LOCATION MUDLAKEBASIN ORTentative Series
TAXONOMIC CLASS: Ashy over loamy-skeletal, amorphic over isotic Typic Vitricryands
TYPICAL PEDON: Mudlakebasin ashy silt loam - woodland, on a 12 percent north-facing slope at an elevation of 7,190 feet. (Colors are for moist soil unless otherwise noted. All textures are apparent field textures.)
Oi--0 to 0.5 inches; needles and twigs.
A--0.5 to 4 inches; dark yellowish brown (10YR 3/4) ashy silt loam, brown (10YR 4/3) dry; weak fine granular structure; soft, very friable, slightly sticky, slightly plastic and weakly smeary; common fine and few medium roots; few fine tubular pores; moderately acid (pH 5.7); clear wavy boundary. (3 to 8 inches thick)
Bw--4 to 11 inches; dark yellowish brown (10YR 3/4) ashy silt loam, yellowish brown (10YR 5/4) dry; weak fine and very fine subangular blocky structure; soft, friable, slightly sticky, slightly plastic and weakly smeary; common fine, medium and coarse roots; common fine irregular pores; moderately acid (pH 5.7); clear wavy boundary. (7 to 21 inches thick)
BC--11 to 22 inches; yellowish brown (10YR 5/8) ashy silt loam, very pale brown (10YR 7/4) dry; moderate fine and medium subangular blocky structure; slightly hard, firm, slightly sticky, slightly plastic and weakly smeary; few fine and medium roots; few irregular pores; neutral (pH 7.0); abrupt wavy boundary. (0 to 11 inches thick)
2Bw--22 to 29 inches; dark yellowish brown (10YR 4/4) very gravelly sandy loam, light yellowish brown (10YR 6/4) dry; weak fine subangular blocky structure parting to weak very fine subangular; soft, friable, slightly sticky and nonplastic; few fine roots; few fine irregular pores; 35 percent gravel; moderately acid (pH 6.0); gradual smooth boundary. (3 to 16 inches thick)
2BC--29 to 39 inches; dark yellowish brown (10YR 4/4) very gravelly sandy loam, light yellowish brown (10YR 6/4) dry; weak very fine subangular blocky structure; soft, friable, slightly sticky and nonplastic; few fine roots; few fine irregular pores; 40 percent gravel; slightly acid (pH 6.2); clear smooth boundary. (0 to 18 inches thick)
2R--39 inches; granite bedrock.
TYPE LOCATION: Union County, Oregon
Section 11 (SW 1/4, SW 1/4, NE 1/4), T. 5 S., R. 42 E.
Latitude: 45 degrees, 08 minutes, 40 seconds N
Longitude: 117 degrees, 31 minutes, 35 seconds W
USGS Quadrangle: China Cap
RANGE IN CHARACTERISTICS:
Soil Temperature: cryic regime
Mean Annual Soil Temperature: 35 to 41 degrees F
Mean Summer Soil Temperature: 41 to 49 degrees F
Mean Winter Soil Temperature: 28 to 36 degrees F
Soil Moisture: udic regime, dry 30 to 45 days in summer
Particle-size Control Section: mineral soil surface to lithic contact
Upper part (ashy): 15 to 29 inches thick
Clay content: 4 to 18 percent
Rock fragment content: 0 to 30 percent
Lower part (loamy-skeletal): 10 to 19 inches thick
Clay content: 4 to 18 percent
Rock fragment content: 35 to 80 percent
Rock fragment shape: subrounded to well rounded
Diagnostic Horizons and Features:
andic soil properties: upper boundary at the mineral soil surface; 15 to 29 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 fine earth fraction
glass content in the 0.02-2.0 mm fraction: 60 to 90 percent
water content at 1500 kPa tension (air dry soil): 5 to 12 percent
8Si + 2Fe(aox): 5 to 12 percent
8Si - 2Fe(aox): 4 to 8 percent
ochric epipedon: 3 to 8 inches thick
cambic horizon: upper part: 7 to 21 inches thick
lower part: 6 to 16 inches thick
lithic contact depth: 20 to 40 inches
Major Horizons:
A horizon
color, moist: 10YR 3/3, 3/4
color, dry: 10YR 4/3, 4/4, 5/3, 5/4
texture: ASHY-SIL, GR-ASHY-SIL, ST-ASHY-SIL
clay content: 5 to 10 percent
rock fragment content: 0 to 30 percent
gravel: 0 to 20 percent
cobbles: 0 to 5 percent
stones: 0 to 15 percent
reaction: strongly acid to moderately acid; pH: 5.1 to 6.0
base saturation (sum of bases): 5 to 25 percent
organic matter: 3 to 10 percent
Bw horizon
color, moist: 10YR 3/4, 3/6, 4/4, 4/6
color, dry: 10YR 5/4, 5/6, 6/6
texture: ASHY-SIL, ST-ASHY-SIL, GR-ASHY-SIL
clay content: 5 to 10 percent
rock fragment content: 0 to 30 percent
gravel: 0 to 25 percent
cobbles: 0 to 5 percent
stones: 0 to 25 percent
reaction: moderately acid; pH: 5.6 to 6.5
base saturation (sum of bases): 2 to 10 percent
organic matter: 1 to 5 percent
BC Horizon
color, moist: 10YR 5/6, 5/8
color, dry: 10YR 7/4, 7/6, 8/4
texture: ASHY-SIL, ST-ASHY-SIL
clay content: 5 to 10 percent
rock fragment content: 0 to 35 percent
gravel: 0 to 5 percent
cobbles: 0 to 10 percent
stones: 0 to 30 percent
reaction: slightly acid to neutral; pH: 6.1 to 7.3
base saturation (sum of bases): 35 to 50 percent
2Bw Horizon
color, moist: 7.5YR 4/4; 10YR 4/4, 5/4
color, dry: 7.5YR 6/4; 10YR 6/4, 6/6, 8/3
texture: STV-SL, STV-L, STX-COSL, CBX-COSL, GRV-SL
clay content: 10 to 18 percent
rock fragment content: 35 to 75 percent
gravel: 15 to 30 percent
cobbles: 0 to 25 percent
stones: 0 to 30 percent
reaction: moderately acid to slightly acid; pH: 5.6 to 6.5
