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Belapur Formation
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Belapur Fm base reconstruction

Belapur Fm

Period: 
Paleogene

Age Interval: 
early Middle Eocene


Province: 
W.India Mumbai Offshore, W.India Saurashtra Basin

Type Locality and Naming

SUBSURFACE: Its type section is in Well B-12-1, interval of 3024 to 3428 m. [Original Publication: Zutshi, P.L., Mittal, S.K., and Shah, L., 1993: Lithostratigraphy of Indian Petroliferous Basins, Document IV, Kutch Saurashtra Basin, KDMIPE, ONGC Publication, pp 1-50.]. Reference well: Well OS-2-G-1, interval of 1587 to 1700 m.

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


Lithology and Thickness

Calcareous shale/ claystone with a limestone marker bed at the bottom. It is 424 m thick in type section well in Saurashtra Basin; in well OS-2-G-1 it is 61m. In Mumbai Basin, it is described as clay-rich with occasional carbonate bands and a few sand stringers and argillaceous carbonates and shales. 303 m (thick) on Raju's chart. Indicated on regional stratigraphic column of Mumbai offshore of Dr. Raju as having a lower limestone and an upper claystone.


Lithology Pattern: 
Clayey limestone


Relationships and Distribution

Lower contact

In Mumbai offshore, indicated as overlying (unconformable) on the Panna Fm (partial inter-tonguing of this clay-rich facies with the sand-rich Panna Fm. In Saurashtra Basin, lower boundary is unconformable with the Jafarabad Fm (Jafrabad Fm)

Upper contact

Indicated as underlying Heera Fm, Diu Fm, or Pipavav Fm, depending on position within basin.

Regional extent

Saurashtra Basin continuing to Mumbai offshore


GeoJSON

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Fossils

Fasciolites- Lokhartia alvelata- Nummulites diokartae, N. burdigalensis- Lokhartia hunti pustulosa, O. beckmanni, Discorbinus- Discocyclina, Globigerinatheka kugleri- S. frontosa- boweri.


Age 

NDRDGH.gov Mumbai stratigraphic chart indicates early Middle Eocene

Age Span: 

    Beginning stage: 
Lutetian

    Fraction up in beginning stage: 
0.2

    Beginning date (Ma): 
46.66

    Ending stage: 
Lutetian

    Fraction up in the ending stage: 
0.8

    Ending date (Ma):  
42.44

Depositional setting

An inner-middle neritic environment of deposition is inferred for the formation.


Depositional pattern:  


Additional Information


Compiler:  

D.S.N Raju (Saurashtra basin); NDRDGH.gov Mumbai stratigraphic chart