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Chekha Formation

Chekha Fm

Period: 
Cambrian

Age Interval: 
late-middle Cambrian


Province: 
Bhutan

Type Locality and Naming

Tethyan Himalaya. Named by Gansser (1983).

Synonym: Sangsing La Fm


Lithology and Thickness

Tan to gray, thick-bedded, fine- to medium-grained, cliff-forming, micaceous quartzite, interbedded with biotite-muscovite-garnet schist in eastern and central Bhutan (Tangri and Pande, 1995; Long and McQuarrie, 2010). Interbedded with green to white, thin-bedded marble in Dang Chu klippe. Dominated by tan, cliff-forming marble, with lesser gray phyllite and dark-gray phyllitic quartzite in Lingshi region (Gansser, 1983). Dominantly upper greenschist facies (Gansser, 1983). 2.2-4.0 km-thick (Long et al., 2011B).


Lithology Pattern: 
Sandy limestone


Relationships and Distribution

Lower contact

Unconformity onto Precambrian "Lower Greater Himalayan protoliths"

Upper contact

Diagram of Martin (2017) is ambiguous if conformably overlain by Pele La Gr, or disconformable below the Tang Chu Gr.

Regional extent


GeoJSON

null

Fossils


Age 

Indicated as late-middle Cambrian on Martin (2017) diagram for part below Pele La Gr; but might extend upward into early Ordovician elsewhere.

Age Span: 

    Beginning stage: 
Cambrian Stage 4

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
514.50

    Ending stage: 
Drumian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
500.50

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Extract from Legend to "Geologic Map of Bhutan" (Long, S., McQuarrie, N., et al., 2011, Journal of Maps). 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.