LOCATION ANGELPEAK OREstablished Series
TAXONOMIC CLASS: Ashy over loamy-skeletal, amorphic over isotic Typic Vitricryands
TYPICAL PEDON: Angelpeak gravelly ashy silt loam - on a 46 percent north-facing slope, woodland. ( Colors are for moist soil unless otherwise noted.)
Oi--0 to 2 inches; partially decomposed fir needles, grass and moss.
A--2 to 14 inches; dark brown (10YR 3/3) gravelly ashy silt loam, pale brown (10YR 6/3) dry; weak fine subangular blocky structure parting to fine granular; soft, very friable, nonsticky, nonplastic and moderately smeary; many very fine and medium roots; many very fine and fine irregular pores; 20 percent gravel; slightly acid (pH 6.2); clear smooth boundary. (5 to 15 inches thick)
Bw--14 to 29 inches; brown (10YR 4/3) gravelly ashy loam, very pale brown (10YR 7/4) dry; weak fine and medium subangular blocky structure; soft, very friable, nonsticky, nonplastic and moderately smeary; common fine roots and few medium and coarse; common fine and medium tubular pores; 30 percent gravel; slightly acid (pH 6.2); abrupt wavy boundary. (10 to 15 inches thick)
2C1--29 to 49 inches; brown (10YR 4/3) extremely gravelly loam, pale brown (10YR 6/3) dry; massive; slightly hard, firm, nonsticky and nonplastic; common very fine and fine roots; common very fine and fine random tubular pores; 70 percent gravel; slightly acid (pH 6.4); clear wavy boundary. (15 to 30 inches thick)
2C2--49 to 60 inches; brown (10YR 4/3) extremely gravelly sandy loam, light brownish gray (10YR 6/2) dry; massive; soft, friable, nonsticky and nonplastic; few very fine roots; few very fine irregular pores; 80 percent gravel; neutral (pH 6.6); clear wavy boundary. (10 to 20 inches thick)
2R--60 inches; argillite.
TYPE LOCATION: Baker County, Oregon; located 2,600 feet north and 900 feet east of the SW corner of section 14, T. 9 S., R.38 E.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 42 to 47 degrees F, and the mean summer soil temperature is 43 to 47 degrees F. These soils are usually moist; they are dry in the moisture control section for 30 to 45 consecutive days following the summer solstice. Depth to bedrock is typically 40 to 60 inches but may be greater than 60 inches in some pedons. The particle-size control section is from the mineral soil surface to 40 inches below the mineral surface. The upper (ashy) part is 14 to 30 inches thick, has moist bulk density of 0.65 to 0.85 g/cubic centimeter, 60 to 80 percent glass in the 0.02 to 2.0 mm fraction, phosphate retention of 60 to 90 percent; and ammonium oxalate extractable aluminum plus one-half iron of 1.5 to 3.0 percent, eight times silica plus two times iron of 5 to 12 percent and eight times silica minus two times iron of 4 to 8 percent. The lower (loamy-skeletal) part of the pscs has 5 to 15 percent clay, less than 25 percent very coarse, coarse and medium sand, and 60 to 85 percent angular rock fragments.
The A horizon has value of 2 through 4 moist, 5 through 7 dry and chroma of 3 or 4 moist and dry. It has 10 to 20 percent gravel and 0 to 10 percent cobbles.
The Bw horizon has value of 3 or 4 moist, 6 or 7 dry and chroma of 3 or 4 moist and dry. Texture is ashy silt loam or gravelly ashy silt loam, with 10 to 30 percent gravel. Base saturation (sum of cations) is 20 to 35 percent.
The 2C horizon (some pedons described with 2Eb and 2Bwb horizons) has value of 4 or 5 moist, 6 or 7 dry and chroma of 2 through 4 moist and dry. The fine earth fraction is loam or sandy loam. It is 60 to 70 percent gravel and 0 to 15 percent cobbles. Reaction is slightly acid or neutral and base saturation (sum of cations) is 35 to 65 percent.
