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Custom Soil Resource Report <br />observed, and consequently they are not mentioned in the descriptions, especially <br />where the pattern was so complex that it was impractical to make enough observations <br />to identify all the soils and miscellaneous areas on the landscape <br />The presence of minor components in a map unit in no way diminishes the usefulness <br />or accuracy of the data The objective of mapping is not to delineate pure taxonomic <br />classes but rather to separate the landscape into landforms or landform segments that <br />have similar use and management requirements The delineation of such segments <br />on the map provides sufficient information for the development of resource plans If <br />intensive use of small areas is planned however, onsite investigation is needed to <br />define and locate the soils and miscellaneous areas <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 senes have major honzons <br />that are similar in composition, thickness, and arrangement <br />Soils of one senes can differ in texture of the surface layer, slope, stoniness, salinity, <br />degree of erosion, and other charactenstics 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 senes 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 sods 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 matenal <br />and support little or no vegetation Rock outcrop is an example <br />11 <br />1 -12 <br />