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Miri Formation
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Miri Fm base reconstruction

Miri Fm

Period: 
Permian

Age Interval: 
Early Permian (Asselian-Sakmarian?)


Province: 
Arunachal Pradesh

Type Locality and Naming

Arunachal Pradesh, named after Miri Hills. [Original Publication: Laskar, B. 1958. In Director's Annual General Report for 1953. Records Geological Survey of India, v. 87(1), pp. 46-47.]


Lithology and Thickness

Conglomerate to claystone. Sequence of conglomerate, sandstone/quartzite, purple shale and diamictite.


Lithology Pattern: 
Glacial till


Relationships and Distribution

Lower contact

Unconformable contact with the Khetabari Fm and Tenga Fm.

Upper contact

Conformably overlain by the Bichom Fm.

Regional extent

Easternmost Lesser Himalayas. Bame-Daparizo road section, Sessa and Wichephu along Bhalukpong-Bomdila Road.


GeoJSON

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Fossils

Trace fossils Skolithos and Planolites both having long range from Precambrian/Cambrian to Recent.


Age 

Lower Permian? / Lower to Middle Paleozoic. [Temporarily put as Sakmarian here, to be coeval with other regional glacial beds.]

Age Span: 

    Beginning stage: 
Asselian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
296.21

    Ending stage: 
Sakmarian

    Fraction up in the ending stage: 
0.6

    Ending date (Ma):  
291.71

Depositional setting


Depositional pattern:  


Additional Information

Tewari (2005) on the basis of ichnofossils had suggested an early Cambrian age. However, in view of its conformable contact with the overlying Bichom Fm containing Lower Permian fossils and identical diamictite beds in the Miri Fm and that Bichom Fm, a Lower Permian is suggested, Kumar (1997). [Temporarily put as Artinskian-Sakmarian here, to be coeval with other regional glacial-marine beds.]


Compiler:  

D.S.N Raju