LOCATION JAEGIE MTEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive Eutric Haplocryalfs
TYPICAL PEDON: Jaegie gravelly coarse sandy loam, forested (Colors are for dry soil unless otherwise noted).
Oi--0 to 2 inches; forest litter of slightly decomposed needles, twigs, and leaves.
A--2 to 4 inches; brown (10YR 5/3) gravelly coarse sandy loam, dark brown (10YR 3/3) moist; moderate fine granular structure; soft,very friable, slightly sticky and slightly plastic; many very fine and fine and common medium roots; many very fine and common fine pores; 20 percent pebbles, 5 percent cobbles; slightly acid (pH 6.2); clear smooth boundary. (0 to 3 inches thick)
E--4 to 15 inches; yellowish brown (10YR 5/4) gravelly coarse sandy loam, brown (10YR 4/3) moist; moderate fine granular structure; soft, very friable, slightly sticky and slightly plastic; common very fine and fine and few medium roots; many very fine and common fine pores; 10 percent pebbles, 5 percent cobbles; moderately acid (pH 5.6); clear smooth boundary. (6 to 14 inches thick).
E/Bt--15 to 25 inches; E part (60 percent) is yellowish brown (10YR 5/4) gravelly coarse sandy loam, brown (10YR 4/3) moist; Bt part (40 percent) is yellowish brown (10YR 5/4) gravelly sandy clay loam, dark yellowish brown (10YR 4/4) moist; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and nonplastic; common very fine and fine and few medium roots; many very fine and common fine pores; few faint clay films on faces of peds and pebble surfaces; 15 percent pebbles and 5 percent cobbles; moderately acid (pH 5.8); clear wavy boundary. (8 to 14 inches thick)
Bt--25 to 43 inches; yellowish brown (10YR 5/4) gravelly sandy clay loam; dark yellowish brown (10YR 4/4) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine and few medium roots; many very fine and common fine pores; common distinct clay films on faces of peds and pebble surfaces; 20 percent pebbles and 5 percent cobbles; moderately acid (pH 6.0); clear wavy boundary. (14 to 30 inches thick)
C--43 to 60 inches; yellowish brown (10YR 5/4) gravelly coarse sandy loam; dark yellowish brown (10YR 4/4) moist; massive; loose, nonsticky and nonplastic; few very fine and fine roots; many very fine and fine and common medium pores; 20 percent pebbles and 5 percent cobbles; moderately acid (pH 6.0).
TYPE LOCATION: Gallatin County, Montana; 2,300 feet south and 2,000 feet west of the NE corner of sec.4, T.3 S., R.6 E.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 36 to 40 degrees F.
Mean summer soil temperature - 45 to 47 degrees F.
Moisture control section - between 4 and 12 inches.
A horizon - Value: 3 or 4 moist
Chroma: 3 or 4
Texture: coarse sandy loam or loam
Clay content: 10 to 20 percent
Rock fragments: 10 to 30 percent--10 to 20 percent pebbles, 0 to 10 percent cobbles
Reaction: pH 5.6 to 6.5
E horizon - Value: 5 or 6 dry; 3 or 4 moist
Chroma: 3, 4 or 6
Texture: coarse sandy loam or loam
Clay content: 10 to 20 percent
Rock fragments: 10 to 30 percent--10 to 20 percent pebbles, 0 to 10 percent cobbles
Reaction: pH 5.6 to 6.5
E/Bt horizon - Value: E part, 5 or 6 dry; 3 or 4 moist; Bt part 4 or 5 dry; 3, 4 or 5 moist
Chroma: 3 to 6
Texture: coarse sandy loam or sandy clay loam (mixed)
Clay content: 18 to 30 percent
Rock fragments: 10 to 30 percent--10 to 20 percent pebbles, 0 to 10 percent cobbles
Reaction: pH 5.6 to 6.5
Bt horizon - Value: 4 or 5 dry; 3, 4 or 5 moist
Chroma: 4 or 6
Clay content: 22 to 35 percent
Rock fragments: 10 to 35 percent--10 to 25 percent pebbles, 0 to 10 percent cobbles
Reaction: pH 5.6 to 6.5
C horizon - Value: 4, 5 or 6 dry; 3 or 4 moist
Chroma: 4 to 6
Clay content: 10 to 20 percent
Texture: sandy loam or coarse sandy loam
Rock fragments: 10 to 35 percent--10 to 25 percent pebbles, 0 to 10 percent cobbles
Reaction: pH 5.6 to 6.5
COMPETING SERIES:
Ericson (ID) - does not have an E/Bt horizon; has mean summer soil temperature of 55 to 59 degrees F.
Haviland (CO) - does not have an E/Bt horizon; has mean annual air temperature of 30 to 40 degrees F.; are strongly or very strongly acid throughout.
Hierro (CO) - does not have an E/Bt horizon; has hue of 5YR or redder in the Bt horizon.
Sapphire (MT) - has a lithic contact at 20 to 40 inches.
Tongue River (WY) - has a paralithic contact at 20 to 40 inches.
Trapper (MT) - has a lithic contact at more than 40 inches; has horizon of secondary carbonate accumulation.
Weminuche (CO) - has hue of 2.5YR or 5YR in the argillic horizon.
GEOGRAPHIC SETTING:
Landform - mountains.
Elevation - 5,400 to 7,000 feet.
Slope - 8 to 60 percent.
Parent material - colluvium derived from gniess, schist and igneous rock
Climate - long, cold winters; cool, moist springs; short summers.
Mean annual precipitation - 20 to 30 inches.
Mean annual air temperature - 34 to 38 degrees F.
Frost-free period - 50 to 70 days.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability.
USE AND VEGETATION: Jaegie soils are used mainly for woodland, understory grazing and wildlife habitat. Potential native vegetation includes Douglas fir, lodgepole pine, mallow ninebark, common snowberry, white spiraea, and pinegrass.
DISTRIBUTION AND EXTENT: Jaegie soils are of small extent in southwestern Montana.
MLRA OFFICE RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Gallatin County, Montana, 1997.
REMARKS: Soil interpretation record: MT1429, MT1606. Diagnostic horizons and features recognized in this pedon are: an ochric epipedon from 2 to 15 inches (E1, E2 horizons); an argillic horizon which is the particle-size control section from 25 to 43 inches (Bt horizon). Jaegie soils have a cryic temperature regime and a udic moisture regime.