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me Secondary Structures in the Upper Gondwana Sediments near Ongur
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alluvium appears aquifer associated banded basin beds belt Bengal Bihar block bodies boreholes changes clay coal seams collected colour concentration consists contain curves deposits depth described detailed district drilling electrical logging epeirogeny evidence faults feet field Figured foraminifera formation fossil further G.S.I. Type Geol Geological Geological Survey grains hematite hills increase India indicate iron iron-ore Jones known Latham Length lignite limestones lower Madhya Pradesh Madras mainly massive material miles mineral nature Neyveli Nummulitic observed occurs origin ostracoda Plate Pleistocene points possible present quartz quartzites Range recent recorded REFERENCES region represent resistivity rise river rocks sand sandstones sediments seen shales side South species specimens stage structure suggest surface Surv Survey of India temperature Tertiary thickness tion total dissolved solids Upper West zone