LOCATION MINALOOSA ID
Established Series
Rev. RJB/BDG/EMM
06/2013
MINALOOSA SERIES
The Minaloosa series consists of very deep, well drained soils that formed in loess mixed with residuum and colluvium from metasedimentary rock. Minaloosa soils are on hills and uplands and have slopes of 15 to 60 percent. The mean annual precipitation is about 28 inches and the mean annual temperature is about 45 degrees F.
TAXONOMIC CLASS: Loamy-skeletal, isotic, frigid Vitrandic Haploxerepts
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) ashy 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 gravel; moderately acid (pH 6.0); clear wavy boundary. (3 to 7 inches thick)
AB--6 to 12 inches; yellowish brown (10YR 5/4) ashy 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 gravel and 5 percent cobbles; moderately acid (pH 6.0); clear wavy boundary. (0 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 gravel 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 gravel and 5 percent cobbles; very few faint clay films; moderately acid (pH 5.6); gradual wavy boundary. (10 to 30 inches thick)
BC--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 gravel and 10 percent cobbles; strongly acid (pH 5.4); gradual wavy boundary. (0 to 20 inches thick)
C--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:
The mean annual soil 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.
The particle-size control section contains 35 to 60 percent rock fragments.
Volcanic ash influence - 7 to 10 inches thick
Estimated properties of the volcanic ash influenced layers:
Volcanic glass content - 5 to 20 percent
Acid oxalate Al + 1/2 Fe - 0.4 to 1.0 percent
Moist bulk density - 1.2 to 1.40 g/cc
A horizon:
Value - 4 to 6 dry, 2 to 4 moist
Chroma - 2 or 3 dry or moist
Texture - ashy silt loam or ashy loam
Clay content - 8 to 15 percent
Rock fragment content - 2 to 15 percent gravel
Reaction - 5.6 to 6.8
AB or BA horizons:
Hue - 7.5YR or 10YR
Value - 5 to 7 dry, 3 to 6 moist
Chroma - 2 to 4 dry or moist
Texture - ashy silt loam, ashy loam, silt loam or loam
Clay content - 8 to 18 percent
Rock fragment content - 15 to 25 percent gravel
Reaction - 5.2 to 6.4
Bt or Bw horizons:
Hue - 7.5YR or 10YR
Value - 5 to 7 dry, 3 to 5 moist
Chroma - 3 or 4 dry or moist
Texture - silt loam, loam or sandy loam
Clay content - 14 to 22 percent
Rock fragment content - 30 to 55 percent gravel, 0 to 10 percent cobbles, 35 to 55 percent total rock fragment content
Reaction - 5.2 to 6.4
BC horizons (where present):
Hue - 7.5YR or 10YR
Value - 5 to 7 dry, 4 or 5 moist
Chroma - 3 or 4 dry or moist
Texture - loam or sandy loam
Clay content - 6 to 22 percent
Rock fragment content - 45 to 55 percent gravel, 0 to 30 percent cobbles, 45 to 70 percent total rock fragment content
Reaction - 5.0 to 6.2
C horizons:
Hue - 7.5YR or 10YR
Value - 5 to 7 dry, 3 to 5 moist
Chroma - 3 or 4 dry or moist
Texture - loam or silt loam
Clay content - 6 to 18 percent
Rock fragment content - 45 to 75 percent gravel, 0 to 40 percent cobbles, 45 to 90 percent total rock fragment content
Reaction - 5.0 to 6.2
COMPETING SERIES:
Analulu soils - are moderately deep to lithic contact
Ardenvoir soils - are deep to a paralithic contact
Ardtoo soils - are deep to a paralithic contact
Blackprince soils - are moderately deep to a paralithic contact
Blinn soils - are moderately deep to lithic contact
Brevco soils - are moderately deep to lithic contact
Coxit soils - are dry for 60 to 75 consecutive days following the summer solstice
Daxty soils - are moderately deep to a lithic contact
Easte soils - are deep to a paralithic contact
Highhorn soils - are deep to a lithic contact
Huntrock soils - are moderately deep to a lithic contact
Jimbluff soils - are dry for 60 to 75 consecutive days following the summer solstice
Jumpe soils - are dry for 60 to 75 consecutive days following the summer solstice
Kamela soils - are moderately deep to a lithic contact
Lekrem soils - are dry for 60 to 75 consecutive days following the summer solstice
Lemoncreek soils- are moderately deep to a lithic contact
Longort soils - are moderately deep to densic materials
Noil soils - are deep to a paralithic contact
Ontrail soils - are dry for 60 to 75 consecutive days following the summer solstice and have hues of 5YR in the subsoil
Radercreek soils - are deep to a lithic contact
Redpeak soils - are moderately deep to lithic contact
Sandtop soils - are moderately deep to lithic contact
Seeburg soils - are dry for 60 to 75 consecutive days following the summer solstice
Thout soils - are moderately deep to lithic contact
Threecabin soils - are deep to a lithic contact
Warfield soils - are deep to a lithic contact
GEOGRAPHIC SETTING: The soils are on hills and uplands and have slopes of 15 to 60 percent. Elevation is 2,680 to 3,720 feet (817 to 1134 meters). The soils formed in loess mixed with residuum and colluvium from metasedimentary rock. The mean annual precipitation is 26 to 44 inches (584 to 750 mm). The frost-free period ranges from 95 to 130 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Arson soils. Arson soils are deep to a paralithic contact and are on side slopes, shoulders and ridge summits of foothills and low mountains.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; moderately high saturated hydraulic conductivity.
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 43A.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) 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 47 inches (Bt1, Bt2 and BC horizons);
Particle-size control section: the zone from 10 to 40 inches;
Xeric soil moisture regime.
The 8/2009 description reflects an update in classification from Loamy-skeletal, mixed, superactive, frigid Typic Dystroxerepts to Loamy-skeletal, isotic, frigid Vitrandic Haploxerepts. C1 horizon from 34 to 27 inches changed to BC horizon. Changes made based on updated mapping in Latah County and on a description completed at the original Minaloosa type location in 2008.
National Cooperative Soil Survey
U.S.A.