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Tharad Formation
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Tharad Fm base reconstruction

Tharad Fm

Period: 
Paleogene

Age Interval: 
Lower to Middle Eocene


Province: 
W.India Cambay Basin

Type Locality and Naming

SUBSURFACE: Well Tharad-1, (depth interval 961-1546m). It is of 585 m thickness. [Original Publication: Chandra, P.K. and Chowdhary, L.R. (1969) Stratigraphy of the Cambay Basin, ONGC Bulletin, Vol 6 (2), pp: 202-203.] Reference well: Sanchaor – 1 (depth interval 1540 – 2187 m), its thickness is of 647 m.

Synonyms: Sugary sandstone and cyclic sediments succeeding the Cambay Fm / Olpad Fm is Tharad Formation.


Lithology and Thickness

Sandy claystone and coal. The type section comprises of sandstone, shale and thick coal beds. Sandstone is grey, pink, coarse to medium grained. The formation in Sanchaor-1 is comprises of sand, shale and coal alternation.

[Figure 1: Rock units and their reference sections in Cambay Basin (after Pandey et al., 1993)]

[Figure 2: Generalized stratigraphy of the Cambay Basin. (from Jaiswal and Bhattacharya, 2018, J.EarthSyst.Sci., 127:65)]


Lithology Pattern: 
Sandy claystone


Relationships and Distribution

Lower contact

Unconformable with Olpad Fm

Upper contact

Conforamble with Tarapur Fm.

Regional extent

The formation extends from Sanchor in the north to Patan depression upto Khari river in the south and west of Mehsana Horst in Khambel-Becharaji area.


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[71.47,24.96],[72.04,25.03],[72.95,23.89],[73.42,22.76],[73.38,22.06],[72.46,21.01],[71.47,24.96]]]]}}

Fossils

The formation is poorly fossiliferous, at places solitary forms of bryozoa and shell fragments along with sideritic globular bodies have been recorded (Sharma et al., 1990, unpublished report on well Tharad-P).


Age 

A Lower to Middle Eocene age is assigned based on palynofossils evidences.

Age Span: 

    Beginning stage: 
Lutetian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
48.07

    Ending stage: 
Priabonian

    Fraction up in the ending stage: 
0.1

    Ending date (Ma):  
37.33

Depositional setting


Depositional pattern:  

Additional Information


Compiler:  

D.S.N Raju