LOCATION PEDEE IDEstablished Series
TAXONOMIC CLASS: Clayey-skeletal, isotic, frigid Vitrandic Palexeralfs
TYPICAL PEDON: Pedee silt loam, forested. (Colors are for dry soil unless otherwise noted.)
A11--0 to 3 inches; dark grayish brown (10YR 4/2) silt loam, very dark brown (10YR 2/2) moist; weak thin platy parting to moderate very fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine, fine, medium and coarse roots; many very fine and fine interstitial pores; medium acid (pH 5.9); clear wavy boundary. (3 to 6 inches thick)
A12--3 to 10 inches; dark grayish brown (10YR 4/2) silt loam, very dark brown (10YR 3/2) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine, fine, medium and coarse roots; many very fine and fine interstitial pores; medium acid (pH 5.7); clear wavy boundary. (7 to 10 inches thick)
B2--10 to 19 inches; brown (10YR 5/3) gravelly silt loam, dark brown (10YR 4/3) moist; weak medium prismatic parting to moderate medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; many very fine and fine interstitial pores; few thin clay films on faces of peds and in pores; 30 percent gravel; strongly acid (pH 5.5); abrupt wavy boundary. (9 to 12 inches thick)
A'2--19 to 22 inches; very pale brown (10YR 7/3) very gravelly silt loam, dark brown (10YR 4/3) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; few very fine and fine interstitial pores; 36 percent gravel; strongly acid (pH 5.5); abrupt wavy boundary. (2 to 4 inches thick)
B'21t--22 to 31 inches; brown (7.5YR 5/4) very gravelly clay, dark brown (7.5YR 4/4) moist; moderate coarse columnar parting to moderate coarse angular blocky structure; extremely hard, very firm, very sticky and very plastic; few very fine and fine roots; few very fine pores; thick continuous clay films on faces of peds; 40 percent gravel; very strongly acid (pH 4.8); clear wavy boundary. (9 to 12 inches thick)
B'22t--31 to 41 inches; reddish brown (5YR 4/4) very gravelly loam, yellowish red (5YR 5/6) moist; massive; extremely hard, very firm, very sticky and very plastic; few very fine and fine roots; many very fine and fine pores; continuous moderately thick oriented clay occurring as bridges holding mineral grains together; 40 percent gravel; strongly acid (pH 5.4); clear wavy boundary. (9 to 11 inches thick)
B'3t--41 to 60 inches; pink (7.5YR 7/4) very gravelly loam, brown (7.5YR 5/4) moist; massive; extremely hard, extremely firm, very sticky and very plastic; many very fine and fine pores; continuous moderately thick oriented clay occurring as bridges holding mineral grains together; 65 percent gravel; neutral (pH 6.7).
TYPE LOCATION: Benewah County, Idaho; NE corner of sec. 16, T.44N., R.4W.; 3 percent slope.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 48 degrees to 50 degrees F. The solum is more than 60 inches thick. Coarse fragments in the control section range from 35 to 60 percent.
The Ap or A1 horizon has hue of 10YR or 7.5YR, value of 4 or 5 dry, 2 or 3 moist, and chroma of 2 or 3 dry or moist. Base saturation is 42 to 48 percent.
The B2 horizon has hue of 10YR or 7.5YR, value of 4 or 5 dry, 3 or 4 moist, and chroma of 3 or 4.
The A'2 horizon has hue of 7.5YR or 10YR, value of 6 or 7 dry, and 4 or 5 moist.
The B't horizon has hue of 7.5YR, 5YR, or 2.5YR, value of 6 or 7 dry, 4 or 5 moist, and chroma of 6 through 8. Clay films are thin to thick. The soil is strongly acid in some part of B'2t horizon. Base saturation is more than 75 percent in the B'22t and B'3t horizons.
COMPETING SERIES: These are the Worley soils. They have less than 35 percent coarse fragments in the control section.
GEOGRAPHIC SETTING: The soils are on dissected terraces. Slopes range from 3 to 35 percent. The soils formed in colluvium from metasedimentary rocks of the Belt series with silty loess sediments in the upper part of the profile. Elevation is from 2,500 to 3,200 feet. The mean annual precipitation is 24 to 27 inches, including 4 to 6 feet of snowfall. The summers are dry. The frost-free period is 100 to 130 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Tekoa, Tensed and McCrosket soils. Tekoa and McCrosket soils are loamy-skeletal. Tensed soils have a mollic epipedon.
DRAINAGE AND PERMEABILITY: Moderately well drained; medium runoff; very slow permeability.
USE AND VEGETATION: Used mainly for woodland with some areas of cropland. The primary crops are small grains, hay and pasture. The natural overstory vegetation is ponderosa pine and Douglas-fir. Understory is snowberry, white spirea, and rose species.
DISTRIBUTION AND EXTENT: Forested mountainous areas in Benewah County, Idaho. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Benewah County, Idaho, 1975.
ADDITIONAL DATA: University of Idaho 72IDA 0523.