COMPETING SERIES:
Ashnola(T)--moderately deep and deep (35 to 50 inches) to a densic contact, very deep (>60 inches) to bedrock, ashy part of the pscs is gravelly ashy sandy loam with less than 50 percent silt, formed in volcanic ash over till from sedimentary and volcanic rocks
Bucketlake--very deep (>60 inches), loamy-skeletal part of the pscs has subrounded and rounded rock, formed in volcanic ash over till from granite
Ducklake (T)--deep (40 to 60 inches) to a densic contact, very deep (>60 inches) to bedrock, loamy-skeletal part of the pscs has rounded and well rounded rock fragments, formed in volcanic ash over till from granite
Lackeyshole (T)--base saturation in the Bw horizon is 15 to 35 percent, loamy-skeletal part of has 35 to 55 percent subangular rock fragments, formed in volcanic ash over colluvium from andesitic basalt and basalt
McCalpinemeadow (T)--moderately deep (20 to 40 inches) to a lithic contact, loamy-skeletal part of the pscs has subangular rock fragments greater than 25 percent very coarse, coarse and medium sand, formed in volcanic ash over colluvium from granite and granodiorite
Mountemily--very deep (>60 inches), loamy-skeletal part of the pscs has subangular and angular rock fragments, clay content of 18 to 30 percent and is moderately acid to slightly acid, formed in volcanic ash over colluvium from basalt
Mudlakebasin (T)--moderately deep (20 to 40 inches) to a lithic contact, loamy-skeletal part of the pscs has well rounded and rounded rock fragments, formed in volcanic ash over till from granite
Towermountain (T)--moderately deep (20 to 40 inches) to a paralithic contact, formed in volcanic ash over colluvium from rhyolitic tuff
Troutmeadows--moderately deep (20 to 40 inches) to a lithic contact, loamy-skeletal part of the pscs has subangular rock fragments and clay content of 10 to 18 percent, formed in volcanic ash over colluvium from basalt
Ufish (T)--deep (40 to 60 inches) to a lithic contact, base saturation in the Bw horizon is 2 to 10 percent, loamy-skeletal part of pscs is strongly acid or moderately acid, has greater than 25 percent very coarse, coarse and medium sand, and has 35 to 55 percent subangular rock fragments formed in volcanic ash over colluvium from granite and granodiorite
GEOGRAPHIC SETTING: Angelpeak soils are on north-facing side slopes of mountains. Elevations range from 6,200 to 8,500 feet. Slope is 30 to 80 percent. The soil is formed in colluvium derived dominantly from argillite with a mantle of volcanic ash in the surface. The climate is characterized by cold wet winters and cool moist summers. The average annual precipitation is 30 to 40 inches. The average annual temperature is 35 to 40 degrees F. The frost-free period is 20 to 40 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Crackler, Eaglecap, Highhorn, Huntrock, Rouen and Stices soils. The Crackler, Rouen and Stices soils are frigid and are on lower elevation north slopes. Eaglecap soils are loamy-skeletal and are on adjacent granitic mountains. Highhorn and Huntrock soils are frigid and are on adjacent south slopes.
DRAINAGE AND PERMEABILITY: Well drained. Permeability is moderate in the surface horizons and moderately rapid in the subsoil.
USE AND VEGETATION: These soils are used for timber production, watershed and wildlife habitat. The native vegetation is subalpine fir, lodgepole pine and western larch with an understory of elk sedge and grouse blueberry.
DISTRIBUTION AND EXTENT: Elkhorn Mountains of northeastern Oregon; MLRA 43. The soils are of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Baker County Area, Oregon; 1988.
REMARKS: Diagnostic horizons and features in this pedon are:
Ochric epipedon - the zone from 2 to 14 inches (A horizon).
Cambic horizon - the zone from 14 to 29 inches (Bw horizon).
Particle-size control section - from 2 to 42 inches with 2 to 29 inches (A and Bw horizon) meeting ashy family criteria and
from 29 to 42 inches (Upper 13 inches of 2C1 horizon) meeting loamy-skeletal family criteria.
Classification revision 03/01 from ashy over loamy-skeletal, mixed, superactive Typic Vitricryands to ashy over loamy-skeletal, amorphic over mixed Typic Vitricryands.
Classification revision 02/03 from amorphic over mixed mineralogy to amorphic over isotic.
ADDITIONAL DATA: NSSL number S95OR-023-001 (pedon 95P902), and pedon number 86T7085 .