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Custom Soil Resource Report <br /> Silica-sesquioxide ratio <br /> The ratio of the number of molecules of silica to the number of molecules of <br /> alumina and iron oxide. The more highly weathered soils or their clay fractions <br /> in warm-temperate, humid regions, and especially those in the tropics, generally <br /> have a low ratio. <br /> Silt <br /> As a soil separate, individual mineral particles that range in diameter from the <br /> upper limit of clay (0.002 millimeter)to the lower limit of very fine sand (0.05 <br /> millimeter). As a soil textural class, soil that is 80 percent or more silt and less <br /> than 12 percent clay. <br /> Siltstone <br /> An indurated silt having the texture and composition of shale but lacking its fine <br /> lamination or fissility; a massive mudstone in which silt predominates over clay. <br /> Similar soils <br /> Soils that share limits of diagnostic criteria, behave and perform in a similar <br /> manner, and have similar conservation needs or management requirements for <br /> the major land uses in the survey area. <br /> Sinkhole (map symbol) <br /> A closed, circular or elliptical depression, commonly funnel shaped, <br /> characterized by subsurface drainage and formed either by dissolution of the <br /> surface of underlying bedrock(e.g., limestone, gypsum, or salt) or by collapse <br /> of underlying caves within bedrock. Complexes of sinkholes in carbonate-rock <br /> terrain are the main components of karst topography. <br /> Site index <br /> A designation of the quality of a forest site based on the height of the dominant <br /> stand at an arbitrarily chosen age. For example, if the average height attained <br /> by dominant and codominant trees in a fully stocked stand at the age of 50 <br /> years is 75 feet, the site index is 75. <br /> Slickensides (pedogenic) <br /> Grooved, striated, and/or glossy (shiny) slip faces on structural peds, such as <br /> wedges; produced by shrink-swell processes, most commonly in soils that have <br /> a high content of expansive clays. <br /> Slide or slip (map symbol) <br /> A prominent landform scar or ridge caused by fairly recent mass movement or <br /> descent of earthy material resulting from failure of earth or rock under shear <br /> stress along one or several surfaces. <br /> Slope <br /> The inclination of the land surface from the horizontal. Percentage of slope is <br /> the vertical distance divided by horizontal distance, then multiplied by 100. <br /> Thus, a slope of 20 percent is a drop of 20 feet in 100 feet of horizontal <br /> distance. <br /> 65 <br />