LOCATION TERTOO ORTentative Series
TAXONOMIC CLASS: Ashy over loamy-skeletal, amorphic over isotic, frigid Typic Vitrixerands
TYPICAL PEDON: Tertoo cobbly ashy silt loam - woodland, on a 1 percent slope at an elevation of 3,640 feet. (Colors are for moist soil unless otherwise noted. Soil textures are apparent field textures.)
Oi-- 0 to 1 inches; needles and twigs
A--1 to 8 inches; dark brown (7.5YR 3/3) cobbly ashy silt loam, brown (7.5YR 5/3) dry; weak very fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; weakly smeary; many very fine and fine, common medium and few coarse roots; few very fine irregular pores; 5 percent gravel, 15 percent cobble, and 5 percent stones; slightly acid (pH 6.3); gradual smooth boundary. (2 to 7 inches thick)
Bw--8 to 18 inches; brown (7.5YR 4/3) cobbly ashy silt loam, light brown (7.5YR 6/3) dry; weak fine and very fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; weakly smeary; common very fine, fine, medium, and coarse, and few very coarse roots; few very fine irregular pores; 10 percent gravel, 15 percent cobbles, and 8 percent stones; slightly acid (pH 6.3); clear wavy boundary. (9 to 15 inches thick)
2Bwb--18 to 32 inches; brown (7.5YR 4/3) extremely cobbly sandy loam, brown (7.5YR 5/3) dry; moderate medium and fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine, fine and medium, and few coarse roots; common very fine irregular pores; 25 percent gravel, 30 percent cobbles, and 15 percent stones; slightly acid (pH 6.5); gradual smooth boundary. (7 to 20 inches thick)
2C--32 to 61 inches; dark brown (7.5YR 3/3) extremely cobbly sandy clay loam, brown (7.5YR 5/3) dry; massive; soft, friable, slightly sticky and slightly plastic; common very fine and fine, and few medium roots; many very fine irregular pores; 35 percent gravel, 35 percent cobbles, and 15 percent stones; neutral (pH 6.7).
TYPE LOCATION: Union County, Oregon
Section 4 (SW , NW , SW ), T. 3 S., R. 36 E.
Latitude: 45 degrees, 19 minutes, 46 seconds North
Longitude: 118 degrees, 19 minutes, 17 seconds West
UTM Coordinates: Zone: 11; Northing: 5,020,410; Easting: 396,440
USGS Quadrangle: Kamela SE
RANGE IN CHARACTERISTICS:
Soil Temperature: frigid regime
Mean Annual Soil Temperature: 43 to 46 degrees F
Mean Summer Soil Temperature: 51 to 57 degrees F
Mean Winter Soil Temperature: 34 to 38 degrees F
Soil Moisture: xeric regime, dry 45 to 60 days in summer
Particle-size control section: mineral surface to 40 inches below the mineral surface
Upper part (ashy): 14 to 22 inches thick
Clay content (wt. avg.): 2 to 8 percent
Rock fragment content (wt. avg.): 0 to 30 percent
Lower part (loamy-skeletal): 8 to 23 inches thick
Clay content (wt. avg.): 3 to 13 percent
Rock fragment content (wt. avg.): 40 to 75 percent
Rock fragment shape: rounded
Diagnostic Horizons and Features:
andic soil material: upper boundary at the mineral soil surface; 14 to 22 inches thick
Al+1/2Fe (aox): 1.0 to 2.5 percent
bulk density: 0.65 to 1.00 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 0.02-2.0mm fraction: 60 to 90 percent
