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Nayagaun Formation
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Nayagaun Fm base reconstruction

Nayagaun Fm

Period: 
Statherian

Age Interval: 
middle Statherian


Province: 
Nepal Lesser Himalaya

Type Locality and Naming

Kali Gandaki region (Intermediate Zone of Kusma-Syangja)


Lithology and Thickness

Metamorphosed claystone. " The phyllites, which constitute more than 75% of the Nayagaun Formation, are somber to dark green-colored, and they are generally free of grits. They are often-times fine-grained, regularly parallel-laminated, and alternating with thin to thick (a few cm to 1 m), wavy to lenticular bands of gray to green-gray, fine quartzites.


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

Assumed to disconformably overly the Naudanda Quartzite Fm.

Upper contact

Regionally, the next younger unit might be the Heklang Fm is in the Inner Zone of Gandaki region where nothing older is exposies (the Nayagaun Fm in the Intermediate Zone of Gandaki region), but there is a major thrust fault between. In the Intermediate Zone, this Nayagaun Fm is overlain by the Nourpiu Fm, which is described in the Katmandu region of Lesser Himalaya.

Regional extent

"The stratigraphic position of this formation is rather uncertain, and it is assumed to be equivalent to the Dandagaon Phyllites of Stöcklin and Bhattarai (1977)" in the Katmandu region."


GeoJSON

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Fossils


Age 

Assuming coeval with the lower Dandagoan Fm and no significant break with the ?overlying? Heklang Fm, then early Late-Statherian

Age Span: 

    Beginning stage: 
Statherian

    Fraction up in beginning stage: 
0.7

    Beginning date (Ma): 
1,660.00

    Ending stage: 
Statherian

    Fraction up in the ending stage: 
0.8

    Ending date (Ma):  
1,640.00

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Descriptions from Megh Raj Dhital (2015, Geology of Nepal: Regional Perspective of the Classic Collided Orogen, Springer Publ., 499 pp.). 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.