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GEOLOGIC TERMINOLOGY <br />The geologic description indicates the apparent depositional origin or <br />stratigraphic name. Geologic identification is interpretive and suhject <br />to error. <br />General categories of geologic deposits, and descriptive information is <br />as follows: <br />ALLUVIUM COARSE ALLUVIUM: Sandy (and gravelly). Stratified. <br />Deposited from fast moving waters <br />in streams and rivers. (Includes <br />glacial outwash.) <br />FINE ALLUVIUM: Clayey and/or silty. Stratified. <br />Deposited from slow moving waters <br />in streams, rivers, lakes, and ponds. <br />BEDROCK Wide range of characteristics: from hard, dense, <br />consolidated rock; to soft, compressible, and uncon- <br />solidated soil -like material. <br />FILL CONTROLLED: Compact, uniform material; inorganic; <br />no debris. <br />UNCONTROLLED: Loose or variable density. Mixture <br />of soil types. Often contains debris <br />and organic material. <br />TILL Normally contains a wide range of grain sizes, from <br />boulders through clay. Usually non -stratified. <br />Deposited directly from glaciers. <br />LOESS Silty. Non -stratified. Upper layer. Deposited from <br />wind. <br />SLOPE WASH Organic and/or inorganic material washed from slopes <br />and redeposited. <br />SWAMP DEPOSITS Peat, muck, and marl, and organic soil. Formed through <br />accumulation of organic material under water. <br />TOPSOIL Contains both inorganic and organic material. Upper, <br />black layer of soil. Formed by weathering of inorganic <br />soil and accumulation of organic material. <br />TUMBLEROCK Dominantly gravel, boulders and rock slabs. Deposited <br />from gravity flow down hills or cliffs. <br />WEATHERED BEDROCK Bedrock which has been substantially weathered through <br />disintegration or decomposition. Texture and composi- <br />tion grades into he.drock. <br />WEATHERED SOIL Texture. compositi-)n, and position is intermediate <br />between topsoil ann non -weathered soil. <br />DNS• <br />l„..hw.wlntM <br />� "� VMW.. r.. •. ins <br />