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Fagfog Quartzite Formation
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Fagfog Quartzite Fm base reconstruction

Fagfog Quartzite Fm

Period: 
Statherian

Age Interval: 
early Statherian


Province: 
Nepal Lesser Himalaya

Type Locality and Naming

Katmandu region (Lesser Himalayan succession)


Lithology and Thickness

Arita et al. (1973, p. 107) defined this formation as white quartzites, ranging from colloidal varieties of fine chert to impure coarse quartz arenites with infrequent reddish and pale orange tints. The Fagfog Quartzite shows graded bedding, cross-lamination, and spectacular wave and current ripple marks. It also includes some thin (10–20 cm) gray-green phyllite and black slate intercalations. In many places, there are three quartzite bands separated by phyllites. Nanda (1973) reported some thin metabasic bands in the Fagfog Quartzite. The Fagfog Quartzite is about 350 m thick at its type locality, but its thickness varies widely. This formation was deposited round 1.7 Ga (Martin et al. 2011).


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

Martin (2017) interprets a major discontinuity (ca. 100 Myr) at the top of the underlying Kuncha Fm to the Fagfog Quartzite Fm,

Upper contact

With a thin zone of alternating phyllites and quartzites, the Fagfog Quartzite grades into the overlying Dandagaon Phyllites Fm. However, Martin (2017) implies a significant hiatus at their contact.

Regional extent


GeoJSON

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Fossils


Age 


Age Span: 

    Beginning stage: 
Statherian

    Fraction up in beginning stage: 
0.25

    Beginning date (Ma): 
1,750.00

    Ending stage: 
Statherian

    Fraction up in the ending stage: 
0.4

    Ending date (Ma):  
1,720.00

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.