Home Multi-Country Search About Admin Login
Cenozoic
Mesozoic
Paleozoic
Neoproterozoic
Mesoproterozoic
Paleoproterozoic

Search by
Select Region(s) to search
Hold Ctrl (Windows/Linux) or Command (Mac) to select multiple
Jaunsar Gr
Click to display on map of the Ancient World at:
Jaunsar Gr base reconstruction

Jaunsar Gr

Period: 
Neoproterozoic

Age Interval: 
Tonian


Province: 
N.India Lesser Himalaya

Type Locality and Naming

Himachal Pradesh-Uttarakhand, Deoban Basin, [Original Publication: Auden, J.B. (1934). The Geology of the Krol Belt. Rec. Geol. Surv. India, 67, 357-454.]


Lithology and Thickness

Sandy claystone. In approximate Upper to Lower (descending) order: Nagthat Fm Quartz arenite, quartz wacke, arkose, grit, conglomerate, clay-slates, phyllites / Chandpur Fm Fine alternation of shale, siltstone, quartzwacke / Mandhali Fm Conglomerate, shale, siltstone, limestone, dolostone


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

Unconformable with Deoban Gr in Deoban Basin, Discordant contact with Deoban Gr in the type area of Tons valley, but with break or unconformity elsewhere in Kumaun Region.

Upper contact

Conformable with the Blaini Fm.

Regional extent

The Nathuakhan Fm (Uttarakhand) is also equivalent of the Simla/Jaunsar sequences. The Benighat Slates in Nepal (Dhital 2014) and the Puntsholing and Pangsari formations in Bhutan (Tangri 1995a; Bhargava 1995b) are equivalents of the Simla/ Jaunsar Gr. (Bhargava et al., 2021. Evolution of the Lesser Himalaya in space and time. Himalayan Geology, Vol. 42 (2), 2021, pp. 263-289)


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[76.86,32.93],[76.28,33.02],[76.81,31.7],[77.38,30.95],[79.23,29.66],[80.13,29.32],[80.37,29.97],[79.78,30.1],[78.44,31.25],[77.6,31.59],[77.56,32],[76.86,32.93]]]]}}

Fossils


Age 

Ediacaran. Age span estimates taken from A.J. Martin, 2017. A review of Himalayan stratigraphy, magmatism, and structure. Gondwana Research 49 (2017) 42–80.

Age Span: 

    Beginning stage: 
Tonian

    Fraction up in beginning stage: 
0.3

    Beginning date (Ma): 
916.00

    Ending stage: 
Tonian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
720.00

Depositional setting

Shallow-marine environment in Nagthat Fm, Shelf-mud transition zone of a tidal flat complex, with local turbidites in Chandpur Fm, Marine, shallow-subtidal environment in Mandhali Fm.


Depositional pattern:  


Additional Information


Compiler:  

O.N. Bhargava & Birendra Singh. Age estimates based on A.J. Martin, 2017. A review of Himalayan stratigraphy, magmatism, and structure. Gondwana Research 49 (2017) 42–80.