellibranch: Pecten sp., Aviculopecten sp., Palaeolucina sp., Spirifer sp., Productus sp., Syringothyris sp., Marginifera sp., Chonetes sp.,


Age 

Age span is same as Sisne Fm in Nepal.

Age Span: 

    Beginning stage: 
Asselian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
296.21

    Ending stage: 
Artinskian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
286.91

Depositional setting

Not Available


Depositional pattern:  


Additional Information


Compiler:  

O.N. Bhargava & Birendra Singh.