LOCATION HAUGAN MTEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Typic Haplustalfs
TYPICAL PEDON: Haugan gravelly loam - forested. (Colors are for dry soil unless otherwise noted)
0i--0 to 0.5 inches; needles, grasses, leaves and twigs.
E--0.5 to 10 inches; light gray (10YR 7/2) and pale brown (10YR 6/3) gravelly loam, grayish brown (10YR 5/2) and brown (10YR 4/3) moist; weak fine and medium granular structure; slightly hard, friable, slightly sticky and slightly plastic; common fine and medium and few coarse roots; many very fine and micro tubular and common interstitial pores; 20 to 25 percent pebbles; clear smooth boundary. (4 to 20 inches thick)
Bt1--10 to 24 inches; pale brown (10YR 6/3), very pale brown (10YR 7/3) and dark brown (10YR 3/3) gravelly loam, dark brown (7.5YR 3/4) moist; moderate very fine subangular blocky structure; faint patchy clay films on pebbles and clay bridging sand grains; hard, friable, slightly sticky and slightly plastic; common fine and medium roots; many very fine and micro and common fine tubular pores; common clear sand grains on ped surfaces; 30 to 35 percent pebbles, 0 to 5 percent cobbles; clear wavy boundary. (8 to 22 inches thick)
Bt2--24 to 41 inches; light yellowish brown (10YR 6/4), yellowish brown (10YR 5/6), very pale brown (10YR 7/3) and dark yellowish brown (10YR 4/4) gravelly sandy clay loam, dark yellowish brown (7.5YR 4/4) and dark yellowish brown (10YR 4/4) moist; weak fine subangular blocky structure; hard, friable, slightly sticky and slightly plastic; common fine and few medium roots; many micro and very fine pores; prominent clay bridging of sand grains in yellowish brown irregular bands 1/4 inch thick; many micro and very fine pores; 25 to 35 percent pebbles, 5 to 10 percent cobbles; moderately alkaline; clear wavy boundary. (12 to 28 inches thick)
Ck--41 to 60 inches; light yellowish brown (10YR 6/4) and light gray (10YR 7/1) very gravelly loam, pale brown (10YR 6/3) and dark yellowish brown (10YR 4/4) moist; massive; strongly effervescent; 25 to 35 percent pebbles, 5 to 10 percent cobbles; common fine masses of lime.
TYPE LOCATION: Mineral County, Montana; 4.3 miles west from St. Regis Ranger Station turnoff on Mullan Gulch Road, then turn right and go 0.9 mile; NE 1/4 of the NE 1/4 of the NW 1/4 of section 9, T.18N., R.28W.
RANGE IN CHARACTERISTICS:
Soil temperature - 45 to 47 degrees F.
Depth to Ck horizon - 36 to 60 inches.
E horizon - Hue: 2.5Y to 7.5YR
Value: 6 or 7 dry; 4 or 5 moist
Chroma: 2 or 3
Clay content: 10 to 18 percent
Rock fragments: 20 to 30 percent--0 to 5 percent cobbles; 20 to 25 percent pebbles
Reaction: pH 6.6 to 7.8
Bt1 horizon - Hue: 2.5Y to 7.5YR
Value: 6 or 7 dry; 3 or 4 moist
Chroma: 3 or 4
Texture: loam or sandy clay loam
Clay content: 18 to 27 percent
Rock fragments: 20 to 35 percent--0 to 5 percent cobbles; 20 to 30 percent pebbles
Reaction: pH 6.6 to 7.3
Bt2 horizon - Hue: 2.5Y to 7.5YR
Value: 6 or 7 dry
Chroma: 3 or 4
Texture: loam or sandy clay loam
Clay content: 23 to 35 percent
Rock fragments: 25 to 35 percent--5 to 10 percent cobbles; 20 to 25 percent pebbles
Reaction: pH 7.4 to 8.4
Ck horizon - Hue: 2.5Y to 7.5YR
Value: 5, 6 or 7 dry; 4, 5 or 6 moist
Chroma: 1 to 6
Clay content: 10 to 27 percent
Rock fragments: 25 to 45 percent--5 to 10 percent cobbles; 20 to 35 percent pebbles
Calcium carbonate equivalent: 5 to 15 percent
Reaction: pH 7.9 to 8.4
COMPETING SERIES:
Alderon (WY) - is moderately deep to a paralithic contact.
Allens Park (CO) - is moderately deep to a lithic contact.
Bayerton (WY) - is moderately deep to a lithic contact.
Belltower (MT) - is moderately deep to a paralithic contact.
Elbeth (CO) - does not have horizon of secondary carbonate accumulation.
Elbuck (NM) - does not have horizon of secondary carbonate accumulation.
Elmark (MT) - is moderately deep to a paralithic contact.
Hoyt (MT) - does not have horizon of secondary carbonate accumulation.
Jemco (CO) - is moderately deep to a lithic contact.
Kunz (UT) - does not have horizon of secondary carbonate accumulation.
Losindios (NM) - does not have horizon of secondary carbonate accumulation.
Lumpgulch (MT) - is moderately deep to a paralithic contact.
Northrim (CO) - does not have horizon of secondary carbonate accumulation.
Plome (CO) - does not have horizon of secondary carbonate accumulation.
Rule (CO) - is moderately deep to a paralithic contact.
Shoemaker (NM) - is moderately deep to a lithic contact.
Sweetweed (MT) - does not have horizon of secondary carbonate accumulation.
Tunitcha (NM) - is deep to a paralithic contact.
GEOGRAPHIC SETTING:
Landform - mountains
Elevation - 2,500 to 4,500 feet
Slope - 0 to 65 percent
Parent material - residuum
Mean annual temperature - 42 to 45 degrees F.
Mean annual precipitation - 23 to 25 inches
Frost-free period - 70 to 90 days
DRAINAGE AND PERMEABILITY: Well-drained; moderate permeability.
USE AND VEGETATION: Used for timber production and wildlife habitat. Ponderosa pine and Douglas fir in the overstory. Understory vegetation is spiraea, rose, ninebark, and pinegrass.
DISTRIBUTION AND EXTENT: Haugan soils are inextensive in the mountains of western Montana.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Mineral County (St. Regis-Nine Mile Area), Montana, 1970.
REMARKS: Diagnostic horizons and features recognized in this pedon are: an argillic horizon from 10 to 41 inches (Bt horizons); a horizon of secondary carbonate accumulation from 41 to 60 inches (Ck horizon); a particle-size control section from 10 to 30 inches (Bt1 and part of the Bt2 horizon). Haugan soils have a frigid temperature regime and an ustic moisture regime.