LOCATION TYEECREEK ORTentative Series
TAXONOMIC CLASS: Ashy over loamy-skeletal, amorphic over isotic Alfic Vitricryands
TYPICAL PEDON: Tyeecreek ashy silt loam, woodland, on an 18 percent north-facing slope at an elevation of 5,470 feet. (Colors are for moist soil unless otherwise noted.)
Oi--0 to 1 inches; needles and twigs
A--1 to 5 inches; dark brown (10YR 3/3) ashy silt loam, yellowish brown (10YR 5/4) dry; weak medium subangular blocky structure parting to weak fine and very fine subangular blocky; soft, very friable, nonsticky and nonplastic; common very fine, fine and medium roots; common very fine and few fine irregular pores; 5 percent gravel and 5 percent cobbles; moderately acid (pH 5.8); clear wavy boundary. (1 to 4 inches thick)
Bw--5 to 15 inches; dark yellowish brown (10YR 4/4) gravelly ashy silt loam, light yellowish brown (10YR 6/4) dry; weak medium subangular blocky structure parting to weak fine subangular blocky; soft, very friable, nonsticky and nonplastic; few fine spherical concretions; common very fine and fine, and few medium and coarse roots; common very fine and few fine irregular, and few very fine tubular pores; 10 percent gravel and 5 percent cobbles; slightly acid (pH 6.2); clear wavy boundary. (10 to 13 inches thick)
2AEb--15 to 26 inches; dark brown (7.5YR 3/3) very gravelly loam, brown (7.5YR 5/3) dry; weak fine and very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine, fine and medium roots; common very fine and fine irregular, and common very fine tubular pores; 25 percent gravel and 10 percent cobbles; slightly acid (pH 6.2); clear wavy boundary. (5 to 21 inches thick)
2Btb1--26 to 43 inches; brown (7.5YR 4/4) very gravelly sandy clay loam, brown (7.5YR 5/4) dry; weak medium structure parting to weak fine and very fine subangular blocky; hard, friable, slightly sticky and moderately plastic; few very fine roots; common very fine irregular and tubular pores; few faint clay films on ped faces; 30 percent gravel and 10 percent cobbles; neutral (pH 7.0); gradual smooth boundary. (5 to 21 inches thick)
2Btb2--43 to 61 inches; dark yellowish brown (10YR 4/4) very gravelly clay loam, brown (7.5YR 5/4) dry; weak medium structure parting to weak fine and very fine subangular blocky; hard, firm, moderately sticky and moderately plastic; few very fine tubular roots; common very fine irregular pores; common faint clay films on ped faces; 35 percent gravel and 10 percent cobbles; neutral (pH 7.0).
TYPE LOCATION:
Grant County, Oregon, Section 34, T. 7 S., R. 35.5 E.
UTM Zone 11; 4973780 northing; 388450 easting
Latitude: 44 degrees, 54 minutes, 31 seconds
Longitude: 118 degrees, 24 minutes, 47 seconds
RANGE IN CHARACTERISTICS:
Soil Temperature: cryic regime
Mean Annual Soil Temperature: 38 to 41 degrees F
Mean Summer Soil Temperature: 44 to 48 degrees F
Mean Winter Soil Temperature: 32 to 36 degrees F
Soil Moisture: udic regime, dry 30 to 45 days in summer
Particle-size Control Section: mineral surface to 40 inches below the mineral surface
Upper part (ashy): 14 to 17 inches thick
Clay content: 2 to 8 percent
Rock fragment content: 5 to 30 percent
Lower part (loamy-skeletal): 23 to 26 inches thick
Clay content: 15 to 30 percent
Rock fragment content: 35 to 65 percent
Rock fragment shape: rounded to subrounded
Diagnostic Horizons and Features:
andic soil properties: upper boundary at the mineral soil surface; 14 to 15 inches thick
Al+1/2Fe(aox): 1.5 to 3.0 percent
bulk density: 0.65 to 1.00 g/cc
P retention: 60 to 90 percent
0.02-2.0 mm fraction: 40 to 60 percent of < 2 mm fraction
glass content in the 0.02-2.0 mm fraction: 60 to 90 percent
water content at 1500 kPa tension (air dried): 5 to 12 percent
8Si + 2Fe: 5 to 12 percent
8Si - 2Fe: 4 to 8 percent
ochric epipedon: 1 to 4 inches thick
cambic horizon: 10 to 13 inches thick
argillic horizon: 10 to 39 inches thick
lithic contact depth: more than 60 inches
Major Horizons:
A horizon (AB in some pedons)
color, moist: 7.5YR 3/3; 10YR 3/3, 3/4
color, dry: 7.5YR 4/4, 5/3, 5/4; 10YR 5/4, 6/4
texture: ASHY-SIL
clay content: 3 to 8 percent
rock fragment content: 0 to 10 percent
gravel: 0 to 5 percent
cobbles: 0 to 5 percent
reaction: moderately acid to slightly acid, pH: 5.8 to 6.5
base saturation (sum of bases): 25 to 75 percent
organic matter: 3 to 10 percent
Bw horizon (BC in some pedons)
color, moist: 7.5YR 3/4; 10YR 3/6, 4/4, 4/6
color, dry: 7.5YR 5/4; 10YR 6/4, 7/4
