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Dalbuing Formation
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Dalbuing Fm base reconstruction

Dalbuing Fm

Period: 
Paleogene

Age Interval: 
Early Eocene.


Province: 
Arunachal Pradesh

Type Locality and Naming

Arunachal Pradesh, Dalbuing Fm named by Singh (1984) after the village Dalbuing has a restricted occurrence in the Yamne valley. [Original Publication: Singh, S., 1984. A reappraisal of Yinkiong Fm with reference to Dalbuing area, East Siang district, Arunachal Himalaya. Ind. Minerals 38(2): 34-38]


Lithology and Thickness

Shallow-marine marl. Limestones, phyllites (foliated claystone) and shales.


Lithology Pattern: 
Shallow-marine marl


Relationships and Distribution

Lower contact

Gradational contact with the Geku Fm.

Upper contact

Tectonic -- Abor Volcanic Fm or the quartzite of the Tenga Fm tectonically overlie the formation along Roing Fault.

Regional extent

Easternmost Lesser Himalayas. Yamne Valley from east of Yinkiong to southeast of Dumro in the Sipung Korong stream.


GeoJSON

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Fossils

Foraminifera of Nummulites atacicus, Assilina dandotica, A. daviesi, N. Laminose, N. globulus, A. spinosa, etc. (Singh T., 1983). Prasad and Dey (1986) reported palynomorphs of Dandotiaspora, Cyathidites, Malayaeaspora, Foveotrilete, Spinainaperturites etc.


Age 

Early Eocene. Prasad and Dey (1986) compared their palynomorphs assemblages with assemblages of Cauvery Basin (Venkatachala & Rawat, 1972).

Age Span: 

    Beginning stage: 
Ypresian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
56.00

    Ending stage: 
Lutetian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
41.03

Depositional setting


Depositional pattern:  


Additional Information

Prasad and Dey (1986) reported pterydophytic spores, gymnosperm and angiosperm pollens and phytoplanktons from the Dalbuing Fm. The assemblage is dominated by triporate and tricolporate palynomorphs suggesting an Early Eocene age. Some reworked Lower Gondwana palynomorphs are also recorded in the Dalbuing Fm (Kumar, 1997).


Compiler:  

D.S.N Raju