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The Geology of the Penner Gorge Section and Petrography and Genesis of the Rock
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alluvium appears aquifers associated banded basic basin beds belt Bengal Bihar block body boreholes buff coloured cause changes clay coal seams collected colour comparable concentration consists contain curves deposits depth described detailed direction district drilling east electrical logging epeirogeny evidence faults feet field foraminifera formation fossil further Geol geological Geological Survey grains ground hematite hills increase indicate iron iron-ore Jones known length less lignite limestones lower Madras mainly massive material miles mineral nature Nummulitic observed occur origin places Plate Pleistocene possible present quartz quartzites Range recent recorded REFERENCES region resistivity Rhamphorhynchus rise river rocks sand sandstones sediments seen sericite shales side South species specimens stage structure suggested surface Surv Survey of India temperature Tertiary thickness tion total dissolved solids Type Upper West zone