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Custom Soil Resource Report <br /> An identifying symbol precedes the map unit name in the map unit descriptions. Each <br /> description includes general facts about the unit and gives important soil properties <br /> and qualities. <br /> Soils that have profiles that are almost alike make up a soil series. Except for <br /> differences in texture of the surface layer, all the soils of a series have major horizons <br /> that are similar in composition, thickness, and arrangement. <br /> Soils of one series can differ in texture of the surface layer, slope, stoniness, salinity, <br /> degree of erosion, and other characteristics that affect their use. On the basis of such <br /> differences, a soil series is divided into soil phases. Most of the areas shown on the <br /> detailed soil maps are phases of soil series. The name of a soil phase commonly <br /> indicates a feature that affects use or management. For example, Alpha silt loam, 0 <br /> to 2 percent slopes, is a phase of the Alpha series. <br /> Some map units are made up of two or more major soils or miscellaneous areas. <br /> These map units are complexes, associations, or undifferentiated groups. <br /> A complex consists of two or more soils or miscellaneous areas in such an intricate <br /> pattern or in such small areas that they cannot be shown separately on the maps. The <br /> pattern and proportion of the soils or miscellaneous areas are somewhat similar in all <br /> areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example. <br /> An association is made up of two or more geographically associated soils or <br /> miscellaneous areas that are shown as one unit on the maps. Because of present or <br /> anticipated uses of the map units in the survey area, it was not considered practical <br /> or necessary to map the soils or miscellaneous areas separately. The pattern and <br /> relative proportion of the soils or miscellaneous areas are somewhat similar. Alpha- <br /> Beta association, 0 to 2 percent slopes, is an example. <br /> An undifferentiated group is made up of two or more soils or miscellaneous areas that <br /> could be mapped individually but are mapped as one unit because similar <br /> interpretations can be made for use and management. The pattern and proportion of <br /> the soils or miscellaneous areas in a mapped area are not uniform. An area can be <br /> made up of only one of the major soils or miscellaneous areas, or it can be made up <br /> of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example. <br /> Some surveys include miscellaneous areas. Such areas have little or no soil material <br /> and support little or no vegetation. Rock outcrop is an example. <br /> 11 <br />