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Bhainsedobham Marble Formation
Click to display on map of the Ancient World at:
Bhainsedobham Marble Fm base reconstruction

Bhainsedobham Marble Fm

Period: 
Ediacaran

Age Interval: 
middle Ediacaran


Province: 
Nepal Lesser Himalaya

Type Locality and Naming

Katmandu region (Tethyan sequence)


Lithology and Thickness

"The main component of the Bhainsedobhan Marble at its type locality appears in coarse to very coarse crystalline (up to a few mm long calcite grains), saccharoidal form. The white marble also contains some pale yellow, pinkish or light brown dolomitic marble lenses and bands. Although the rock seems massive at first glance, close inspection reveals thin banding and foliation defined by biotite, muscovite, and phlogopite. The uppermost and lowermost zones of the Bhainsedobhan Marble are rather thinly banded and contain biotite schist and garnetiferous schist as intercalations. The two zones represent the passage into the underlying Raduwa Fm and overlying Kalitar Fm, respectively. The Bhainsedobhan Marble is about 800 m thick at its type locality (Stöcklin and Bhattarai 1977, p. 24).


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

Martin (2017) implies that the contact to the underlying Raduwa Fm is a minor discontinuity; but alternatively the Bhainsedobhan Marble Fm has a "transitional passage from the underlying Raduwa Fm" (Dhital, 2015).

Upper contact

The Lower Schist Member of the Kalitar Fm overlies the Bhainsedobhan Marble Fm. Martin (2017) implies that this contact is a minor discontinuity; but alternatively the Bhainsedobhan Marble Fm has a "transitional passage into the overlying Kalitar Fm" (Dhital, 2015).

Regional extent

"It is important to note that the Bhainsedobhan Marble serves as a marker horizon, inasmuch as it can be traced continuously for tens of kilometers. The closure of the Mahabharat Synclinorium is excellently delineated by this formation."


GeoJSON

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Fossils


Age 


Age Span: 

    Beginning stage: 
Ediacaran

    Fraction up in beginning stage: 
0.7

    Beginning date (Ma): 
567.66

    Ending stage: 
Ediacaran

    Fraction up in the ending stage: 
0.8

    Ending date (Ma):  
558.04

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.