A study of samples of sand collected from the James river of Virginia between Clifton Forge, Alleghany County, and Smithfield, Isle of Wight County, shows a distinct correlation between stream sediments and country rock of the adjacent drainage area. There is a marked difference in the mineral content of the sands derived from the rocks of the four principal physiographic provinces-- viz., the sedimentary rocks of the Valley and Ridge, the igneous rocks of the Blue Ridge, the metamorphic rocks of the Piedmont, and the sedimentary rocks of the Coastal Plain.

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