LOCATION BULGAR OR
Established Series
Rev. JW/DAL/KMS
11/2018
BULGAR SERIES
Landscape--mountains
Landform--mountain slopes, mass failures on mountain slopes
Slope--0 to 90 percent
Parent material--thick mantle of volcanic ash over till derived from mixed sources
Mean annual precipitation--about 1030 mm
Mean annual air temperature--about 4 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--frigid
Soil moisture subclass--typic
TAXONOMIC CLASS: Ashy over loamy-skeletal, amorphic over isotic, frigid Typic Udivitrands
TYPICAL PEDON: Bulgar cobbly ashy silt loam on a 45-percent, planar, northeast-facing slope at an elevation of 1303 m
Oi--0 to 5 cm; needles and twigs
A--5 to 18 cm; cobbly ashy silt loam, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; weak medium and fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine and fine, common medium, and few coarse roots; common fine and few medium irregular pores; 10 percent gravel, 5 percent cobbles, and 2 percent stones; slightly acid (pH 6.5); clear wavy boundary
Bw--18 to 53 cm; cobbly ashy silt loam, yellowish brown (10YR 5/6) dry, dark yellowish brown (10YR 3/4) moist; weak medium and fine subangular blocky structure; soft, very friable, slightly sticky and nonplastic; common fine, medium, and coarse roots; few fine and medium tubular pores; 15 percent gravel, 10 percent cobbles, and 2 percent stones; slightly acid (pH 6.5); clear wavy boundary
2EBb--53 to 69 cm; very cobbly sandy loam, brown (10YR 5/3) dry, olive brown (2.5Y 4/4) moist; weak very fine and fine subangular blocky structure; soft, friable, slightly sticky and slightly plastic; common fine, medium, and coarse roots; common fine irregular pores; 30 percent gravel, 20 percent cobbles, and 10 percent stones; strongly acid (pH 5.1); gradual smooth boundary
2Bwb--69 to 107 cm; very cobbly loam, light yellowish brown (2.5Y 6/4) dry, olive brown (2.5Y 4/4) moist; weak fine and very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common fine, medium, and coarse roots; 25 percent gravel, 20 percent cobbles, and 10 percent stones; strongly acid (pH 5.5); gradual smooth boundary
2BCb--107 to 155 cm; very cobbly loam, light yellowish brown (2.5Y 6/4) dry, olive brown (2.5Y 4/4) moist; weak very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common fine and few medium roots; 25 percent gravel, 20 percent cobbles, and 10 percent stones; strongly acid (pH 5.5)
TYPE LOCATION: Baker County, Oregon; in the SW1/4NE1/4SW1/4 of section 6, T. 7 S., R. 46 E.; latitude 44.9839548, longitude -117.1373671, datum WGS 84 (coordinates from unknown source)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--3 to 7 degrees C
Mean summer soil temperature--7 to 12 degrees C
Mean winter soil temperature--0 to 3 degrees C
Soil moisture--dry 30 to 45 days in summer
Thickness of ash-influenced layers--40 to 50 cm
Estimated properties of layers influenced by volcanic ash
*Ammonium oxalate extractable Al + 1/2 Fe--1.0 to 3.0 percent
*0.02- to 2.0-mm fraction--40 to 60 percent
*Glass content in 0.02- to 2.0-mm fraction--60 to 90 percent
*1/3-bar bulk density--0.65 to 1.0 g/cm3
*Phosphate retention--40 to 90 percent
*15-bar water retention--5 to 12 percent (dried samples)
*Acid oxalate 8 Si plus 2 Fe--5 to 12 percent
*Acid oxalate 8 Si minus 2 Fe--4 to 8 percent
Particle-size control section
*Zone--from mineral soil surface to a depth of 100 cm
*Ashy upper part--40 to 50 cm thick; 3 to 7 percent clay; 5 to 30 percent rock fragments
*Loamy-skeletal lower part--55 to 65 cm thick; 6 to 13 percent clay; 50 to 70 percent rock fragments
*Rock fragment shape--rounded
A horizon
Hue--7.5YR, 10YR
Value--2 or 3 moist, 4 to 6 dry
Chroma--2 to 4 moist, 3 or 4 dry
Fine-earth texture--ashy silt loam
Clay content--3 to 7 percent
Sand content--15 to 40 percent
Organic matter content--2 to 6 percent
Total rock fragment content--0 to 25 percent
Gravel content--0 to 15 percent
Cobble content--0 to 5 percent
Stone content--0 to 5 percent
Reaction--6.1 to 7.3
Thickness--3 to 15 cm
Bw horizon
Hue--7.5YR, 10YR
Value--3 to 5 moist, 5 to 8 dry
Chroma--4 to 6 moist, 4 or 6 dry
Fine-earth texture--ashy silt loam
Clay content--3 to 7 percent
Sand content--15 to 40 percent
Organic matter content--1 to 3 percent
Total rock fragment content--0 to 30 percent
Gravel content--0 to 20 percent
Cobble content--0 to 10 percent
Stone content--0 to 5 percent
Reaction--6.1 to 7.3
Thickness--25 to 45 cm
2Eb horizon, or 2Ab, 2AEb, or 2Eb horizon (where present)
Hue--2.5Y, 7.5YR, 10YR
Value--4 or 5 moist, 5 or 6 dry
Chroma--4 to 6 moist, 4 dry
Fine-earth texture--sandy loam, silt loam
Clay content--6 to 15 percent
Sand content--20 to 55 percent
Organic matter content--1 to 2 percent
Total rock fragment content--40 to 65 percent
Gravel content--10 to 30 percent
Cobble content--15 to 25 percent
Stone content--5 to 20 percent
Reaction--5.1 to 6.5
Thickness--15 to 50 cm
2Bwb horizon
Hue--2.5Y, 7.5YR, 10YR
Value--3 to 5 moist, 5 to 7 dry
Chroma--4 to 6 moist, 3 or 4 dry
Fine-earth texture--sandy loam, loam
Clay content--5 to 14 percent
Sand content--45 to 65 percent
