LOCATION JAYPEAK IDEstablished Series
TAXONOMIC CLASS: Ashy over loamy-skeletal, glassy over micaceous, frigid Typic Udivitrands
TYPICAL PEDON: Jaypeak gravelly silt loam, forest; on a north-facing slope of 65 percent at 3,650 feet elevation. When described on August 3, 1995, the soil was slightly moist throughout. (Colors are for dry soil unless otherwise stated.)
Oi--0 to 1 inch; needles, leaves, twigs, cones, moss, and bark. (0.5 to 1.5 inches thick)
Oe--1 to 2 inches; decomposed organic matter mixed with Mt. St. Helens volcanic ash. (0.5 to 1.5 inches thick)
A--2 to 3 inches; grayish brown (10YR 5/2) gravelly ashy silt loam, very dark grayish brown (10YR 3/2) moist; weak very fine and fine granular structure; soft, very friable, nonsticky and slightly plastic; many very fine and few fine roots; many very fine tubular pores; 15 percent gravel, 5 percent cobbles; neutral (pH 6.8); abrupt wavy boundary. (1 to 2 inches thick)
Bw1--3 to 9 inches; yellowish brown (10YR 5/4) gravelly ashy silt loam, dark yellowish brown (10YR 3/4) moist; weak medium and coarse subangular blocky structure; soft, very friable, nonsticky and slightly plastic; many very fine, few fine, medium and coarse roots; many very fine tubular pores; 15 percent gravel, 5 percent cobbles; neutral (pH 6.8); clear wavy boundary. (4 to 6 inches thick)
Bw2--9 to 19 inches; light yellowish brown (10YR 6/4) gravelly silt loam, dark yellowish brown (10YR 4/4) moist; weak medium subangular blocky structure; soft, very friable, nonsticky and slightly plastic; common very fine, few fine, medium and coarse roots; many very fine and few fine tubular pores; 20 percent gravel, 5 percent cobbles, and 5 percent stones; neutral (pH 6.8); clear wavy boundary. (7 to 12 inches thick)
2BC--19 to 26 inches; light yellowish brown (10YR 6/4) very gravelly loam, dark yellowish brown (10YR 4/4) moist; weak fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; common very fine tubular pores; many very fine and fine mica flakes; 40 percent gravel, 10 percent cobbles, and 10 percent stones; slightly acid (pH 6.3); gradual wavy boundary. (7 to 15 inches thick)
2C1--26 to 41 inches; light yellowish brown (10YR 6/4) extremely stony loam, dark yellowish brown (10YR 4/4) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; common very fine, few fine and medium tubular and irregular pores; many very fine and fine, few medium and coarse mica flakes; 20 percent gravel, 25 percent cobbles, and 35 percent stones; moderately acid (pH 6.0); gradual wavy boundary. (14 to 20 inches thick)
2C2--41 to 53 inches; light yellowish brown (10YR 6/4) extremely gravelly loam, dark yellowish brown (10YR 4/4) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; few very fine, fine and medium tubular and irregular pores; many very fine and fine, few medium mica flakes; 50 percent gravel, 15 percent cobbles, and 5 percent stones; very strongly acid (pH 4.8); gradual wavy boundary. (10 to 14 inches thick)
2C3--53 to 60 inches; light yellowish brown (10YR 6/4) extremely stony loam, dark yellowish brown (10YR 4/4) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; few fine roots; few very fine and fine tubular and irregular pores; many very fine and fine, few medium mica flakes; 20 percent gravel, 20 percent cobbles, and 45 percent stones; very strongly acid (pH 4.8).
TYPE LOCATION: Boundary County, Idaho; about 2.6 miles south of Naples, about 1,100 feet north and 2,025 feet east of the southwest corner of sec. 19, T. 60 N., R. 1 E; Latitude - 48 degrees, 32 minutes, 13 seconds North;
Longitude - 116 degrees, 23 minutes, 22 seconds West.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 43 to 46 degrees F.
