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The Lower Vindhyan (Semri) Group is largely composed of thick unmetamorphosed and undeformed sedimentary sequences of Late Palaeoproterozoic age. A detailed geochemical and palynological study has been carried out for the black shale lithounits of the Arangi and Kajrahat Limestone formations exposed near Chopan town, Sonbhadra district, Uttar Pradesh for evaluating their hydrocarbon potential and...