Rewa Fm

Middle Formation in the Upper Vindhyan Gr.

Synonym: Rewa Gr (used as Group by Basu- and Chakrabarti, 2020; but as Formation by Sarkar and Banerjee, 2020, which is used here)

In WEST -- Upward succession of Panna Shale Fm, Indergarh Sandstone (sometimes called the Lower Rewa Sandstone), Jiri Shale and Govindgarh Sandstone (sometimes called the Upper Rewa Sandstone). Panna Shale consists of ca. 120 m of thinly laminated greenish-grey, khaki, brown and chocolate colored shales. The Lower Rewa Sandstone is a 33-m-thick "glauconite-bearing medium- to coarse-grained greenish-grey brown-weathering massive sandstone … with thin bands of diamond-bearing conglomerate recorded in the upper part. … The Jhiri Shale is made up of red,

reddish-brown to greenish-yellow shales and minor fine- and medium-grained sandstone … characterized by flaser bedding. …The Upper Rewa Sandstone … comprises pink, light pink and

light yellowish-brown and yellowish-white fine- to medium-grained massive sandstone. It shows

profuse development of trough and planar mega cross-bedding." (extracts from Kumar, 2012).

In EAST – Upward succession of Rewa Shale and Rewa Sandstone (in Basu and Chakrabarti, 2020) or given the same terminology as in the WEST basin. In the former terminology, the Rewa Shale in some locations has a lensoid sandstone in the middle, which others had correlated to the Indergarh Sandstone in the West. "A diamondiferous conglomerate occurs at the base of the Rewa Shale.", and the shelf succession of the composite Rewa Shale " depicts stacking of shoaling-upward facies couplets separated from each other by thin, well-sorted granular lags. The Rewa Shale passes upwards into the Rewa Sandstone, which has a coarsening-upward trend. The Rewa Sandstone of quartz arenite exhibits shallow marine-tidal deposits grading upwards into fluvial/eolian deposits."

Marginal marine with intervals of tidal and beach sedimentary structures.