LOCATION MINALOOSA IDEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Typic Dystroxerepts
TYPICAL PEDON: Minaloosa loam, forested. (Colors are for dry soil unless otherwise stated.)
Oi & Oe--0 to 0.5 inch; undecomposed and partially decomposed needles and twigs. (0 to 2 inches thick)
A--0.5 to 6 inches; brown (10YR 5/3) loam, dark brown (10YR 3/3) moist; moderate fine and very fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; many fine roots; many fine interstitial pores; 10 percent fine pebbles; moderately acid (pH 6.0); clear wavy boundary. (3 to 7 inches thick)
AB--6 to 12 inches; yellowish brown (10YR 5/4) gravelly loam, dark yellowish brown (10YR 4/4) moist; moderate fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many fine and common medium roots; many fine interstitial pores; 10 percent pebbles and 5 percent cobbles; moderately acid (pH 6.0); clear wavy boundary. (5 to 10 inches thick)
Bt1--12 to 22 inches; light yellowish brown (10YR 6/4) gravelly loam, brown (7.5YR 4/4) moist; moderate fine subangular blocky structure; hard, friable, slightly sticky and slightly plastic; many fine and common medium roots; many fine tubular pores; 25 percent pebbles and 5 percent cobbles; very few faint clay films; moderately acid (pH 5.6); gradual wavy boundary. (5 to 10 inches thick)
Bt2--22 to 34 inches; light yellowish brown (10YR 6/4) very gravelly loam, dark yellowish brown (10YR 4/4) moist; moderate fine subangular blocky structure; hard, friable, slightly sticky and slightly plastic; many fine and few medium roots; many fine tubular pores; 35 percent pebbles and 5 percent cobbles; very few faint clay films; moderately acid (pH 5.6); gradual wavy boundary. (10 to 30 inches thick)
C1--34 to 47 inches; very pale brown (10YR 7/3) very gravelly loam, yellowish brown (10YR 5/4) moist; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few fine and medium roots; many fine tubular pores; 50 percent pebbles and 10 percent cobbles; strongly acid (pH 5.4); gradual wavy boundary. (10 to 20 inches thick)
C2--47 to 65 inches; very pale brown (10YR 7/4) extremely gravelly loam, yellowish brown (10YR 5/6) moist; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common fine tubular pores; 70 percent gravel; strongly acid (pH 5.4).
TYPE LOCATION: Latah County, Idaho; about 1,850 feet west and 1,500 feet north of the southeast corner of sec. 18, T.43N., R.4W.
RANGE IN CHARACTERISTICS: Solum thickness is 20 to 40 inches. the mean annual soils temperature is 45 to 47 degrees F. and the mean summer soil temperature is 59 to 63 degrees F., if without an O horizon. The soils are usually moist but are dry between depths of 4 and 12 inches for 45 to 60 consecutive days in late summer. Between depths of 10 and 30 inches the base saturation (by NH4Oac) is 40 to 60 percent. The particle-size control section contains 35 to 60 percent rock fragments.
The A horizon has value of 5 or 6 and chroma of 3 or 4. It contains 0 to 15 percent pebbles.
The Bt horizon has hue of 7.5YR or 10YR. It has less than 1.2 times as much clay as the overlying eluvial horizon.
COMPETING SERIES: These are the Althouse, Beargulch, Hangtown, Icicle, Jayar, Notned, Smokey, and Standup series. Althouse soils have more than 60 percent rock fragments in the particle-size control section and have a paralithic contact at a depth of 40 to 60 inches. Beargulch soils are 40 to 60 inches deep to a lithic contact and are dry for about 75 to 90 consectutive days following summer solstice. Hangtown soils are 40 to 60 inches deep to a paralithic contact and are dry for about 90 consectutive days following summer solstice. Icicle soils are dry for about 75 to 90 consectutive days following summer solstice and are sandy loam in the fine-earth fraction. Jayar soils are 20 to 40 inches deep to a lithic contact. Notned soils are dry for about 90 consectutive days following summer solstice. Smokey soils are 20 to 40 inches deep to a paralithic contact and are dry for about 90 consectutive days following summer solstice. Standup soils are dry for about 60 to 75 consectutive days following summer solstice and the upper 3 to 7 inches of the pedon is dominated by volcanic ash in the fine earth fraction.
GEOGRAPHIC SETTING: The soils are in uplands and have slopes of 35 to 65 percent. Elevation is 2,700 to 4,500 feet. The soils formed in loess mixed with residuum and colluvium from metasedimentary rock. The mean annual precipitation is 26 to 30 inches. The frost-free period ranges from 100 to 120 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Farber and Huckleberry soils. Huckleberry soils are moderately deep and contain volcanic ash. Farber soils have mesic soil temperature regimes.
DRAINAGE AND PERMEABILITY: Well drained; very rapid runoff; moderate permeability.
USE AND VEGETATION: Used for timber production. The natural vegetation is mainly grand fir, Douglas-fir, ponderosa pine, oceanspray, redstem ceanothus, chokeberry, mallow ninebark, and serviceberry.
DISTRIBUTION AND EXTENT: Latah County, Idaho. The series is of small extent.
MLRA OFFICE RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Latah County, Idaho, 1979.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - from 0 to 6 inches (A horizon)
Cambic horizon - from 6 to 34 inches (Bt1 and Bt2 horizons);
Particle-size control section: the zone from 10 to 40 inches;
Xeric soil moisture regime.