Saradih Limestone Fm

Upper formation (4 of 5) of Raipur Gr.

Synomym or equivalent: Chandi Limestone Fm

Limestone, with slate, chert and dolomite; and stromatolite bearing (Fig – Image F). Small isolated bioherms are "profusely developed in the Saradih/Chandi Limestone". The carbonates are mostly micrite with minor dolomitization at places. Early lithified intrabasinal lime clasts occur as a

subordinate constituent, and calcareous peloids occur in a very minor amount.

[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 - 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)]

Carbonate platform. Table 3 in Saha et al. (2016) also indicates tidal shelf to minor fluvial (lower portion?)