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GEOLOGIC TERMINOLOGY <br />The geologic description indicates the apparent depositional origin or strati - <br />graphic name. Geologic <br />identification is interpretive and subject to error. <br />General categories <br />of geologic deposits and descriptive information is as <br />follows: <br />BEDROCK <br />Often a hard, dense, consolidated rock formation. Can <br />also be soft, compressible, or unconsolidated. <br />COARSE ALLUVIUM <br />Sandy (and gravelly) soil. Stratified. Deposited from <br />fast moving waters in streams, rivers and deltas. <br />FILL <br />CONTROLLED: Compact, uniform material; inorganic; no debris. <br />UNCONTROLLED: Loose, non-uniform; organic materials; debris. <br />FINE ALLUVIUM <br />Clayey and/or silty soil. Stratified. Deposited from <br />slow moving waters in streams, rivers, and lakes. <br />GLACIAL TILL <br />Inorganic soil. Normally contains a wide range of grain <br />sizes, from clay through boulders. Non -stratified. <br />Deposited directly from glaciers. <br />LAKE DEPOSIT <br />Clayey soil. Laminated. Deposited from very slow moving <br />waters in ponds and lakes. <br />LOESS <br />Silty soil. Non -stratified. Upper layer. Deposited from <br />wind. <br />OUTWASH <br />Coarse alluvium deposited from glacial meltwaters. <br />SLOPEWASH <br />Organic and/or inorganic material. Washed from slopes <br />and deposited in depressions. <br />SWAMP DEPOSIT <br />I it, ii.—k, and mar.. Formed through accumulation of <br />r•:�nic material under water. <br />TOPSOIL <br />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 <br />Dominantly gravel, boulders and rock slabs. Deposited <br />from gravity flow down hills or cliffs. <br />WEATHERED BEDROCK <br />Bedrock which has been substantially weathered through <br />disintegration or decomposition. <br />WEATHERED SOIL <br />Texture and composition is transitional between topsoil <br />and underlying non -weathered soil. <br />-Geolechnical Engineering Cofporalion <br />