LOCATION LITTLE WOOD IDEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Ultic Argixerolls
TYPICAL PEDON: Little Wood very gravelly loam, alfalfa. (Colors are for dry soil unless otherwise noted.)
Ap--0 to 8 inches; grayish brown (10YR 5/2) very gravelly loam, very dark grayish brown (10YR 3/2) moist; moderate fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many fine and medium roots; many fine irregular pores; slightly acid (pH 6.4); clear smooth boundary. (7 to 9 inches thick)
A--8 to 14 inches; grayish brown (10YR 5/2) very gravelly loam, very dark grayish brown (10YR 3/2) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many fine and medium roots; many fine tubular pores; slightly acid (pH 6.4); clear wavy boundary. (2 to 8 inches thick)
Bt1--14 to 19 inches; brown (10YR 5/3) very gravelly sandy clay loam, dark brown (10YR 3/3) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, sticky and slightly plastic; common fine and medium roots; many fine tubular pores; few faint clay films on vertical faces of peds and in pores; slightly acid (pH 6.4); clear wavy boundary. (2 to 7 inches thick)
Bt2--19 to 30 inches; pale brown (10YR 6/3) very gravelly sandy clay loam, brown (10YR 4/3) moist; moderate medium subangular blocky structure; slightly hard, friable, sticky and plastic; common fine and medium roots; many fine tubular pores; few faint clay films on faces of peds and in pores; neutral (pH 6.6); clear wavy boundary. (8 to 13 inches thick)
C1--30 to 46 inches; pale brown (10YR 6/3) very gravelly loamy coarse sand, brown (10YR 4/3) moist; massive; soft, very friable, nonsticky and nonplastic; many fine and medium roots; many fine tubular pores; 50 percent pebbles and 10 percent cobbles; neutral (pH 7.0); gradual wavy boundary. (12 to 20 inches thick)
C2--46 to 60 inches; extremely gravelly coarse sand; single grain; loose; few fine roots; neutral (pH 7.0).
TYPE LOCATION: Camas County, Idaho; about 3 miles east and 3 miles north of Fairfield; 150 feet west and 450 feet north of the southeast corner of sec. 25, T. 1 N., R. 14 E.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 42 to 47 degrees F.
Average summer soil temperature - 60 to 65 degrees F.
Mollic epipedon thickness - 10 to 19 inches
Depth to sandy-skeletal layer and base of the argillic - 21 to 34 inches
Reaction - moderately acid to neutral
Base saturation - 50 to 75 percent
A horizon
Value - 3 through 5 dry, 2 or 3 moist
Chroma - 1 through 3 dry or moist
Bt horizon
Hue - 7.5YR or 10YR
Value - 4 through 6 dry, 3 to 5 moist
Chroma - 2 through 6 dry or moist
Texture - GRV-SCL, GRV-CL, CBX-SCL, GRV-L
Clay percentage - average 20 to 35 percent
Coarse fragment content - 35 to 55 percent pebbles, 5 to 40 percent cobbles, 35 to 85 percent total
C horizon
Texture - GRX-LCOS, GRX-COS, CBX-LCOS, or CBX-COS
Rock fragment content - 60 to 80 percent
In some pedons this is a Bkq horizon with lime and silica coatings on undersides of rock fragments
Bq horizons are present in some pedons
COMPETING SERIES: These are the Apmat, Durst, Fergie, Fraval, Henhoit, Kalo, Klicker, Klickson, Morningstar, Mulshoe, Sapkin, and Sattley series. Apmat soils have 10 to 18 percent clay in the argillic and occur in a 20 to 35 inch precipitation. Durst, Fraval, Kalo, Klicker, Mulshoe, and Sapkin soils have a lithic or paralithic contact at depths of 20 to 40 inches. Fergie soils have bedrock at 50 to 60 inches. Henhoit and Klickson are deeper than 34 inches to the base of the argillic. In addition, Henhoit has a base saturation of more than 75 in some part of the upper 30 inches. Klickson soils have an O horizon. Morningstar soils have O horizons and lack sandy-skeletal material immediately below the argillic horizon. Sattley soils lack a sandy-skeletal layer immediately below the argillic above 40 inches and are dry 120 consecutive days during summer and fall.
GEOGRAPHIC SETTING: Little Wood soils are on fan terraces, stream terraces, and dissected alluvial terraces. Slopes range from 0 to 30 percent. The soil formed in loess, alluvium, and residuum from mixed sources. Elevation ranges from 4,700 to 6,200 feet. The annual precipitation is 12 to 18 inches, most of which falls as snow and early spring rain. The average annual air temperature is about 40 to 46 degrees F. The frost-free season is 60 to 110 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Adamson, Balaam, Bringmee, Bruneel, Carey Lake, Rands, Simonton, and Vodermaier soils. Adamson, Balaam, Bruneel, and Vodermaier soils lack an argillic horizon. Bringmee, Carey Lake, Rands, and Simonton soils have less than 35 percent coarse fragments in the control section. Adamson and Balaam soils occur on stream terraces. Bruneel soils occur on flood plains. Bringmee, Carey Lake, Rands, Simonton, and Vodermaier soils occur on fan terraces.
DRAINAGE AND PERMEABILITY: Well drained; slow runoff; moderate permeability in the subsoil and very rapid below this depth.
USE AND VEGETATION: Dry cropland, irrigated cropland, rangeland, and housing sites. Alfalfa hay, pasture, and small grains are the principle crops. Vegetation is bluebunch wheatgrass, Idaho fescue, Sandberg bluegrass, needlegrasses, mountain big sagebrush, and basin big sagebrush.
DISTRIBUTION AND EXTENT: Little Wood soils are moderately extensive in south-central Idaho.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Camas County, Idaho, 1977.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from the surface of the soil to a depth of approximately 14 inches (Ap and A horizons)
Argillic horizon - the zone from approximately 14 to 30 inches (Bt1 and Bt2 horizons)