Kansapathar Sandstone Fm

Upper formation (3 of 3) of Chandarpur Gr

Sandstsone. Quartz arenite and feldspathic sandstone -- a sheet of texturally and compositionally mature arenite (Fig. image C), with minor arkose/subarkose.

[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)]

Shelf sandstone bar and interbar, subtidal to intertidal. The Kansapathar Sandstone Fm was deposited in a wide tidal shelf, and represents the transition from the unstable rifting phase to the stable subsidence phase of the basin evolution.