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Custom Soil Resource Report <br />Genesis, soil <br />The mode of origin of the soil. Refers especially to the processes or soil -forming <br />factors responsible for the formation of the solum, or true soil, from the <br />unconsolidated parent material. <br />Gilgai <br />Commonly, a succession of microbasins and microknolls in nearly level areas or <br />of microvalleys and microridges parallel with the slope. Typically, the microrelief <br />of clayey soils that shrink and swell considerably with changes in moisture content. <br />Glaciofluvial deposits <br />Material moved by glaciers and subsequently sorted and deposited by streams <br />flowing from the melting ice. The deposits are stratified and occur in the form of <br />outwash plains, valley trains, deltas, kames, eskers, and kame terraces. <br />Glaciolacustrine deposits <br />Material ranging from fine clay to sand derived from glaciers and deposited in <br />glacial lakes mainly by glacial meltwater. Many deposits are bedded or laminated. <br />Gleyed soil <br />Soil that formed under poor drainage, resulting in the reduction of iron and other <br />elements in the profile and in gray colors. <br />Graded striperopping <br />Growing crops in strips that grade toward a protected waterway. <br />Grassed waterway <br />A natural or constructed waterway, typically broad and shallow, seeded to grass <br />as protection against erosion. Conducts surface water away from cropland. <br />Gravel <br />Rounded or angular fragments of rock as much as 3 inches (2 millimeters to 7.6 <br />centimeters) in diameter. An individual piece is a pebble. <br />Gravel pit (map symbol) <br />An open excavation from which soil and underlying material have been removed <br />and used, without crushing, as a source of sand or gravel. <br />Gravelly soil material <br />Material that has 15 to 35 percent, by volume, rounded or angular rock fragments, <br />not prominently flattened, as much as 3 inches (7.6 centimeters) in diameter. <br />Gravelly spot (map symbol) <br />A spot where the surface layer has more than 35 percent, by volume, rock <br />fragments that are mostly less than 3 inches in diameter in an area that has less <br />than 15 percent rock fragments. <br />33 <br />