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Nabi Formation
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Nabi Fm base reconstruction

Nabi Fm

Period: 
Carboniferous

Age Interval: 
Middle - Late Carboniferous (330-298 Ma)


Province: 
NW Himalaya Kumaun-Garhwal Tethyan Himalaya

Type Locality and Naming

Type section is in Nabi village in Kuthi-Youngti Valley. Kumaun-Garhwal region. [Original Publication: Mamgain, V.D., and Mishra, R.S., 1989 . Biostratigraphic studies of the Palaeozoic and Mesozoic sediments of Tethyan facies in U.P. Himalaya. Geol. Surv. India, Rec., 122(3), 296-298]

Synonyms: Girthigal Formation by Malviya et al., 1991

[Figure 1: Location of the Kumaun-Garhwal region (from Celerier et al., GSA Bull 2009)]

[Figure 2: Geologic map of the Kumaun-Garhwal region (from Celerier et al., GSA Bull 2009)]


Lithology and Thickness

Clayey limestone. Brownish weathering limestone and grey sandy shale. Singh (2009/Raju chart) description: Formation is 20-30 m thick; and is comparable to Fenestella Shale of Kashmire. Black carbonaceous shales interbedded with subordinate black limestones that has yielded Middle Carboniferous fossil assemblage.


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

Conformable contact with the Kali Fm.

Upper contact

Sharp upper contact with the Girthi Fm.

Regional extent

Kumaun to Garhwal regions


GeoJSON

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Fossils

Bryozoans: Fensestellaplebi; Protoretepora cf. ampla; Spirifer middlemissi and Productus (=wagenoconcha) cf. scabriculo (Valdiya and Gupta, 1972)


Age 

Middle Carboniferous- Late Carboniferous. If correlative with Fenestrella Shales Fm, then late-Early to mid-Late Carboniferous (used here)

Age Span: 

    Beginning stage: 
Visean

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
338.54

    Ending stage: 
Bashkirian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
315.15

Depositional setting

Not available.


Depositional pattern:  


Additional Information


Compiler:  

Birendra Singh & O.N. Bhargava.