LOCATION THREECABIN ORTentative Series
TAXONOMIC CLASS: Loamy-skeletal, isotic, frigid Vitrandic Haploxerepts
TYPICAL PEDON: Threecabin very gravelly ashy loam - forested, on a 70 percent north-facing slope at an elevation of 5,280 feet. (Colors are for moist soil unless otherwise noted.)
Oi--0 to 0.5 inch; slightly decomposed needles and twigs
AE--0.5 to 12 inches; brown (7.5YR 4/3) very gravelly ashy loam, brown (7.5YR 5/3) dry; weak to moderate fine granular structure; soft, very friable, nonsticky and nonplastic; common fine roots; many fine and common medium irregular pores; 35 percent gravel and 5 percent cobbles; slightly acid (pH 6.5); gradual smooth boundary. (5 to 17 inches thick)
Bw1--12 to 24 inches; brown (7.5YR 4/4) very gravelly ashy loam, brown (7.5YR 5/4) dry; moderate fine and medium subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; common fine and medium, and few coarse roots; few fine irregular, and few fine and medium tubular pores; 35 percent gravel and 5 percent cobbles; slightly acid (pH 6.5); gradual smooth boundary.
Bw2--24 to 31 inches; brown (7.5YR 4/4) very gravelly ashy loam, light brown (7.5YR 6/4) dry; moderate fine and medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; few fine and coarse, and common medium roots; few fine and medium tubular pores; 35 percent gravel and 10 percent cobbles; slightly acid (pH 6.1); gradual smooth boundary. (combined thickness of Bw1 and Bw2 horizons is 11 to 39 inches)
BC--31 to 45 inches; brown (7.5YR 5/4) very gravelly loam, light brown (7.5YR 6/4) dry; massive; slightly hard, friable, nonsticky and nonplastic; few fine and coarse, and common medium roots; common fine irregular pores; 35 percent gravel and 20 percent cobbles; slightly acid (pH 6.1); abrupt irregular boundary. (0 to 16 inches thick)
R--45 inches; basalt bedrock
TYPE LOCATION: Wallowa County, Oregon
Section 28 (SW1/4, NW1/4, SE1/4) T. 5 N., R. 47 E.
Latitude: 45 degrees, 52 minutes, 53 seconds North
Longitude: 116 degrees, 56 minutes, 30 seconds West
UTM coordinates: Zone 11; northing: 5,080,660.1; easting: 504,516.7; NAD27
USGS Quadrangle: Jim Creek Butte
RANGE IN CHARACTERISTICS:
Soil Temperature: frigid regime
Mean Annual Soil Temperature: 38 to 45 degrees F
Mean Summer Soil Temperature: 47 to 54 degrees F
Mean Winter Soil Temperature: 32 to 37 degrees F
Soil Moisture: xeric regime; dry 45 to 60 consecutive days in summer
Particle-size Control Section: 10 to 40 inches below mineral soil surface
Clay content, average: 11 to 17 percent
Rock fragment content, average: 35 to 55 percent
Diagnostic Horizons and Features:
vitrandic subgroup properties: upper boundary at the mineral soil surface; 24 to 44 inches thick
Al+1/2Fe (ammonium oxalate): 0.2 to 0.9 percent
P retention: 25 to 45 percent
glass content in the 0.02-2.0mm fraction: 15 to 30 percent
cambic horizon: 11 to 39 inches thick
lithic contact, depth below mineral soil surface: 40 to 60 inches
AE horizon; A, E or EB horizon in some pedons:
color, moist: 7.5YR 4/2, 4/3; 10YR 3/1, 4/2, 4/3
color, dry: 7.5YR 5/2, 5/3, 6/4; 10YR 4/3, 5/2, 5/3, 6/3
texture: GRV-ASHY-L, GR-ASHY-SIL, GR-ASHY-SL, GR-ASHY-L
clay content: 8 to 14 percent
rock fragments: 15 to 45 percent
gravel: 15 to 35 percent
cobbles: 0 to 5 percent
stones: 0 to 5 percent
reaction: slightly acid to neutral; pH: 6.1 to 7.3
Bw horizon:
color, moist: 7.5YR 4/4, 5/4; 10YR 4/3, 4/4, 5/3
color, dry: 7.5YR 5/4, 6/4; 10YR 5/3, 6/4
texture: CBV-ASHY-L, CBV-ASHY-SIL, CBV-ASHY-SL, GRV-ASHY-L
clay content: 12 to 17 percent
rock fragments: 35 to 55 percent
gravel: 25 to 35 percent
cobbles: 10 to 20 percent
stones: 0 to 10 percent
reaction: slightly acid; pH: 6.1 to 6.5
