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Larjung Formation
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Larjung Fm base reconstruction

Larjung Fm

Period: 
Ordovician

Age Interval: 
early Ordovician


Province: 
Nepal Tethyan Himalaya

Type Locality and Naming

The Larjung Formation represented by very thick massive marbles that almost completely surround the valley of Kali Gandaki to the north of Dhampu.


Lithology and Thickness

Larjung Formation thus constitutes a metamorphic succession, composed of marbles developed on top of the impure marbles and gneisses. The very thick (about 600 m) and massive marbles include white, bluish, and yellow bands, constituting mesoscopic (tens of meters) folds verging due north. This sequence is succeeded by about 150 m of rather thinly banded micaceous impure marble, forming a topographic depression.


Lithology Pattern: 
Gneiss


Relationships and Distribution

Lower contact

The Larjung Formation thus constitutes a metamorphic succession, composed of marbles developed on top of the impure marbles and gneisses.

Upper contact

Transitional to the overlying Nilgiri Limestone Fm.

Regional extent


GeoJSON

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Fossils


Age 

Uncertain; but assigned to lower Ordovician and may extend down into upper Cambrian. Its assignment to the earliest Paleozoic is based primarily on the conformable contact with the overlying strata.

Age Span: 

    Beginning stage: 
Tremadocian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
486.85

    Ending stage: 
Floian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
471.26

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.).