texture: ST-ASHY-SIL, GR-ASHY-SIL, ASHY-SIL, BY-ASHY-SIL
clay content: 2 to 8 percent
rock fragment content: 5 to 30 percent
gravel: 0 to 10 percent
cobbles: 0 to 10 percent
stones: 0 to 15 percent
boulders: 0 to 5 percent
reaction: slightly acid or neutral, pH: 6.0 to 6.6
base saturation (sum of bases): 45 to 75 percent
organic matter: 1 to 3 percent
2AEb horizon (2Eb or 2EBb in some pedons)
color, moist: 7.5YR 3/3, 3/4, 4/4; 10YR 3/6, 4/2
color, dry: 7.5YR 4/3, 5/3; 10YR 5/4, 6/2, 6/4
texture: CBV-SIL, GRV-L, STV-SIL, GRV-SL, CBV-SCL
clay content: 8 to 26 percent
rock fragment content: 35 to 60 percent
gravel: 15 to 25 percent
cobbles: 10 to 25 percent
stones: 0 to 15 percent
boulders: 0 to 5 percent
reaction: slightly acid or neutral; pH: 6.2 to 6.8
base saturation (sum of bases): 70 to 85 percent
2Btb horizons (2BC or 2C in some pedons)
color, moist: 7.5YR 3/3, 3/4, 4/4, 5/3; 10YR 3/3, 3/4, 4/3, 4/4
color, dry: 7.5YR 4/4, 5/4; 10YR 4/4, 5/4
texture: GRV-SCL, GRV-CL, CBV-SIL, CBV-SICL, CBX-SC, CBX-SICL, STX-L, STV-SIL
clay content: 19 to 35 percent
rock fragment content: total 40 to 70 percent
gravel: 15 to 40 percent
cobbles: 5 to 25 percent
stones: 0 to 25 percent
boulders: 0 to 5 percent
reaction: slightly acid or neutral, pH: 6.4 to 7.0
base saturation (sum of bases): 75 to 85 percent
COMPETING SERIES:
Tyeecreek (T)--very deep; ashy part of the pscs is ashy silt loam with 60 to 90 percent glass, and 5 to 30 percent rounded to subrounded gravel, cobbles and stones; argillic horizon has 19 to 35 percent clay; formed in volcanic ash over till from basalt
Bott--very deep, ashy part of the pscs is ashy sandy loam with 15 to 25 percent pumice and 5 to 25 percent gravel, argillic horizon has 10 to 20 percent clay, formed in volcanic ash and pumice over colluvium and residuum from volcanic rocks
Webbridge--deep to a lithic contact, ashy part of the pscs is ashy silt loam with 25 to 45 percent volcanic glass and 0 to 25 percent fine gravel, argillic horizon has 18 to 32 percent clay, formed in volcanic ash over colluvium from basalt
GEOGRAPHIC SETTING:
Landform: midslopes of lateral moraines on glaciated mountains
Slope gradient: 0 to 60 percent
Parent material: volcanic ash over till derived primarily from basalt
Lithology: basalt
Elevations: 5,400 to 6,400 feet
Climate: cold, wet winters and warm, dry summers
Mean annual precipitation: 30 to 46 inches
Mean annual temperature: 36 to 39 degrees F.
Frost-free period: 25 to 65 days.
GEOGRAPHICALLY ASSOCIATED SOILS:
Bata-occur on steep slopes of moraines rich in soft sediments or old till; less than 14 inch volcanic ash mantle
Bucketlake-occur with till that has more granite dominance; buried cambic instead of argillic
Fivebit-occur on convex positions of steep glaciated slopes; 10 to 20 inches to bedrock
Hasshollow (T)-occur on recent lateral moraines dominated by basalt; greater than 35 percent rock fragments in the volcanic ash mantle
Lostcamp (T)-occur on recent glacial moraines with granite dominated till, greater than 35 percent rock fragments in volcanic ash mantle
Mudlakebasin (T)-occur near heads of cirque basins and on scoured slopes of glaciated ground; 20 to 40 inches to bedrock
Nebo (T)-occur on steeper slopes of lower elevations and south aspects and have less than 14 inches of volcanic ash influence
DRAINAGE AND PERMEABILITY:
Drainage: well drained
Permeability: moderate
USE AND VEGETATION:
Use: watershed, wildlife habitat, timber production, livestock grazing and recreation
Native vegetation: subalpine fir, western larch, Douglas fir, lodgepole pine, grouse whortleberry, big huckleberry, longtube twinflower, prince's pine, Utah honeysuckle, lupine, heartleaf arnica, roundleaf violet, pinegrass, northwest sedge and Ross sedge
Ecological site: PICO(ABLA)/VASC; may include PICO(ABLA)/VAME, ABLA/VAME and ABLA/LIBOL2
DISTRIBUTION AND EXTENT:
MLRA- E43
Distribution- Blue Mountains of northeastern Oregon
Extent- limited extent
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Grant County, Oregon 2003. The name is from a stream in the Big Sheep Creek drainage of the Wallowa Mountains in Wallowa County.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
ochric epipedon 1 to 5 inches A
cambic horizon 5 to 15 inches Bw
argillic horizon 26 to 61 inches 2Btb1, 2Btb2
andic soil material 0 to 15 inches A, Bw
particle-size control section
ashy part: 1 to 15 inches A, Bw
loamy-skeletal part: 15 to 41 inches 2Eb, 2Btb1