BC horizon; C horizon in some pedons:
color, moist: 7.5YR 5/4; 10YR 4/3, 4/4, 5/4
color, dry: 7.5YR 5/4, 6/4; 10YR 5/4, 6/4
texture: CBV-L, CBX-SIL, CBX-SL, GRX-L, GRV-L
clay content: 10 to 18 percent
rock fragments: 45 to 80 percent
gravel: 20 to 55 percent
cobbles: 15 to 30 percent
stones: 0 to 10 percent
reaction: slightly acid; pH: 6.1to 6.5
COMPETING SERIES:
Analulu -- moderately deep (20 to 40 inches) to a lithic contact (argillite); minor volcanic ash influence in upper 7 to 14 inches has 5 to 20 percent glass; particle-size control section averages 8 to 15 percent clay
Ardenvoir - moderately deep (20 to 40 inches) to a paralithic contact (metasedimentary siltstone or quartzite); dry 45 to 75 consecutive days in summer
Blinn - moderately deep (20 to 40 inches) to a lithic contact (basalt); minor influence of volcanic ash in upper 7 to 14 inches with 5 to 20 percent glass; particle-size control section averages 18 to 27 percent clay
Brevco - moderately deep (20 to 40 inches) to a lithic contact (granite); minor volcanic ash influence in upper 7 to 14 inches has 5 to 20 percent glass; particle-size control section averages less than 18 percent clay; dry 60 to 75 consecutive days in summer;
Coxit - very deep (lacks a lithic contact within 60 inches) formed in colluvium and residuum from metasedimentary lithology; particle-size control section averages 8 to 18 percent clay; dry 60 to 75 consecutive days in summer
Easte - deep (40 to 60 inches) to a paralithic contact (weathered andesite or basalt); umbric epipedon 40 to 60 inches thick; particle-size control section is 10 to 18 percent clay; dry greater than 90 consecutive days in summer
Highhorn - deep (40 to 60 inches) to a lithic contact (argillite); ash mantle 7 to 14 inches thick has 40 to 60 percent volcanic glass over buried Bwb horizons; particle-size control section averages 27 to 35 percent clay; dry for 45 to 75 consecutive days in summer
Huntrock - moderately deep (20 to 40 inches) to a lithic contact (argillite); volcanic ash mantle, 7 to 14 inches thick, has 40 to 60 percent glass; particle-size control section soils averages 27 to 35 percent clay; dry 50 to 75 consecutive days in summer
Jimbluff - very deep (lacks a lithic contact within 60 inches) formed in alluvium and till; particle-size control section averages 2 to 6 percent clay; dry 60 to 75 consecutive days in summer
Jumpe - very deep (lacks a lithic contact within 60 inches) formed in colluvium from basalt; particle-size control section averages 15 to 27 percent clay; dry 60 to 75 consecutive days in summer
Kamela - moderately deep (20 to 40 inches) to a lithic contact (basalt); volcanic ash mixed in colluvium 7 to 14 inches thick with 20 to 40 percent volcanic glass; particle-size control section averages 18 to 27 percent clay
Lekrem - deep and very deep (40 to greater than 60 inches to a lithic contact (granite); formed in colluvium and glacial till from granitic rock; particle-size control section averages 3 to 8 percent clay; dry 60 to 75 consecutive days in summer
Longort - moderately deep (20 to 40 inches) to a densic contact (till)
Noil - moderately deep (20 to 40 inches) to a paralithic contact (schist); 2 to 4 percent mica flakes throughout; dry 45 to 70 consecutive days in summer
Ontrail - very deep (lacks a lithic contact within 60 inches), formed in colluvium and till; particle-size control section soils averages 5 to 12 percent clay; dry 60 to 75 consecutive days in summer
Radercreek deep (40 to 60 inches) to a lithic contact (sandstone); minor influence of volcanic ash in upper 7 to 24 inches has 5 to 20 percent glass; particle-size control section is less than 18 percent clay; dry for 60 to 75 consecutive days in summer