Organic matter content--1 to 2 percent
Total rock fragment content--35 to 70 percent
Gravel content--15 to 35 percent
Cobble content--15 to 25 percent
Stone content--5 to 20 percent
Reaction--5.1 to 6.5
Thickness--30 to 50 cm
2BCb horizon
Hue--2.5Y, 7.5YR, 10YR
Value--4 or 5 moist, 5 to 7 dry
Chroma--3 or 4 moist or dry
Fine-earth texture--sandy loam, loam
Clay content--5 to 17 percent
Sand content--50 to 70 percent
Organic matter content--1 to 2 percent
Total rock fragment content--50 to 80 percent
Gravel content--15 to 45 percent
Cobble content--20 to 25 percent
Stone content--5 to 20 percent
Reaction--5.1 to 6.5
Thickness--25 to 65 cm
COMPETING SERIES:
Bouldercreek--not formed in till
Boulderjud--deep (100 to 150 cm) to paralithic contact (granite); 30 to 65 percent glass in 0.02- to 2.0-mm fraction of ashy part of particle-size control section; 2Bt horizon below ash mantle; formed in coarse-silty volcanic ash over colluvium and residuum derived from granitic rock
Bullroar--very deep (more than 150 cm); 60 to 90 percent glass in 0.02- to 2.0-mm fraction of ashy part of particle-size control section; ash mantle that has less than 5 percent rounded rock fragments; loam, sandy loam, or loamy sand 2BC horizon (loamy-skeletal); 2EBb, 2ACb, or 2Eb buried surface horizon below ash mantle; coarse sand and gravel in lower part of series control section (150 to 200 cm); rounded alluvial fragments in lower part of particle-size control section; formed in volcanic ash over mixed alluvium
Deardorf--moderately deep (50 to 100 cm) to lithic contact; 60 to 90 percent glass in 0.02- to 2.0-mm fraction of ashy part of particle-size control section; 12 to 17 percent clay in loamy-skeletal part of particle-size control section; formed in volcanic ash over colluvium and residuum derived from andesitic basalt
Ferguson--very deep (more than 150 cm); very fine sandy loam ash layer; 30 to 55 percent glass in 0.02- to 2.0-mm fraction of ashy part of particle-size control section; 2Bw horizon; 100 to 150 cm deep to 2C horizon of loamy coarse sand or sand (sandy-skeletal); formed in volcanic ash over dominantly granitic glaciofluvial deposits
Gutridge--deep (100 to 150 cm) to lithic contact; 60 to 90 percent glass in 0.02- to 2.0-mm fraction of ashy part of particle-size control section; subangular rock fragments in loamy-skeletal part; formed in volcanic ash over colluvium derived from metasedimentary rock
Honeyjones--not formed in till
Huckle--deep (100 to 150 cm) to paralithic contact (metasedimentary rock)
Stalter--moderately deep (50 to 100 cm) to paralithic contact (granite); 60 to 90 percent glass in 0.02- to 2.0-mm fraction of ashy part of particle-size control section; formed in volcanic ash over colluvium and residuum derived from granite
Thorton--fine sandy loam or sandy loam ash-influenced layers
Threecent--moderately deep (50 to 100 cm) to lithic contact; 60 to 90 percent glass in 0.02- to 2.0-mm fraction of ashy part of particle-size control section; 4 to 12 percent clay in loamy-skeletal part of particle-size control section; formed in volcanic ash over colluvium and residuum derived from metasedimentary rock
Twobit--moderately deep (50 to 100 cm) to lithic contact; 60 to 90 percent glass in 0.02- to 2.0-mm fraction in ashy part of particle-size control section; 18 to 27 percent clay in loamy-skeletal part of particle-size control section; formed in volcanic ash over colluvium and residuum derived from metavolcanic rock
GEOGRAPHIC SETTING:
Elevation--1340 to 1830 m
Climate--cold, wet winters; cool, moist summers
Mean annual precipitation--680 to 1420 mm
Mean annual soil temperature--2 to 6 degrees C
Frost-free period--25 to 80 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Lakefork--on recent till slopes; more than 35 percent rock fragments in upper part of particle-size control section
Nebo--on south aspects, moderately steep or steep slopes, and moraines that have mixed mineralogy; ash mantle less than 36 cm thick; argillic horizon; dry 45 to 60 days
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Saturation during normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--moderately high or high
USE AND VEGETATION:
Use--timber production, watershed, recreation, wildlife habitat
Native vegetation--grand fir, Engelmann spruce, Douglas-fir, ponderosa pine, western larch, lodgepole pine, northern twinflower, big huckleberry, western meadow-rue, heartleaf arnica, darkwoods violet, pathfinder, starry false Solomon's seal, baldhip rose, elk sedge, Columbia brome, prince's pine, sweet-scented bedstraw, Utah honeysuckle, low Oregon grape, sidebells wintergreen, sweetcicely, birchleaf spirea, pinegrass, northwestern sedge, grouse huckleberry
DISTRIBUTION AND EXTENT: Foothills of central Rocky Mountains and Blue Mountains; MLRA 10; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Wallowa-Whitman National Forest; 2012
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Ochric epipedon
*Cambic horizon--zones from 8 to 53 cm and 9 to 107 cm
*Particle-size control section--zone from 5 to 105 cm
National Cooperative Soil Survey
U.S.A.