Untitled

Forested, Gray Wooded, Acid Brown Wooded, and Podzol soil groups . Theyounger soil-forming materials, composed of recent overlay on alluvialfans, river and stream, organic and beach deposits were classed asRegosol, Gleysol, Brown Wooded, and Organic soils .Table 3 shows the relationship of the soil-forming deposits tosoil subgroups and soil series . In the mapped area the soils developedunder a range of precipitation, which governs the amount of developmentand the density of vegetative growth . The classification grades fromRegosols (least weathered) to Podzols (most weathered) . The groundwatersoils are the Gleysol and Organic members .The basic mapping unit is the soil series . A soil series consistsof a group of related soils derived from similar parent material andhaving soil horizons similar in differentiating characteristics andarrangement in the soil profile, except for the texture at the surface .Areas having variable surface textures, but otherwise the same, aredistinguished as subdivisions of a soil series, and called soil types .A soil series having a surface texture that does not vary is also mappedas a soil type . Soil types are distinguished by the name of the series(e .g . Carlin), and the texture of the surface soil (e .g . silt loam), thefull name of the soil being Carlin silt loam . The series names areusually the names of lakes, creeks, railway sidings, villages, and otherestablished names in the localities in which the series was originallyidentified .A phase of a soil series may also be distinguished, particularlywhere this has significance to land use . Phases are based on variationsthat occur within a series, such as topography, depth of profile, stoniness,drainage, and others .In some cases it is not feasible to separate two or more series .Such areas are mapped as soil complexes . Where two or more soil serieshave been described separately in the report, the name of the complexconsists of the names of the series of which it is composed . Suchnames are hyphenated (e .g . Carlin-Tappen complex) . The name of theseries that occupies the major acreage comes first and the other namesfollow in order . Complexes of as many as four series are mapped,depending on the map scale and/or the intimacy with which the soils areintermingled .Soil series were assigned to subgroups according to the pedologicdevelopment that signifies their genetic relationships . These areshown in Table 3 . Descriptions of the main observable characteristicsof the subgroups head those of the soil series classed in each subgroup .