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Gomarda Formation
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Gomarda Fm base reconstruction

Gomarda Fm

Period: 
Ectasian

Age Interval: 
early Ectasian


Province: 
Proterozoic S.India Chattisgarh Basin

Type Locality and Naming

Middle formation (2 of 3) of Chandarpur Gr

Synonym or coeval: Chaporadih Fm


Lithology and Thickness

Clayey sandstone. A very thick sand-mud heterolithic and shale succession (Fig. – image B)

[Figure: Chattisgarh basin Field photographs illustrating lithology and sedimentary structures. (A) Lohardih Fm - Poorly sorted, matrix supported ungraded, conglomerate. Note the occurrence of large fairly rounded clast with relatively smaller angular clasts. (B) Gomarda Fm (Chaporadih Fm) - Sand-mud heterolithic rocks. Note the successive fining upward cycles marking cyclic change in depositional environment. (C) Kansapathar Sandstone Fm - Cross-stratified sandstone. (D) Sarangarh Limestone Fm (Charmuria Limestone Fm) - Limestone-marl rhythmite. Bed thickness: 2-10 cm and separated by mm thin marl layer. (E) Gunderdehi Shale Fm - Upper part of with stromatolite bioherms appearing as isolated pockets. (F) Saradih Limestone Fm (Chandi Limestone Fm) - Stromatolitic limestone. Note that stromatolite columns are nonbranching and branching with two to six branches. Column height 5-15, width 1-3 cm. (from Saha et al., 2016)]


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

Underlain by Lohardih Fm

Upper contact

Regional extent


GeoJSON

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Fossils


Age 


Age Span: 

    Beginning stage: 
Ectasian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
1,400.00

    Ending stage: 
Ectasian

    Fraction up in the ending stage: 
0.25

    Ending date (Ma):  
1,350.00

Depositional setting

Nearshore tidal to subtidal shelf


Depositional pattern:  


Additional Information


Compiler:  

From: Saha D. (Dilip), Patranabis-Deb, S., and Colllins, A.S. (2016) Proterozoic stratigraphy of southern Indian cratons and global context. In: Stratigraphy & Timescales, 1: 1-59.