water content at 1500 kPa tension (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 horizon:
upper: 9 to 15 inches thick
lower: 7 to 20 inches thick
Major Horizons:
A horizon (AB in some pedons)
color, moist: 5YR 3/1; 7.5YR 3/2, 3/3; 10YR 3/2
color, dry: 7.5YR 4/3, 5/2, 5/3, 5/4; 10YR 5/2
texture: ASHY-SIL, CB-ASHY-SIL, ASHY-SL, GR-ASHY-SL
clay content: 3 to 8 percent
rock fragment content: 0 to 25 percent
gravel: 0 to 20 percent
cobbles: 0 to 15 percent
stones: 0 to 5 percent
reaction: slightly acid or neutral; 6.1 to 7.3 pH
organic carbon: 1 to 5 percent
Bw horizon (AC or BC in some pedons)
color, moist: 7.5YR 3/2, 3/3, 4/3; 10YR 4/3
[r1] color, dry: 7.5YR 4/3, 5/4, 6/3; 10YR 6/3, 7/4
texture: ASHY-SIL, CB-ASHY-SIL, GR-ASHY-SIL
clay content: 2 to 8 percent
rock fragment content: 0 to 34 percent
gravel: 0 to 20 percent
cobbles: 0 to 15 percent
stones: 0 to 8 percent
reaction: slightly acid or neutral; pH: 6.1 to 7.3
organic carbon: 0.6 to 1.0 percent
2Bwb horizon (2Eb, 2AEb in some pedons)
color, moist: 7.5YR 3/2, 3/3, 4/3, 5/4; 10YR 5/4
color, dry: 7.5YR 4/3, 5/3, 5/4; 10YR 6/3, 7/4
texture: BYX-SL, STX-SIL, STX-LS, GRX-SL, CBX-SL
clay content: 4 to 12 percent
rock fragment content: 40 to 80 percent
gravel: 25 to 45 percent
cobbles: 5 to 30 percent
stones : 5 to 15 percent
reaction: slightly acid or neutral; 6.1 to 7.3 pH
organic carbon: 0 to 1.2 percent
2C horizon
color, moist: 7.5YR 3/2, 3/3, 4/3, 5/4
color, dry: 7.5YR 5/3, 5/4, 6/3, 6/4
texture: STX-SL, CBX-SCL, STX-LS, CBX-LS
clay content: 3 to 22 percent
rock fragment content: 70 to 85 percent
gravel: 20 to 40 percent
cobbles: 10 to 35 percent
stones: 5 to 20 percent
boulders: 0 to 5 percent
reaction: neutral; 6.6 to 7.3 pH
organic carbon: 0 to 0.6 percent
COMPETING SERIES:
These are the Endcreek (T), Kingbolt (T),
Larrupin, Poguepoint (T), Raggedrock (T), and Twocolor (T) series. Soils with a similar classification include the
Brannan,
Capoose,
Crackler,
Elbowlake,
Faraway (T),
Kellerbutte,
Kootenai,
Natapoc,
Nevine,
Olot,
Rouen,
Saska, and
Vingulch (T) series.
Endcreek soils - moderately deep (20 to 40 inches) to a lithic contact (granite)
Kingbolt soils - moderately deep (20 to 40 inches) to lithic contact (argillite); loamy-skeletal part of the pscs has 35 to 75 percent angular and subangular rock fragments of metavolcanic, metasedimentary rock or rhyolite origin of which less than 15 percent are cobbles and stones
Larrupin soils - ashy part of pscs has 30 to 60 percent volcanic glass and have a texture of ashy loamy sand or ashy sandy loam; loamy-skeletal part of pscs has 35 to 60 percent rounded or subrounded gravel and cobbles of mixed origin from mudflow material
Poguepoint soils - deep (40 to 60 inches) to a lithic contact (andesitic basalt); loamy-skeletal part of the pscs has 40 to 70 percent subangular gravel, cobbles and stones of andesitic basalt origin; MAST is 39 to 41 degrees F.
Raggedrock soils - deep (40 to 60 inches) to a paralithic contact (granite); loamy-skeletal part of the pscs has 40 to 75 percent subrounded rock fragments of granite origin; MAST is 40 to 41 degrees F.
