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Dandagaon Phyllites Formation
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Dandagaon Phyllites Fm base reconstruction

Dandagaon Phyllites Fm

Period: 
Statherian

Age Interval: 
late Statherian


Province: 
Nepal Lesser Himalaya

Type Locality and Naming

Katmandu region (Lesser Himalayan succession)


Lithology and Thickness

This formation is composed of rather uniform argillaceous to finely quartzitic phyllites of dark blue-green color, and these rocks often display reddish-weathering tints. A millimeter to a centimeter-thick green quartzite bands containing sericite and chlorite are also present. There also set in very infrequent thin bands of dense dolomite and calc-phyllite exhibiting fine lamination. These calc-phyllites exhibit brown calcareous laminae, alternating with green chlorite laminae. Some lenses and nodules of quartz are also present in the Dandagaon Phyllites. The Dandagaon Phyllites are about 1,000 m thick.


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

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

Upper contact

The Dandagaon Phyllites exhibit a sharp but gradational contact with the overlying Nourpul Fm The Purebesi Quartzite Member at the base of the Nourpoi Fm overlies the predominantly phyllitic Dandagaon Phyllites Fm.

Regional extent


GeoJSON

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Fossils


Age 


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: 
0.95

    Ending date (Ma):  
1,610.00

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.