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Chomule Formation
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Chomule Fm base reconstruction

Chomule Fm

Period: 
Triassic

Age Interval: 
early-Late Ladinian to Early Carnian


Province: 
NW Himalaya Zanskar-Spiti

Type Locality and Naming

Type section is in the Lingti brook, north of Lalung. [Original Publication: Bhargava, O.N. 1987. Lithostratigraphy, Microfacies and Palaeoenvironment of Scythian- Dogger Lilang Group, Spiti Valley, Himachal Himalaya. Journal of the Palaeontological. Society of India, 32: 92-107.]

Synonyms: Daonella Limestone followed by Halobia Beds. Uppermost Tamba Kurkur Gr.

[Figure: Zanskar-Spiti-Kumaun region location (provided by Om Bhargava)]

[Figure 0: History of Triassic lithostratigraphic nomenclature of Spiti (after Bhargava et al., 2004)]


Lithology and Thickness

Limestone. Thin- to medium-bedded dark gray to black limestone and marly limestone with little shale, two hard grounds in basal part. 85-100 m,

[Figure 1: Stratigraphic log of the Chomule Formation at Guling locality in Spiti (after Bhargava et al., 2004).


Lithology Pattern: 
Limestone


Relationships and Distribution

Lower contact

Lower contact with the Kaga Fm is conformable.

Upper contact

Gradational contact with the overlying Rama Fm.

Regional extent

Zanskar-Spiti and Himachal Pradesh to Kumaun-Garhwal region of Northwest Tethyan Himalaya


GeoJSON

{"type":"FeatureCollection","features":[{"type":"Feature","geometry":{"type":"Polygon","coordinates":[[[80.2,30.1],[78.5,31.4],[78,32.8],[77.6,34.6],[76,35.6],[74.4,36.3],[73.1,36.2],[73.1,35.7],[74.4,34.8],[75.6,34.5],[76.4,33.7],[76.9,32.7],[77.3,31.5],[78.3,30.3],[79.4,29.7],[80.1,29.4],[80.3,30.1]]]}}]}

Fossils

Daonella and Halobia, Daxatina, Trachyceras and Paragondolella polygnathiformis.


Age 

early-Late Ladinian to Early Carnian

Age Span: 

    Beginning stage: 
Ladinian

    Fraction up in beginning stage: 
0.6

    Beginning date (Ma): 
238.78

    Ending stage: 
Carnian

    Fraction up in the ending stage: 
0.3

    Ending date (Ma):  
234.09

Depositional setting

Neritic carbonate shelf environment that deepened towards NE (Bhargava, 2008)


Depositional pattern:  


Additional Information

It equals the classic Daonella Limestone and Halobia Beds.


Compiler:  

O.N. Bhargava & Birendra Singh.