LOCATION AUGGIE MTEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, active Eutric Glossocryalfs
TYPICAL PEDON: Auggie silt loam, in coniferous forest. (Colors are for dry soil unless otherwise noted.)
0i--0 to 2 inches; undecomposed and slightly decomposed forest litter.
E--2 to 8 inches; pinkish gray (7.5YR 7/2) silt loam, brown (10YR 5/3) moist; weak fine granular structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine roots; slightly acid (pH 6.2); clear smooth boundary. (4 to 10 inches thick)
Bt/E--8 to 22 inches; B part (75 percent) is light brown (7.5YR 6/4) silty clay loam, brown (7.5YR 5/4) moist; with interfingering of E part (25 percent) is pinkish gray (7.5YR 7/2) silt loam, pinkish gray (7.5YR 6/2) moist; texture mixed is silty clay loam; moderate coarse subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; common fine roots; common distinct clay films on faces of peds; slightly acid (pH 6.5); clear smooth boundary. (10 to 20 inches thick)
Bt--22 to 47 inches; light brown (7.5YR 6/4) silty clay loam, brown (7.5YR 5/4) moist; moderate coarse subangular blocky structure; slightly hard, friable, very sticky and very plastic; few fine and mediuim roots; many distinct clay films on faces of peds and along root channels; slightly alkaline (pH 7.5); gradual smooth boundary. (10 to 20 inches thick)
C--47 to 60 inches; pink (7.5YR 7/4) silt loam, brown (7.5YR 5/4) moist; weak medium platy lacustrine sediments; slightly hard, friable, slightly sticky and slightly plastic; few fine roots; slightly alkaline (pH 7.5).
TYPE LOCATION: Missoula County, Montana; approximately 2,500 feet south and 1,300 feet west of the NE corner of sec 1, T. 20 N., R. 17 W.
RANGE IN CHARACTERISTICS:
Soil temperature - 39 to 44 degrees F.
Moisture control section - between 4 and 12 inches
E Horizon - Hue: 10YR or 7.5YR
Value: 6, 7 or 8 dry, 5 or 6 moist
Chroma: 2 or 3
Clay content: 10 to 20 percent
Rock fragments: 0 to 10 percent gravel
Reaction: pH 5.6 to 7.3
Bt/E horizon - Hue: 10YR or 7.5YR
Value: B part 6 or 7 dry, 4, 5 or 6 moist; E part 6, 7, or 8 dry, 5, 6, or 7 moist
Chroma: B part 2, 3, or 4, E part 2 or 3
Texture: silt loam or silty clay loam
Clay content, mixed: 15 to 35 percent
Rock fragments: 0 to 10 percent gravel
Reaction: pH 6.1 to 7.3
Bt horizon: - Hue: 10YR or 7.5YR
Value: 6 or 7 dry; 4, 5 or 6 moist
Chroma: 2, 3, or 4
Clay content: 27 to 35 percent
Rock fragments: 0 to 10 percent gravel
Reaction: pH 6.1 to 7.8
C horizon - Hue: 10YR or 7.5YR
Value: 6, 7 or 8 dry; 4, 5 or 6 moist
Chroma: 2, 3, or 4
Texture: silt loam or very fine sandy loam
Clay content: 10 to 20 percent
Rock fragments: 0 to 10 percent gravel
Calcium carbonate equivalent: 0 to 5 percent
Reaction: pH 6.1 to 7.8
COMPETING SERIES:
There are no competing series.
GEOGRAPHIC SETTING:
Landform- lacustrine terraces in glaciated valleys.
Elevation - 3,400 to 4,400 feet.
Slope - 2 to 30 percent.
Parent material - glaciolacustrine deposits.
Climate - long, cold winters; moist springs; warm summers.
Mean annual precipitation - 24 to 35 inches, much of which falls as snow and as spring rain.
Mean annual temperature - 37 to 42 degrees F.
Frost-free season - 50 to 70 days.
GEOGRAPHICALLY ASSOCIATED SOILS:
DRAINAGE AND PERMEABILITY: Well drained; moderately slow permeability to a depth of 45 inches and moderate permeability below this depth.
USE AND VEGETATION: Auggie soils are used for timber production, as wildlife habitat, for watersheds, and for recreation. The native vegetation is coniferous forest consisting of subalpine fir, western larch, Douglas-fir, lodgepole pine, and Engelmann spruce with an understory of blue huckleberry, common beargrass, twinflower, pinegrass, and queencup beadlily.
DISTRIBUTION AND EXTENT: Auggie soils are inextensive in western Montana. MLRA 44A.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana.
SERIES ESTABLISHED: Missoula County, Montana, 1985.
REMARKS: Soil Interpretation Record: MT0562. Diagnostic horizons and features recognized in this pedon are: an ochric epipedon from 2 to 8 inches (E horizon); an argillic horizon from 8 to 47 inches (Bt/E, Bt horizons); a particle-size control section from 8 to 28 inches (Bt/E, Bt horizons). Auggie soils have a udic moisture regime and a cryic temperature regime.