Average summer soil temperature - 47 to 52 degrees F. with an O horizon
Moisture control section - dry 15 to 30 days (August to September), moist mid-September through July
Depth to bedrock - more than 60 inches
Surface stones - 0 to 3 percent
Volcanic ash mantle - 14 to 20 inches thick
Volcanic glass content - 30 to 65 percent
Acid-oxalate extr. Al + 1/2 Fe - 1.0 to 3.0 percent
Phosphate retention - 55 to 90 percent
15 bar water retention - 7 to 12 percent (air dried)
A horizon
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 1 or 2 dry or moist
Texture - ASHY-GR-SIL, ASHY-SIL, STV-ASHY-SIL
Clay content - 3 to 8 percent
Gravel content - 10 to 25 percent
Cobble content - 0 to 10 percent
Stone content - 0 to 5 percent
Bulk density - 0.65 to 0.90 g/cc
Reaction - moderately acid to neutral
Bw horizons
Value - 5 or 6 dry, 3 or 4 moist
Texture - ASHY-GR-SIL, ASHY-SIL, CB-ASHY-SIL
Clay content - 3 to 8 percent
Gravel content - 10 to 25 percent
Cobble content - 0 to 20 percent
Stone content - 0 to 5 percent
Bulk density - 0.65 to 0.90 g/cc
Reaction - slightly acid or neutral
2BC horizon
Hue - 10YR or 2.5Y
Value - 6 or 7 dry, 4 or 5 moist
Chroma - 3 or 4 dry or moist
Texture - GRV-L, GRV-FSL, CBV-VFSL, CBV-FSL, STV-L, STX-L, CBV-SL
Clay content - 3 to 10 percent
Gravel content - 20 to 40 percent
Cobble content - 10 to 25 percent
Stone content - 5 to 40 percent
Mica content - 25 to 35 percent
Reaction - moderately acid to slightly acid
2C horizons
Hue - 10YR or 2.5Y
Value - 6 or 7 dry, 4 or 5 moist
Chroma - 3 or 4 dry or moist
Texture - STX-L, GRX-L, CBX-FSL, CBX-L, STX-FSL, STX-VFSL, CBX-SL
Clay content - 3 to 10 percent
Gravel content - 20 to 50 percent
Cobble content - 15 to 45 percent
Stone content - 5 to 45 percent
Mica content - 25 to 35 percent
Reaction - very strongly acid to moderately acid
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Jaypeak soils are on north-facing mountain slopes, foothills, and breaklands. Slopes range from 5 to 85 percent. They formed in residuum derived from schist, gneiss, and granite bedrock with a thick mantle of volcanic ash. Elevations range from 1,800 to 4,900 feet. The average annual air temperature is 42 to 45 degrees F. and average annual precipitation is 30 to 50 inches. The average frost-free period is 70 to 110 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Baldeagle (T), Idamont, McArthur (T), Pend Oreille, and Redraven series. Baldeagle soils are on mountain slopes at higher elevations and are cryic. Idamont and Pend Oreille soils are on mountain and foothill slopes, formed in glacial till and are ashy over loamy. McArthur soils are on south-facing mountain slopes and are xeric. Redraven soils are on mountain slopes at higher elevations, formed in glacial till and are cryic.
DRAINAGE AND PERMEABILITY: Well drained; medium to rapid runoff; moderate permeability in the upper part and moderate to moderately rapid below.
USE AND VEGETATION: These soils are used for timber production, wildlife habitat, recreation, and watershed. Potential natural vegetation is mainly western hemlock, western redcedar, grand fir, Douglas-fir, western larch, western white pine, and lodgepole pine with an understory of queencup beadlily, Rocky Mountain maple, Oregon fairybells, common princes pine, Columbia brome, darkwoods violet, sidebells shinleaf, western rattlesnake plantain, myrtle pachystima, dampwoods blueberry, baldhip rose, white spirea, and western wintergreen.
DISTRIBUTION AND EXTENT: Northern Idaho, and possibly northwestern Montana and northeastern Washington. This series is not extensive
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana.
SERIES ESTABLISHED: Boundary County, Idaho, 2002.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from the mineral soil surface to 7 inches (A and part of Bw1 horizon)
Cambic horizon - the zone from 3 to 19 inches (Bw1 and Bw2 horizons)
Volcanic ash mantle - the zone from 2 to 19 inches (A, Bw1, and Bw2 horizons)
Particle-size control section - the zone from 2 to 42 inches (A, Bw1, Bw2, 2BC, 2C1 and part of the 2C2 horizon)
The mineralogy class was changed from paramicaceous to micaceous in 07/2010 by the National Soil Survey Center on request of the responsible MLRA regional office. The change was necessary based on the eleventh edition of the Keys to Soil Taxonomy, 2010.