LOCATION DRAGNOT IDEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Typic Argixerolls
TYPICAL PEDON: Dragnot stony loam -- on a 50 percent south-facing slope at 1,240 feet elevation in forest. When described on August 4, 1986, the soil was dry throughout. (Colors are for dry soil unless otherwise stated).
A1--0 to 4 inches; brown (10YR 5/3) stony loam, very dark grayish brown (10YR 3/2) moist; weak fine to coarse granular structure; slightly hard, very friable, slightly sticky and nonplastic; common very fine and fine roots; many very fine, fine, and medium tubular pores; 15 percent fine gravel, 3 percent stones; neutral (pH 7.0)); clear smooth boundary.
A2--4 to 11 inches; brown (10YR 4/3) loam, very dark grayish brown (10YR 3/2) moist; weak fine to coarse granular structure; slightly hard, very friable, slightly sticky and nonplastic; many medium and common very fine and fine roots; many very fine and fine tubular and irregular pores; 10 percent fine gravel; neutral (pH 6.8); clear smooth boundary. (combined thickness of the A1 and A2 horizons is 8 to 16 inches)
Bt--11 to 18 inches; brown (10YR 4/3) fine gravelly loam, dark brown (10YR 3/3) moist; weak fine to coarse subangular blocky structure; hard, very friable, slightly sticky and nonplastic; common very fine, fine, and medium roots; many very fine and fine tubular and irregular pores; common faint patchy clay films on faces of peds and in pores; 15 percent fine gravel; neutral (pH 6.8); abrupt wavy boundary. (5 to 14 inches thick)
BC--18 to 31 inches; brown (10YR 5/3) very gravelly sandy loam, brown (10YR 4/3) moist; massive; hard, very friable, nonsticky and nonplastic; many very fine, fine, and medium roots; common very fine and fine tubular and irregular pores; 60 percent fine gravel; neutral (pH 6.8); abrupt wavy boundary. (0 to 18 inches thick)
R--31 inches; granodiorite.
TYPE LOCATION: Lewis County, Idaho; about 12 miles west of Kamiah; about 2,000 feet north and 2,100 feet east of the southwest corner of section 7, T. 34 N., R. 3 E.; USGS Sixmile Creek topographic quadrangle; latitude - 46 degrees, 18 minutes, 08 seconds N. and longitude - 116 degrees, 07 minutes, 44 seconds W.
RANGE IN CHARACTERISTICS:
Thickness of mollic epipedon - 8 to 16 inches
Base saturation - 75 to 95 percent
Depth to bedrock - 20 to 40 inches
Average annual soil temperature - 49 to 52 degrees F
A horizon
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 2 or 3, dry or moist
Reaction - slightly acid or neutral
Bt horizon
Value - 4 or 5 dry, 3 or 4 moist
Textures - L, GRF-L
Gravel content - 5 to 20 percent, dominantly fine
Clay content - 18 to 24 percent
Reaction - slightly acid or neutral
BC horizon
Value - 4 or 5 dry
Chroma - 3 or 4 dry or moist
Textures - GRV-SL, GRV-L
Clay content - 5 to 15 percent
Gravel content - 40 to 60 percent, dominantly fine
Reaction - slightly acid or neutral
COMPETING SERIES: These are the Ahsahka, Buckbay(T), Colma, Currymountain, Duzel, Elkheights, Facey, Farrot, Foehlin, Hatspring(T), Immiant, Jauriga(T), Ladd, Lobitos, Los Gatos, Mehlhorn, Picketpin, Pittville, Sagaser, Taneum, Tieton, Tweedy, and Vollmer series. Ahsahka, Colma, Elkheights, Facey, Foehlin, Jauriga, Ladd, Picketpin, Pittville, Sagaser, Taneum, and Tieton soils are greater than 40 inches deep. Buckbay, Currymountain, Duzel, and Tweedy soils are moderately deep to a paralithic contact. Duzel, Lobitos, Los Gatos, and Tweedy soils have average annual soil temperatures greater than 52 degrees. Farrot, Immiant, Mehlhorn, and Vollmer soils are more than 24 percent clay in the Bt horizon. Hatspring soils are silt loam or silty clay loam in the Bt horizon and are slightly or moderately alkaline in the Bt horizon.
GEOGRAPHIC SETTING: Dragnot soils are on canyons, commonly on south- and west-facing slopes. Slopes range from 40 to 70 percent. These soils formed in colluvium from granodiorite. Elevation is 1,200 to 3,000 feet. Average annual precipitation is 22 to 24 inches, average annual temperature is 47 to 49 degrees F., and the frost free period is 120 to 150 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Johnson and Hooverton series. Johnson soils are on north- and east-facing canyon sides and are very deep. Hooverton soils are on south- and west-facing canyon sides associated with basalt, and are loamy-skeletal.
DRAINAGE AND PERMEABILITY: Well drained; very rapid runoff; moderate permeability.
USE AND VEGETATION: These soils are used for timber production and livestock grazing. Native vegetation is mainly ponderosa pine, common snowberry, pine reedgrass, Saskatoon serviceberry, Idaho fescue, and arrowleaf balsamroot.
DISTRIBUTION AND EXTENT: Northern Idaho. This soil is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Lewis County, Idaho, 1995.
REMARKS: Diagnostic horizons and features recognized in this pedon:
Mollic epipedon - from the surface to 11 inches (A1 and A2 horizons).
Argillic horizon - from 11 to 18 inches (Bt horizon).
Particle-size control section - the zone from 11 to 18 inches (Bt horizon).
Lithic contact - at 31 inches.