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Deoban Gr
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Deoban Gr base reconstruction

Deoban Gr

Period: 
Mesoproterozoic

Age Interval: 
early Calymmian


Province: 
N.India Lesser Himalaya

Type Locality and Naming

Himachal Pradesh-Uttarakhand, Deoban Basin, [Original Publication: Ganesan, T.M., Verma, R.N. (1981) The Deoban structural belt of Garhwal Himalaya. Jour. Geol. Soc., India 22, 201-215]

Synonym: Deoban Fm, Gangolihat Fm (After the village Gangolihat in western Pithoragarh District).


Lithology and Thickness

In approximate Upper to Lower (descending) order: Ambota Fm Oolitic limestone, breccia, pink, purple, green limestone, stromatolitic limestone, dolostone, platy limestone with shale / Bohar Fm Bluish grey stromatolitic limestone, buff white dolostone, shale, calcareous siltstone, carbonaceous shale, gritty sandstone, conglomerate / Tiontar Fm Shale with thin arenite beds. Thickness highly variable, between the Tons and Jamuna valleys


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

Nonconformable with Dharagard Gr.

Upper contact

Unconformable with Mandhali Fm.

Regional extent


GeoJSON

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Fossils

Baicalia, Masloviella, Kussiella and Minjaria (Stromatolitic forms) Valdiya, 1969a of Middle Riphean age. Azmi and Paul 2004 reported Prohertzina anabania missarzhevskey, P. robusta Quian, P. siciformis missarzhevskey.


Age 

Ca. 1600-1550 age span estimates for Gangolihat Fm-Deoban Fm from McKenzie, N.R., Hughes, N.C., Myrow, P.M., Xiao, S., Sharma, M. 2011. Correlation of Precambrian-Cambrian sedimentary successions across northern India and the utility of isotopic signatures of Himalayan lithotectonic zones. Earth and Planetary Science Letters, 312, 471-483. This is similar to the ca. 1600-1550 Ma age span for Gangolihat Fm (which Sinha (2021 for Dr. Raju's Lexicon had indicated is a synonym for Deoban Gr, Deoban Fm) as indicated by A.J. Martin (2017. A review of Himalayan stratigraphy, magmatism, and structure. Gondwana Research 49 (2017) 42–80). Therefore, the range 1600-1555 is adopted here for the Deoban Gr, and each component formation is given a 15 Myr span.

Age Span: 

    Beginning stage: 
Calymmian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,600.00

    Ending stage: 
Calymmian

    Fraction up in the ending stage: 
0.23

    Ending date (Ma):  
1,554.00

Depositional setting

Shallow marine environment


Depositional pattern:  


Additional Information


Compiler:  

O.N. Bhargava & Birendra Singh.