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Heklang Formation
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Heklang Fm base reconstruction

Heklang Fm

Period: 
Statherian

Age Interval: 
late Statherian


Province: 
Nepal Lesser Himalaya

Type Locality and Naming

Tansen and lower Kali Gandaki region


Lithology and Thickness

"The Heklang Formation is made up essentially of dark gray-green slates and phyllites. When weathered, they exhibit brown and gray tints. The phyllites frequently alternate with up to 10 m thick bands, incorporating calcareous laminae. There also appear some dark brown weathering subordinate beds of calcareous sandstone, marl, and dolomite. The Heklang Formation is more than 800 m thick at its type locality (Sakai 1985, p. 346)."


Lithology Pattern: 
Claystone


Relationships and Distribution

Lower contact

Regionally, the next older unit might be the Nayagaun Fm in the Intermediate Zone of Gandaki region (Heklang Fm is in the Inner Zone of Gandaki region), but there is a major thrust fault between.

Upper contact

The transitional contact between the Heklang Fm and the overlying Virkot Fm is placed at the first appearance of red-purple slate.

Regional extent


GeoJSON

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Fossils


Age 

Martin (2017) schematically suggests late Statherian (ca. 1630 Ma)

Age Span: 

    Beginning stage: 
Statherian

    Fraction up in beginning stage: 
0.75

    Beginning date (Ma): 
1,650.00

    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.