LOCATION REPKIE MT
Established Series
Rev. PEM-JAL-RJS
11/2012
REPKIE SERIES
The Repkie series consists of very deep, somewhat excessively drained soils that formed in colluvium derived from fine and coarse grained igneous rocks. These soils are on escarpments, ridges, hillslopes and mountain slopes. Slopes are 25 to 60 percent. Mean annual precipitation is about 460 mm, and mean annual air temperature is about 4.5 degrees C.
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Typic Haplustepts
TYPICAL PEDON: Repkie very gravelly coarse sandy loam, in forest (colors are for dry soil unless otherwise noted).
Oi--0 to 2 cm; partially decomposed needles, twigs and leaves
A--2 to 20 cm; grayish brown (10YR 5/2) very gravelly coarse sandy loam, dark grayish brown (10YR 4/2) moist; weak fine and medium subangular blocky structure; soft, very friable, slightly sticky and nonplastic; many very fine, and few fine and medium roots; many very fine and few fine pores; 45 percent gravel; neutral (pH 7.0); clear wavy boundary. (10 to 25 cm inches thick)
E/Bw--20 to 48 cm; E part (70 percent) is very pale brown (10YR 7/3) very gravelly coarse sandy loam, brown (10YR 5/3) moist; Bw part (30 percent) is brown (10YR 5/3) very cobbly coarse sandy loam, brown (10YR 4/3) moist; weak fine and medium subangular blocky structure; soft, very friable, slightly sticky and nonplastic; many very fine, and few fine and medium roots; many very fine and few fine tubular and interstitial pores; 35 percent gravel and 20 percent cobbles; neutral (pH 6.7); clear wavy boundary. (0 to 64 cm thick)
Bw--48 to 109 cm; brown (10YR 5/3) very gravelly coarse sandy loam, brown (10YR 4/3) moist; weak fine and medium subangular blocky structure; soft, very friable, slightly sticky and nonplastic; common very fine, and few fine and medium roots; common very fine and few fine tubular and interstitial pores; 40 percent gravel and 15 percent cobbles; neutral (pH 6.6). (15 to 76 cm thick)
BC--109 to 152 cm; pale brown (10YR 6/3) very gravelly coarse sandy loam, grayish brown (10YR 5/2) moist; massive; soft, very friable, slightly sticky and slightly plastic; few very fine and fine roots; few very fine and fine tubular pores; 40 percent gravel and 10 percent cobbles; neutral (pH 6.6).
TYPE LOCATION: Jefferson County, Montana; 275 meters south and 335 meters west of the NE corner of sec. 3, T. 8N, R. 4W.
RANGE IN CHARACTERISTICS:
Soil temperature - 4.5 to 7.0 degrees C.
Note: Some pedons may have a C horizon.
A horizon
Hue: 10YR or 2.5Y; dry or moist
Value: 4 to 6 dry; 3 to 5 moist
Chroma: 2 to 4; dry or moist
Clay content: 10 to 18 percent
Texture: coarse sandy loam or sandy loam
Rock fragments: 20 to 60 percent--15 to 45 percent gravel, 0 to 10 percent cobbles, 0 to 5 percent stones
Reaction: pH 6.1 to 7.3
E/Bw horizon
Hue: 10YR or 2.5Y; dry or moist
Value: E part 6 or 7 dry; 5 or 6 moist
Bw part 5 or 6 dry; 4 or 5 moist
Chroma: E part 1 to 3; dry or moist
Bw part 2 to 4; dry or moist
Texture: coarse sandy loam or sandy loam
Clay content: 10 to 18 percent
Rock fragments: 20 to 60 percent--15 to 35 percent gravel, 10 to 20 percent cobbles, 0 to 5 percent stones
Reaction: pH 6.1 to 7.3
Bw horizon
Hue: 10YR or 2.5Y; dry or moist
Value: 5 or 6 dry; 4 or 5 moist
Chroma: 2 to 4; dry or moist
Texture: coarse sandy loam or sandy loam
Clay content: 10 to 18 percent
Rock fragments: 25 to 60 percent--20 to 40 percent gravel, 10 to 20 percent cobbles
Reaction: pH 6.1 to 7.3
BC horizon
Hue: 10YR or 2.5Y; dry or moist
Value: 5 or 6 dry; 4 or 5 moist
Chroma: 2 to 4; dry or moist
Texture: coarse sandy loam or sandy loam
Clay content: 10 to 18 percent
Rock fragments: 35 to 60 percent--30 to 50 percent gravel, 5 to 10 percent cobbles
Reaction: pH 6.1 to 7.3
COMPETING SERIES:
Calaveras (NM) - has horizons with an accumulation of silicate clays
Kadygulch (MT) - has more than 18 percent clay in the particle-size control section
Kingspoint (MT) - has horizons with secondary calcium carbonate accumulation
Mowbray (MT) - has horizons with secondary calcium carbonate accumulation
Pathead () - moderately deep to a lithic contact
Repp (MT) - have horizons with secondary calcium carbonate accumulation
Specie (CO) - has calcium carbonate above 60 cm
Wilde (MT) - moderately deep to a lithic contact
Wilspring (MT) - moderately deep to a lithic contact
GEOGRAPHIC SETTING:
Landform - escarpments, ridges, hillslopes and mountain slopes
Elevation - 1,250 to 1,830 meters
Slope - 12 to 60 percent
Parent material - colluvium derived from fine and coarse grained igneous rocks
Climate - long, cold winters; moist springs; warm summers
Mean annual precipitation - 380 to 500 cm
Mean annual air temperature - 2.0 to 6.0 degrees C.
Frost-free period - 70 to 105 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained, moderately rapid permeability.
USE AND VEGETATION: Repkie soils are primarily used for woodland. The potential native vegetation is mainly Douglas-fir, ponderosa pine, pinegrass, common snowberry, raceme pussytoes, heartleaf arnica, common juniper, rough fescue, Idaho fescue, and bluebunch wheatgrass.
DISTRIBUTION AND EXTENT: Repkie soils are of small extent in southwestern Montana. MLRA - 43B
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana.
SERIES ESTABLISHED: Jefferson County, Montana, 1998.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
ochric epipedon from 0 to 20 cm (Oi, A horizons)
cambic horizon 20 to 109 cm (E/Bw, Bw horizons)
particle-size control section - 27 to 102 cm (part of E/Bw, part of Bw horizons).
Repkie soils have a frigid temperature regime and an ustic moisture regime.
Additional Informaton: Soil interpretation record - MT3001.
National Cooperative Soil Survey
U.S.A.