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Daman Formation
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Daman Fm base reconstruction

Daman Fm

Period: 
Paleogene

Age Interval: 
Late Oligocene-Early Miocene


Province: 
W.India Mumbai Offshore

Type Locality and Naming

Well C – 2 – 1, (depth interval 1750 – 2120 m). [Original Publication: Basu, D.N., Banerjee, A and Tamhane, D.M. 1982. Facies distribution and petroleum geology of Bombay Offshore Basin, India. Journal Petroleum Geology, Volume 5, pp. 57-75.]

[Figure: Lithostratigraphy in Mumbai Offshore blocks (from NDRDGH.gov.in; after Jitendra Misra, 2009)]


Lithology and Thickness

Clayey sandstone. In the type section, the formation is represented by a sandstone-shale alteration. The shale is grey to dark grey, fissile, splintery, occasionally silty and carbonaceous. A few coal lenticles and rounded spherulite bodies are also observed.

In the type section, the formation is 370 m thick. Maximum thickness of this formation has been mapped around the South Tapti structure.

[Figure 1: Formations and their reference sections in Mumbai Offshore Basin (after Pandey and Dave, 1998)]


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

The Daman Formation is unconformably underlain by the Mahuva Fm.

Upper contact

It is unconformably overlain by the Mahim Fm.

Regional extent


GeoJSON

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Fossils

The formation is poorly fossiliferous.]


Age 

Being the lateral facies equivalent of the Alibag Fm, this has been assigned Late Oligocene-Early Miocene age.

Age Span: 

    Beginning stage: 
Rupelian

    Fraction up in beginning stage: 
0.95

    Beginning date (Ma): 
27.62

    Ending stage: 
Chattian

    Fraction up in the ending stage: 
0.8

    Ending date (Ma):  
23.89

Depositional setting

Varies from fluvial with tidal influence in the northern part, to tidal flat and near shore conditions in the central part of Tapti-Daman block (Peters, 1981). During this period, Surat Depression experienced the maximum subsidence-accumulating thick under compacted claystone relating to the prograding delta from northeast.


Depositional pattern:  


Additional Information


Compiler:  

D.S.N Raju