base saturation (sum of bases): 40 to 60 percent
2BC Horizon
color, moist: 10YR 4/4, 5/3
color, dry: 2.5Y 7/2; 10YR 5/4, 6/4
texture: GRV-SL, STV-SL, CBX-SL
clay content: 10 to 18 percent
rock fragment content: 35 to 60 percent
gravel: 15 to 35 percent
cobbles: 0 to 20 percent
stones: 0 to 20 percent
reaction: moderately acid to slightly acid; pH: 5.6 to 6.5
COMPETING SERIES:
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, and clay content of 4 to 18 percent, formed in volcanic ash over till from granite
Angelpeak-deep (40 to 60 inches) to a lithic contact, loamy-skeletal part of pscs is slightly acid or neutral and has 60 to 85 percent angular rock fragments, formed in volcanic ash over colluvium from argillite
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 and 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 fragments and clay content of 5 to 15 percent, 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, ashy part of the pscs is stony ashy silt loam with more than 50 percent silt, loamy-skeletal part of pscs has rounded or well rounded rock fragments, formed in volcanic ash over till from granite
Lackeyshole (T)-deep (40 to 60 inches) to a lithic contact, loamy-skeletal part of pscs is slightly acid or neutral and has 35 to 55 percent subangular rock fragments and less than 25 percent very coarse, coarse and medium sand, 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, more than 25 percent very coarse, coarse and medium sand, and clay content of 5 to 10 percent; 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 and clay content of 18 to 30 percent, formed in volcanic ash over colluvium from basalt
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, less than 25 percent very coarse, coarse and medium sand, 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, loamy-skeletal part of pscs is strongly acid to slightly acid, and has 35 to 60 percent subrounded or subangular rock fragments and more than 25 percent very coarse, coarse and medium sand, formed in volcanic ash over colluvium from granite and granodiorite
GEOGRAPHIC SETTING:
Landform: glacial valley floors and cirque basins
Slope gradient: 15 to 30 percent
Parent material: volcanic ash over till from granite
Lithology: granite
Elevations: 5,200 to 7,200 feet
Climate: cold, moist winters and cool, moist summers
Mean annual precipitation: 30 to 55 inches
Mean annual air temperature: 33 to 39 degrees F
Frost-free period: 20 to 70 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Angell (T)-occurs on convex mid to upper slopes of lateral moraines; ash mantle is less than 14 inches thick
Bucketlake-occurs on planar to concave, mid to lower slopes and valley floors of glacial moraines, soil depth is greater than 60 inches
Clarkscreek(T) -occurs on convex to planar, mid to lower slopes and valley floors of glacial moraines; ash mantle is less than 14 inches thick
Digit (T)-occurs on concave to planar, glacial valley floors, near stream channels; depth is greater than 60 inches; has less than 35 percent rock fragments in lower part of pscs
Ducklake (T)-occurs on planar to concave, mid to lower slopes and valley floors of glacial moraines; soil is greater than 40 inches to a densic contact
Lostcamp (T)-occurs on planar to concave, lateral moraines and glacial valley floors; greater than 35 percent rock fragments in the upper portion of pscs; soil depth is greater than 60 inches
Marblepoint (T)-occurs on steeper slopes of lateral moraines where the ash mantle is less than 14 inches thick
Moodybasin (T)-occurs on convex to planar, midslopes of lateral moraines; ash mantle less than 14 inches thick; has a densic contact; has 45 to 55 dry days in summer
Tyeecreek (T)-occurs on planar to concave mid to lower slopes of glacial moraines and glacial valley floors; has argillic horizon; depth is greater than 60 inches
DRAINAGE AND PERMEABILITY:
Drainage: well drained
Permeability: moderately rapid
USE AND VEGETATION:
Use: watershed, wildlife habitat, timber production, livestock grazing and recreation
Native vegetation: subalpine fir, Engleman spruce, lodgepole pine, grouse whortleberry, red mountain heath, linanthus, lupines, heartleaf arnica, green false hellebore, Sitka valerian, Ross sedge and elk sedge
Ecological site: ABLA/VASC/POPU3; others may include PICO (ABLA)/VASC/POPU3 or ABLA/VAME
DISTRIBUTION AND EXTENT:
MLRA- E43
Distribution- Blue Mountains of northeastern Oregon
Extent- limited extent
MLRA OFFICE RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Union County, Oregon 2003. The name is from a lake near Anthony Lakes.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
ochric epipedon: 0.5 to 4 inches A
cambic horizon: upper 4 to 11 inches Bw
lower 22 to 29 inches 2Bw
andic soil properties: 0.5 to 22 inches A, Bw, BC
particle-size control section: 0.5 to 39 inches A, Bw, BC, 2Bw, 2BC
ashy part: 0.5 to 22 inches A, Bw, BC
loamy-skeletal part: 22 to 39 inches 2Bw, 2BC
lithic contact: 39 inches 2R