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ESTIMATION Or HYPOTHETICAL ION CONCENTRATIONS FROM RESISTIVITY
Map showing the Geology in and adjacent to the Gangetic plain and
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alluvium appears aquifers associated banded basic basin beds belt Bengal Bihar block bodies boreholes buff coloured cause changes clay coal seams colour concentration consists contain curves deposits depth described detailed direction district drilling east electrical logging epeirogeny evidence faults feet field foraminifera formation Geol Geological Survey given grains hematite hematite-quartzite hills increase indicate iron iron-ore Jones known less lignite limestones lower Madhya Pradesh Madras mainly massive material miles mineral nature Nummulitic observed occur origin Orissa places Plate Pleistocene possible present Punjab quartz quartzites range Ratanpur recent recorded REFERENCES region resistivity Rhamphorhynchus rise river rocks samples sand sandstones sediments seen sericite shales side silica South species specimens structure suggested surface Surv Survey of India temperature thickness tion total dissolved solids Type Upper West zone