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

Geku Fm

Period: 
Paleogene

Age Interval: 
Upper Paleocene


Province: 
Arunachal Pradesh

Type Locality and Naming

The type section is in Dite Deme-Yinkiong road. Arunachal Pradesh, a sequence of argillo-arenaceous sedimentary rocks associated with basic volcanics mapped around Yinkiong in the Siang valley. [Original Publication: Jain, A.K., Thakur, V.C. and Tandon, S. K. (1974): Stratigraphy and structure of Siang district, Arunachal Pradesh (NEFA) Himalaya, Him. Geol., 4, 28-60.]

[Figure 1: Location map of the area under study, Bhattacharyya et al., (2012)]


Lithology and Thickness

Volcanic and continental facies. Purple and pale green shales, sandstones, black shale, nodular grey shale, quartzite (occasionally calcareous). Its thickness is about 2774 m.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

Unconformity over Yamne Fm (Permian).

Upper contact

Gradational contact with overlying Dalbuing Fm.

Regional extent

Easternmost Lesser Himalayas.


GeoJSON

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Fossils

Dicot plant fossils like Apocynophyllum sp., Canavalia sp., Hicora sp. and Sophera sp.


Age 

Upper Paleocene.

Age Span: 

    Beginning stage: 
Thanetian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
59.24

    Ending stage: 
Thanetian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
56.00

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

D.S.N Raju