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Jaishidanda Formation

Jaishidanda Fm

Period: 
Permian

Age Interval: 


Province: 
Bhutan

Type Locality and Naming

Lesser Himalaya


Lithology and Thickness

"Gray, biotite-rich, locally garnet-bearing schist, interbedded with gray to tan, biotite lamination-bearing, lithic clast-rich quartzite (Bhargava, 1995; Dasgupta, 1995; Long et al., 2011A). Typically 600-900 m-thick, but 1,700 m-thick along Kuri (Long et al., 2011A). Upper greenschist to lower amphibolite facies (Gansser, 1983)." [Martin, 2017, generalized diagram implies that lower half is dominated by claystone, and upper half is more sandy.]


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

Conformably (?) overlies diamictite-rich Rangit Fm (western Bhutan) or pebbly-mudstone glacio-marine Douri Fm (eastern Bhutan)

Upper contact

Major unconformity (ca. 200 Myr) below Chunabali Fm (Miocene) in western Bhutan, or below Siwalik Gr in eastern Bhutan.

Regional extent


GeoJSON

null

Fossils


Age 

Early to Middle Permian

Age Span: 

    Beginning stage: 
Artinskian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
286.91

    Ending stage: 
Capitanian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
261.94

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Extract from Legend to "Geologic Map of Bhutan" (Long, S., McQuarrie, N., et al., 2011, Journal of Maps). Age spans estimated from correlation diagrams in Martin, A.J. (2017, "A review of Himalayan stratigraphy, magmatism, and structure", Gondwana Research, 49: 42-80; http://dx.doi.org/10.1016/j.gr.2017.04.031), but these are often controversial.