LOCATION STALTER ORTentative Series
TAXONOMIC CLASS: Ashy over loamy-skeletal, amorphic over isotic, frigid Typic Udivitrands
TYPICAL PEDON: Stalter ashy silt loam - woodland, on a 50 percent north-facing slope at an elevation of 4,270 feet. (Colors are for moist soil unless otherwise noted. Soil textures are apparent field textures.)
Oi--0 to 1 inches; needles, grasses, and woody debris
Oe--1 to 2 inches; moderately decomposed needles, grasses, and woody debris
A--2 to 9 inches; very dark grayish brown (10YR 3/2) ashy silt loam, brown (10YR 5/3) dry; weak very fine granular structure; soft, very friable, nonsticky, nonplastic and weakly smeary; common very fine and common fine roots; common very fine irregular pores; 5 percent gravel; slightly acid (pH 6.5); clear smooth boundary. (2 to 7 inches thick)
Bw--9 to 19 inches; dark yellowish brown (10YR 3/4) ashy silt loam, light yellowish brown (10YR 6/4) dry; weak fine subangular blocky structure parting to very fine granular; soft, very friable, nonsticky, nonplastic and weakly smeary; common very fine and common fine and few medium roots; common very fine irregular pores; 10 percent gravel; slightly acid (pH 6.5); clear smooth boundary. (7 to 13 inches thick)
2Eb--19 to 21 inches; dark grayish brown (10YR 4/2) very gravelly sandy loam, light brownish gray (10YR 6/2) dry; weak fine subangular blocky structure parting to weak very fine granular; loose, very friable, nonsticky and nonplastic; common very fine and fine, and few medium roots; common very fine and fine irregular pores; 40 percent gravel; neutral (pH 6.6); clear wavy boundary. (3 to 17 inches thick)
2Bwb--21 to 35 inches; dark grayish brown (10YR 4/2) very gravelly sandy loam, light brownish gray (10YR 6/2) dry; weak medium subangular blocky structure parting to weak fine granular; loose, very friable, nonsticky and nonplastic; few, faint clay films occur as bridges holding mineral grains together; few very fine, and common fine and medium roots; common very fine and fine irregular pores; 45 percent gravel; neutral (pH 6.6); clear wavy boundary. (10 to 21 inches thick)
2Cr--35 inches; grus
TYPE LOCATION: Grant County, Oregon
Section 19 (NW , SE , SW ), T. 9 S., R. 33 E.
Latitude: 44 degrees, 45 minutes, 51 seconds N
Longitude: 118 degrees, 47 minutes, 26 seconds W
UTM Zone 11; 4,958,320 northing; 358,280 easting
USGS Quadrangle: Sharp Ridge
RANGE IN CHARACTERISTICS:
Soil Temperature: frigid regime
Mean Annual Soil Temperature: 39 to 44 degrees F
Mean Summer Soil Temperature: 46 to 53 degrees F
Mean Winter Soil Temperature: 32 to 37 degrees F
Soil Moisture: udic regime, dry 35 to 45 days in summer
Particle-size Control Section: mineral surface to top of the paralithic contact
Upper part (ashy): 14 to 17 inches thick
Clay content: 1 to 6 percent
Rock fragment content: 0 to 11 percent
Lower part (loamy-skeletal): 15 to 24 inches thick
Clay content: 3 to 15 percent
Rock fragment content: 35 to 50 percent
Diagnostic Horizons and Features:
andic soil properties: upper boundary at the mineral surface; 14 to 17 inches thick
Al+1/2Fe(aox): 1.0 to 3.0 percent
bulk density: 0.65 to 1.0 g/cc
P retention: 40 to 90 percent
0.02-2.0 mm fraction: 40 to 60 percent of fine earth
glass content in the 0.02-2.0 mm fraction: 60 to 90 percent
water content at 1500 kPa (air dried): 5 to 12 percent
8Si + 2Fe (aox): 5 to 12 percent
8Si - 2Fe (aox): 4 to 8 percent
ochric epipedon: 2 to 7 inches thick
cambic horizons:
upper: 7 to 13 inches thick
lower: 10 to 21 inches thick
paralithic contact depth: 20 to 40 inches from top of mineral soil surface
Major Horizons:
A horizon
color, moist: 7.5YR 3/3, 3/4; 10YR 3/2, 3/4
color, dry: 7.5YR 5/4; 10YR 5/3, 5/4, 6/3
texture: ASHY-SIL
clay content: 1 to 6 percent
rock fragment content: 0 to 5 percent
gravel: 0 to 5 percent
reaction: slightly acid to neutral; pH: 6.1 to 7.3
base saturation: 45 to 75 percent (by the sum of bases)
organic carbon: 1 to 5 percent
