Palaeoenvironment and Stratigraphic Position of Green Sandstone (Lameta: Late Cretaceous) Jabalpur Area

Abstract

Green Sandstone (Green Sand) of Lameta sediments, in Jabalpur area, makes a conspicuous basal lithounit of the succession. It is made up of clean sand without any shale intercalations, and ranges in grain size from medium to fine sand. Largescale cross-bedding in the form of large festoons is the most dominant structure, showing mostly a bipolar current pattern, where one direction is more prominent. The sandstone also exhibits branched Thalassinoides-type burrows. The Green Sandstone represents deposit of an estuarine channel with tidal influences exclusively by marine processes. The prominent southerly palaeocurrent direction at Chui Hill is interpreted as local ebb-current direction.