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Chilika Formation
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Chilika Fm base reconstruction

Chilika Fm

Period: 
Paleogene

Age Interval: 
Early Oligocene to lower part of Late Oligocene.


Province: 
E.India Mahanadi Basin

Type Locality and Naming

SUBSURFACE: Well MND-8, Interval is 3204-3838 m and thickness is 634 m. [Original Publication: Raju D.S.N, Dwivedi R.N, Misra Ravi, Stratigraphy of Mahanadi Basin, (2009) pp 293-296 in Raju and Misra (2009), ONGC Bulletin, Vol. 44, no.2]

Synonyms: Lower part of Sequence-II of Mohapatra, 2006 and stages M-6 and M-7 of Pandey (1986).


Lithology and Thickness

Sandy claystone. Predominantly shale with some sand layers. About 630 m in the type section.

[Figure 1: Location Map of well MND -8 (modified after Shukla et al., 2014)]

[Figure 2: The lithocolumn of the type (Holo) section of the Chilika Formation in Well MND - 8 showing the foraminiferal assemblage, age, and paleobathymetry (modified after Pandey, J., ONGC, 1986)]


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

Lower boundary to Kalighat Fm is a pronounced erosional unconformity and subaerial exposures with major hiatus; but is conformable in MND-8 (?)

Upper contact

Upper boundary to Konark Fm is unconformable and hiatus is >12 Myr (in shallow)

Regional extent


GeoJSON

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Fossils

Nummulites pengaroenensis in lower part, Eulepidina dialata in the middle part, Globigerina ampliapertura, G. selli, Sphaeroidia bullodes, Globigerinoides primordius and Cyclammina sp., in the upper part of the type section.


Age 

Early Oligocene to lower part of Late Oligocene.

Age Span: 

    Beginning stage: 
Rupelian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
33.90

    Ending stage: 
Chattian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
25.16

Depositional setting

Shallow marine conditions in the lower part while outer shelf/upper bathyal conditions in the upper part prevailed in the type section.


Depositional pattern:  


Additional Information


Compiler:  

D.S.N Raju