Twocolor soils - MAST is 39 to 42 degrees F.; the 2Bwb horizon has 12 to 22 percent clay
Brannan soils - deep (40 to 60 inches) to a lithic contact (schist); ashy part of pscs has 15 to 35 percent channers and flags and glassy mineralogy; loamy-skeletal part of the pscs has 15 to 30 percent clay and 35 to 60 percent channers and flags
Capoose soils - moderately deep (20 to 40 inches) to a lithic contact (granite); ashy part of pscs has 30 to 60 percent volcanic glass and glassy mineralogy; loamy-skeletal part of pscs has 40 to 70 percent angular rock fragments of granitic origin; dry 60 to 75 consecutive days following the summer solstice
Crackler soils - deep (40 to 60 inches) to a lithic contact (argillite); ashy part of pscs has 15 to 30 pecent gravel and cobbles and glassy mineralogy; loamy-skeletal part of the pscs has 18 to 35 percent clay and 40 to 75 percent subangular gravel and cobbles
Elbowlake soils - moderately deep (20 to 40 inches) to a densic contact; ashy part of pscs has 30 to 60 percent volcanic glass and glassy mineralogy; loamy-skeletal part of the pscs has 12 to 18 percent clay
Farway soils - ashy part of pscs has 30 to 60 percent volcanic glass, texture of ashy sandy loam, and glassy mineralogy; dry 60 to 75 days consecutive days following the summer solstice
Kellerbutte soils - ashy part of pscs has 30 to 60 percent volcanic glass, 5 to 25 percent angular rock fragments and glassy mineralogy; rock fragments in loamy-skeletal part of pscs are angular
Kootenai soils - ashy part of pscs has 30 to 60 percent volcanic glass, 0.4 to 1.0 percent Al + 1/2Fe(aox), and glassy mineralogy; loamy-skeletal part of pscs has coarse sand or loamy coarse sand textures
Natapoc soils - very deep (>60 inches) to a densic contact; ashy part of pscs 30 to 60 percent volcanic glass, ashy sandy loam texture, and glassy mineralogy; dry 60 to 75 consecutive days following the summer solstice
Nevine soils - deep (40 to 60 inches) to a densic contact; ashy part of pscs has 30 to 60 percent volcanic glass and glassy mineralogy; dry 60 to 75 consecutive days following the summer solstice
Olot soils - moderately deep (20 to 40 inches) to a lithic contact (basalt); ashy part of pscs has glassy mineralogy; loamy-skeletal part of the pscs has 25 to 35 percent clay and 35 to 75 percent angular and subangular rock fragments
Rouen soils - moderately deep (20 to 40 inches) to a lithic contact (argillite); ashy part of pscs has glassy mineralogy; loamy-skeletal part of the pscs has 25 to 35 percent clay and 35 to 70 percent angular and subangular gravel and cobbles
Saska soils - ashy part of pscs has 30 to 60 percent volcanic glass and glassy mineralogy with a texture of ashy loamy sand or ashy sandy loam mixed with pumice; Bs horizons 14 to 24 inches thick
Vingulch soils - moderately deep (20 to 40 inches) to a lithic contact (gneiss); ashy part of pscs has 30 to 60 percent volcanic glass, glassy mineralogy, and texture of ashy loamy very fine sand and ashy coarse sandy loam with 10 to 25 percent pumice; dry 60 to 75 consecutivd days following the summer solstice
GEOGRAPHIC SETTING:
Landform: high terraces on valley floors
Slope gradient: 0 to 10 percent
Parent material: volcaniclastic volcanic ash over alluvium
Lithology: Mazama ash over alluvium from mixed rocks
Elevation: 3,600 to 4,800 feet
Climate: cold, wet winters and warm, dry summers
Mean annual precipitation: 17 to 25 inches
Mean annual air temperature: 41 to 44 degrees F
Frost-free period: 40 to 120 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Riceton soils - occur on fan terraces on valley floors; no volcanic ash influence; mollic epipedon; less than 35 percent rock fragments in pscs.
DRAINAGE AND PERMEABILITY:
Drainage: well drained
Permeability: moderate to moderately rapid
USE AND VEGETATION:
Use: timber production, watershed, wildlife, recreation, livestock grazing
Native vegetation: grand fir, Douglas fir, ponderosa pine, common snowberry, birchleaf spiraea, Rocky Mountain maple, mountain big sagebrush, showy aster, Sierra peavine, northern bedstraw, pinegrass, elk sedge, Idaho fescue, blue wildrye and Kentucky bluegrass.
DISTRIBUTION AND EXTENT:
MLRA--E43c, Blue Mountains
Distribution: Blue Mountains of northeastern Oregon
Extent: small
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Union County, Oregon 2004. The name is coined.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
ochric epipedon: 1 to 8 inches; A horizon
cambic horizon:
upper: 8 to 18 inches; Bw horizon
lower: 18 to 32 inches; 2Bwb horizon
andic soil properties: 1 to 18 inches; A, Bw horizons
particle-size control section:
ashy part: 1 to 18 inches; A, Bw horizons
loamy-skeletal part: 18 to 41 inches; 2Bw, 2C horizons
USFS Ecological site: Dominant: ABGR/CARU; others may include: ABGR/CAGE, ABGR/ACGL, PIPO/SYAL and PIPO/ARTRV/FEID