Bw horizon
color, moist: 7.5YR 4/4; 10YR 3/4, 4/4, 5/6
color, dry: 7.5YR 6/4; 10YR 6/4, 7/3, 7/4
texture: ASHY-SIL
clay content: 1 to 6 percent
rock fragment content: 0 to 12 percent
gravel: 0 to 10 percent
cobbles: 0 to 2 percent
reaction: slightly acid to neutral; pH: 6.1 to 7.3
base saturation: 60 to 75 percent (by the sum of bases)
organic carbon: 0.6 to 1.0 percent
2Eb horizon
color, moist: 7.5YR 4/4; 10YR 3/3, 3/4, 4/2
color, dry: 7.5YR 6/4; 10YR 5/3, 6/2, 6/3
texture: GRV-SL, GR-LS, GRV-L, GRV-LS, GR-SL
clay content: 3 to 15 percent
rock fragment content: 25 to 40 percent
gravel: 15 to 40 percent
cobbles: 0 to 15 percent
reaction: slightly acid to neutral; pH: 6.1 to 7.3
2Bwb horizon
color, moist: 7.5YR 4/3, 4/6, 5/6; 10YR 3/4, 4/2, 4/3
color, dry: 7.5YR 6/4; 10YR 5/3, 6/2, 6/3, 6/4
texture: GRV-SL, CBV-SL
clay content: 3 to 15 percent
rock fragment content: 40 to 55 percent
gravel: 25 to 45 percent
cobbles: 0 to 15 percent
stones: 0 to 5 percent
reaction: slightly acid to neutral; pH: 6.1 to 7.3
COMPETING SERIES:
Stalter (T) -- moderately deep (20 to 40 inches) to a paralithic contact of weathered granite; ashy part of the pscs has 60 to 90 percent glass in the 0.02 to 2.0 mm fraction; formed in volcanic ash over colluvium and residuum from granite
Boulderjud -- deep (40 to 60 inches) to a paralithic contact of weathered granite; ashy part of the pscs has 30 to 65 percent glass in the 0.02 to 2.0 mm fraction; has 2Bt horizons below the ash mantle; formed in coarse-silty volcanic ash over colluvium and residuum from granitic rocks
Bulgar (T) -- very deep (>60 inches); ashy part of the pscs has 60 to 90 percent glass in the 0.02 to 2.0 mm fraction; ash mantle with greater than 5 percent rounded rock fragments; has 2EBb, 2Ab, 2AEb, or 2Eb buried surface horizon below the ash mantle; loamy-skeletal throughout the series control section (to 80 inches); glacial rock fragments in lower pscs are rounded; formed in volcanic ash over, mostly granitic, till
Bullroar (T) -- very deep (>60 inches); ashy part of the pscs has 60 to 90 percent glass in the 0.02 to 2.0 mm fraction; ash mantle with less than 5 percent rounded rock fragments; texture in 2BC horizon is loam, sandy loam or loamy sand (loamy-skeletal); has 2EBb, 2ACb, or 2Eb buried surface horizon below the ash mantle; coarse sand and gravel in lower part of series control section (60 to 80 inches); rounded alluvial fragments in lower pscs; formed in volcanic ash over mixed alluvium
Deardorf (T) -- moderately deep (20 to 40 inches) to a lithic contact; ashy part of the pscs has 60 to 90 percent glass in the 0.02 to 2.0 mm fraction; loamy-skeletal part of pscs has 12 to 17 percent clay; formed in volcanic ash over colluvium and residuum from andesitic basalt
Ferguson -- very deep (>60 inches); texture of ash is very fine sandy loam; ashy part of the pscs has 30 to 55 percent glass in the 0.02 to 2.0 mm fraction; has 2Bw horizon; depth to 2C horizon with loamy coarse sand or sand (sandy-skeletal) is 40 to 60 inches; formed in volcanic ash over, mostly granitic, glaciofluvial deposits
Gutridge (T) -- deep (40 to 60 inches) to a lithic contact; ashy part of the pscs has 60 to 90 percent glass in the 0.02 to 2.0 mm fraction; rock fragments in the loamy-skeletal part are subangular; formed in volcanic ash over colluvium from metasedimentary rock
Threecent (T) -- moderately deep (20 to 40 inches) to a lithic contact; ashy part of the pscs has 60 to 90 percent glass in the 0.02 to 2.0 mm fraction; loamy-skeletal part of pscs has 4 to 12 percent clay; formed in volcanic ash over colluvium and residuum from metasedimentary rock
Twobit (T) -- moderately deep (20 to 40 inches) to a lithic contact; ashy part of the pscs has 60 to 90 percent glass in the 0.02 to 2.0 mm fraction; loamy-skeletal part of pscs has 18 to 27 percent clay; formed in volcanic ash over colluvium and residuum from metavolcanic rock
Similar soils with mixed mineralogy.