Redpeak - moderately deep (20 to 40 inches) to a lithic contact (sandstone); soils have hues of 5YR and 2.5YR; dry 60 to 75 consecutive days in summer
Santop - moderately deep (20 to 40 inches) to a lithic contact (sandstone); minor volcanic ash influence in upper 7 to 14 inches has 5 to 20 percent glass; particle-size control section averages 5 to 15 percent clay; dry for 60 to 75 consecutive days in summer
Seeburg - very deep (lacks a lithic contact within 60 inches), formed in tuffaceous sandstone colluvium; particle-size control section averages 4 to 7 percent clay; dry 60 to 75 consecutive days in summer
Thout - moderately deep (20 to 40 inches) to a lithic contact (andesite); minor volcanic ash influence in upper 7 to 14 inches has 5 to 20 percent glass; particle-size control section averages 4 to 14 percent clay; dry 60 to 75 consecutive days in summer
Warfield - deep and very deep (40 to 80 inches) to a lithic contact (granitic rock); volcanic ash mantle, 7 to 14 inches thick has 30 to 55 percent glass; particle-size control section averages 7 to 11 percent clay; moderately acid or strongly acid in substratum
GEOGRAPHIC SETTING:
Landform: backslopes of mountains and dissected plateaus
Slope gradient: 15 to 90 percent
Parent material: Mazama volcanic ash mixed in colluvium
Lithology: basalt
Elevation: 4,000 to 6,200 feet
Climate: cold, wet winters and warm, dry summers
Mean annual precipitation: 20 to 30 inches
Mean annual air temperature: 36 to 43 degrees F
Frostfree period: 25 to 80 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Fivebeaver: on plateaus and backslopes; shallow to basalt; minor influence of volcanic ash in loamy-skeletal colluvium; under ponderosa pine, Douglas-fir, common snowberry and mallow ninebark
Fivebit: on plateaus and backslopes; shallow to basalt; minor influence of volcanic ash in loamy-skeletal colluvium; under western juniper with scattered ponderosa pine and big sagebrush, Idaho fescue and bluebunch wheatgrass
Getaway: on mountain backslopes and canyon walls; deep to basalt with mollic epipedon and loamy-skeletal argillic horizon; under Douglas-fir, ponderosa pine, mallow ninebark, common snowberry and elk sedge
Harl: on plateau sideslopes; very deep; thick skeletal ash mantle over skeletal buried eluvial and cambic horizons; under grand fir, western larch, longtube twinflower, prince's pine, and big huckleberry
Kamela: on ridge crests and shoulder slopes; moderately deep to basalt with a mixed mantle of ash and loess over loamy-skeletal colluvium; under grand fir, Douglas-fir, rocky mountain maple, ninebark, and prince's pine.
DRAINAGE AND PERMEABILITY:
Drainage: well drained
Permeability: moderate
USE AND VEGETATION:
Use: watershed, wildlife habitat, timber production, livestock grazing and recreation.
Potential native vegetation: grand fir, western larch, Douglas-fir, common snowberry, mallow ninebark, birchleaf spiraea, heartleaf arnica, Idaho goldthread, and pinegrass.
Plant association: ABGR/CARU (grand fir/pinegrass); may include: ABGR/COOC (grand fir/Idaho goldthread)
DISTRIBUTION AND EXTENT:
Distribution: MLRA: 43c; Blue Mountains of northeastern Oregon
Extent: small
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Wallowa-Whitman National Forest, Oregon 2008. Name is from a ridge.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
ochric epipedon: 0.5 to 12 inches; AE horizon
cambic horizon: 12 to 31 inches; Bw1, Bw2 horizons
vitrandic subgroup feature: 0.5 to 31 inches; AE, Bw1, Bw2 horizons
lithic contact: 45 inches; R horizon
particle-size control section: 10 to 40 inches; AE, Bw1, Bw2, BC horizons