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Table I-2 <br /> III, Map Unit Description-San Miguel Area,Colorado,Parts of Dolores,Montrose, <br /> and San Miguel Counties <br /> Soils that have profiles that are almost alike make up a soil series.All the soils of <br /> . a series have major horizons that are similar in composition,thickness,and <br /> arrangement.Soils of a given series can differ in texture of the surface layer,slope, • <br /> stoniness,salinity,degree of erosion,and other characteristics that affect their use. <br /> . On the basis of such differences, a soil series is divided into soil phases. Most of <br /> the areas shown on the detailed soil maps are phases of soil series.The name of <br /> a soil phase commonly indicates a feature that affects use or management. For <br /> example,Alpha silt loam, 0 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. <br /> The pattern and proportion of the soils or miscellaneous areas are somewhat similar <br /> in all 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 <br /> or anticipated uses of the map units in the survey area,it was not considered <br /> practical or necessary to map the soils or miscellaneous areas separately.The <br /> pattern and relative proportion of the soils or miscellaneous areas are somewhat • <br /> similar.Alpha-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 <br /> that 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 <br /> of the soils or miscellaneous areas in a mapped area are not uniform.An area can <br /> be made up of only one of the major soils or miscellaneous areas,or it can be made . <br /> up 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 <br /> material and support little or no vegetation.Rock outcrop is an example. . <br /> Additional information about the map units described in this report is available in <br /> other soil reports,which give properties of the soils and the limitations,capabilities, <br /> and potentials for many uses.Also,the narratives that accompany the soil reports <br /> define some of the properties included in the map unit descriptions. <br /> Report—Map Unit Description <br /> • <br /> San Miguel Area, Colorado, Parts of Dolores, Montrose, <br /> and San Miguel Counties <br /> 23—Bodot, dry-Ustic Torriorthents complex,5 to 50 percent <br /> slopes <br /> Map Unit Setting <br /> Elevation:5,400 to 6,800 feet <br /> Mean annual precipitation: 10 to 12 inches <br /> Mean annual air temperature:46 to 48 degrees F <br /> Frost-free period.' 110 to 130 days <br /> dill <br /> US1 Natural Resources Web Soil Survey 5/4/2011 <br /> Conservation Service National Cooperative Soil Survey Page 2 of 9 <br />