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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science) 
		 
			 
			 
			 
			 
			 
			 
			 
			 
			 
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Asif ali![best-answer]() 
			
C. Clay+sandstone gives less porosity (porous clay filled between sand causes porosity of the rock lesser than actual clay porosity) and permeability moderate . so less porous and less permeable are aquitard.