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<br />30 <br /> <br />. <br /> <br />Pleistocene -- the earlier of two epochs comprised ,in the <br />Quaternary period of geologic time; the great ice ages. <br /> <br />. <br /> <br />protohistoric alluvium -- deposits underlying the modern flood <br />, plains. <br /> <br />roughness coefficient (n),-- a measure of the obstructions to <br />flow in a channel, 0 such as size and shape of bed -material, <br />sinuosity, irregularities in ,channel section, etc. <br /> <br />sandstone ,-- a sedimentary rock composed predominantly of <br />quartz grains. <br /> <br />shale --a laminated sedimentary rock in which the constituent <br />particles are dominantly clay size, that is less than <br />1/256 nun diameter. <br /> <br />slope (S) -- gradient, drop in elevation between two points, <br /> <br />stereo-air photography ~- pho'tographs taken from airplanes from <br />slightly different angles, producing a three-dimensional <br />effect. <br /> <br />water table -- the level below which the pore s~ace is saturated. <br /> <br />. <br /> <br />. <br /> <br />, <br />