LOCATION BUHRIG WA+IDEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, isotic Haploxerandic Haplocryepts
TYPICAL PEDON: Buhrig very stony loam - woodland. (Colors are for dry soils unless otherwise stated.)
Oi--0 to 0.5 inch; needles, leaves, twigs, and cones; abrupt smooth boundary. (0 to 2 inches thick)
A--0.5 to 3 inches; grayish brown (10YR 5/2) very stony ashy loam, very dark grayish brown (10YR 3/2) moist; weak fine granular structure; soft, very friable, slightly sticky and nonplastic; weakly smeary; many very fine and fine roots; many fine pores; 10 percent gravel, 20 percent cobbles, and 25 percent stones; NaF pH 11.0; slightly acid (pH 6.4); clear wavy boundary. (3 to 6 inches thick)
Bw1--3 to 7 inches; light yellowish brown (10YR 6/4) extremely stony ashy loam, brown (7.5YR 4/4) moist; weak fine subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; weakly smeary; many very fine and fine roots; many fine pores; 10 percent gravel, 25 percent cobbles, and 35 percent stones; NaF pH 11.0; slightly acid (pH 6.4); abrupt smooth boundary. (3 to 10 inches thick)
Bw2--7 to 11 inches; light yellowish brown (10YR 6/4) extremely stony ashy sandy loam, weak fine subangular blocky structure; dark yellowish brown (10YR 4/4) moist; soft, very friable, slightly sticky and nonplastic; weakly smeary; many very fine and fine roots; many fine pores; 10 percent gravel, 25 percent cobbles, and 40 percent stones; NaF pH 10.5; slightly acid (pH 6.4); clear wavy boundary. (3 to 8 inches thick)
2C--11 to 30 inches; light yellowish brown (2.5Y 6/4) extremely stony sandy loam, olive brown (2.5Y 4/4) moist; massive; soft, friable, slightly sticky and nonplastic; common very fine and fine roots; common fine pores; 10 percent gravel, 30 percent cobbles, and 40 percent stones; slightly acid (pH 6.4); clear wavy boundary. (12 to 19 inches thick)
2R--30 inches; fractured quartzite.
TYPE LOCATION: Pend Oreille County, Washington; 2,500 feet south and 2,400 feet west of the NE corner, section 16, T. 40 N., R. 45 E., WM.
RANGE IN CHARACTERISTICS: The soils are usually moist, but are dry in all parts between 8 and 24 inches or to the lithic contact for 45 to 60 consecutive days in 7 out of 10 years. The mean annual soil temperature is 41 to 43 degrees F. Depth to lithic contact ranges from 20 to 40 inches. Thickness of the volcanic ash is 7 to 14 inches and has an estimated moist bulk density of 0.65 to 0.85 g/cc, volcanic glass content of 30 to 60 percent, acid-oxalate extractable aluminum plus one-half of the acid-oxalate extractable iron of 1.0 to 2.0 percent, and 15-bar water retention of 5 to 12 percent. The particle size control section has 50 to 90 percent acid igneous and metasedimentary rock fragments. More than half are cobble, flags and stones. The soil is neutral to moderately acid throughout.
The A horizon has hue of 10YR or 7.5YR, value of 4 to 6 dry, 2 or 3 moist, and chroma of 2 to 4.
The Bw horizon has hue of 7.5YR or 10YR, value of 5 or 6 dry, 3 to 5 moist, and chroma of 3 or 4. Moist or dry, it is ashy loam, ashy silt loam, or ashy sandy loam. It is 10 to 15 percent gravel, 15 to 25 percent cobbles, 30 to 40 percent stones, and 0 to 10 percent channers.
The 2C horizon has hue of 10YR or 2.5Y; value of 5 to 7 dry, 3 through 5 moist, and chroma of 2 to 4, moist or dry. It is loam or sandy loam and is 10 to 35 percent gravel, 20 to 35 percent cobbles, and 35 to 45 percent stones. Some pedons formed in shaley rock are 20 to 50 percent channers, 5 to 20 percent flagstones and 0 to 5 percent stones.
COMPETING SERIES: These are the Buttoncreek, Devore, Finney, Gatewall, Myerscreek, Remmel, and Surgh series. Buttoncreek, Finney, Remmel and Surgh soils are more than 40 inches deep. Gatewall and Meyerscreek soils have a densic contact at depths of 20 to 40 inches. Devore soils have a average annual soil temperature of 39 to 41 degrees F.
GEOGRAPHIC SETTING: Buhrig soils are on mountainsides and ridgetops at elevations of 3,000 to 6,500 feet. Slopes range from 20 to 65 percent. These soils formed in residuum and colluvium derived from acid igneous and metasedimentary rocks with a mantle of volcanic ash and loess. The climate is characterized by warm, dry summers and cool, moist winters. Mean annual precipitation ranges from 20 to 45 inches. Average annual temperature ranges from 36 to 41 degrees F. The frost-free season is about 80 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Aits, Brickel, Hartill, Huckleberry, Inkler, Manley, Newbell, Raisio, and Wilmont soils. Aits, Hartill, Inkler, Manley, Newbell, and Wilmont soils are frigid. Brickel soils have a mollic epipedon. Huckleberry soils are medial over loamy-skeletal. Raisio soils are mesic.
DRAINAGE AND PERMEABILITY: Well drained; rapid to very rapid runoff; moderately rapid permeability.
USE AND VEGETATION: This soil is used for woodland, wildlife habitat, and recreation. Vegetation is Douglas-fir, grand fir, subalpine fir, and lodgepole pine with an understory of pinegrass, elksedge, and huckleberry.
DISTRIBUTION AND EXTENT: Northeastern Washington. The series is moderate in extent.
MLRA OFFICE RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Stevens County, Washington, l978.
REMARKS: Diagnostic horizons and features recognized in this pedon are an ochric epipedon from the mineral surface to 3 inches and a cambic horizon from 3 to 11 inches with an estimated moist bulk denisty of less than 1.0 g/cc and acid-oxalate extractable aluminum plus one-half of the acid-oxalate extractable iron of more than 1.0 percent, and a lithic contact at 30 inches.
The 3/2008 description reflects a change in classification from Loamy-skeletal, isotic Andic Eutrocryepts to Loamy-skeletal, isotic Haploxerandic Haplocryepts due to revision of the cryepts great groups and subgroups. The competing series section was not updated and should be reviewed after all the cryepts have been re-classified.