Bonnash -- very deep (>60 inches); ashy part of the pscs has 5 to 30 percent glass in the 0.02 to 2.0 mm fraction; has 2E/Bw horizon; depth to 2C horizon with loamy coarse sand (sandy-skeletal) is 25 to 45 inches, formed in volcanic ash over mixed alluvium or glaciofluvial deposits
Bouldercreek -- very deep (>60 inches); ashy part of the pscs has 15 to 65 percent glass in the 0.02 to 2.0 mm fraction; Bw horizon has 0 to 25 percent subangular rock fragments; has 2BC and 2C horizons below the ash mantle that contain mica flakes; formed in volcanic ash and loess over colluvium from schist, gneiss, granitic or quartzite bedrock
Dewberry -- very deep (>60 inches); ashy part of the pscs has 12 to 20 percent glass in the 0.02 to 2.0 mm fraction; texture in 2C horizon is sandy loam (loamy-skeletal), does not have 2EBb, 2ACb, or 2Eb buried surface horizon below the ash mantle; formed in volcanic ash over mixed alluvium
Stevie -- very deep (>60 inches); ashy part of the pscs has 12 to 20 percent glass in the 0.02 to 2.0 mm fraction; Bw horizon has 15 to 30 percent rock fragments; has 2E/Bw horizon below the ash mantle, excessively drained; formed in volcanic ash over colluvium
GEOGRAPHIC SETTING:
Landform: convex lower backslopes, planer mid to upper backslopes, and concave positions on shoulders and summits of mountains
Slope gradient: 0 to 90 percent
Parent material: volcaniclastic volcanic ash over colluvium and residuum
Lithology: Mazama ash over granite
Elevations: 4,200 to 6,000 feet
Climate: cold, wet winters and cool, moist summers
Mean annual precipitation: 28 to 39 inches
Mean annual air temperature: 37 to 42 degrees F
Frost-free period: 30 to 80 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Gorhamgulch (T): occur on concave to planar mid to lower backslopes of mountains; >60 inches to bedrock; has <35 percent rock fragments in lower part of pscs
Roundmeadow (T): occur on planar to convex mid to upperbackslopes of mountains; 20 to 40 inches to paralithic contact; <14 inch ash mantle; <35 percent rock fragments in lower part of pscs
DRAINAGE AND PERMEABILITY:
Drainage: well drained
Permeability: moderately rapid
USE AND VEGETATION:
Use: timber production, watershed, wildlife habitat, recreation, and livestock grazing
Native vegetation: grand fir, Englemann spruce, Douglas fir, lodgepole pine, longtube twin flower, big huckleberry, grouse huckleberry, darkwoods violet, broadpetal strawberry, pinegrass, elk sedge, northwest sedge and western fescue.
Ecological site: Dominant: ABGR/LIBOL2; others may include: PICO(ABGR)/VAME/CARU
DISTRIBUTION AND EXTENT:
MLRA - E43c
Distribution: Central Blue Mountains of northeastern Oregon
Extent: small
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Grant County, Oregon 2003. Name is derived from a mine.
REMARKS: Diagnostic horizons and features recognized in this pedon (97-2825) are:
ochric epipedon 2 to 9 inches (A horizon)
cambic horizons:
upper: 9 to 19 inches (Bw horizon)
lower: 21 to 35 inches (2Bwb horizon)
particle-size control section:
ashy part: 2 to 19 inches (A and Bw horizons)
loamy-skeletal part: 19 to 35 inches (2Eb and 2Bwb horizons)
paralithic contact: 35 inches (2Cr layer)