LOCATION JACKALOPE ORTentative Series
TAXONOMIC CLASS: Ashy over loamy-skeletal, glassy over isotic, frigid Alfic Udivitrands
TYPICAL PEDON: Jackalope ashy sandy loam - woodland, on a 32 percent north-facing slope at elevation of 4,500 feet. (Colors are for moist soil unless otherwise noted. Soil textures are apparent field textures.)
Oe--0 to 1 inches; decomposed forest litter
A--1 to 4 inches; dark brown (7.5YR 3/3) ashy sandy loam, brown (10YR 5/3) dry; weak very fine subangular blocky structure; soft, very friable, nonsticky, nonplastic and weakly smeary; many very fine roots throughout; common very fine irregular pores; 1 percent gravel; neutral (pH 7.2); clear wavy boundary. (3 to 6 inches thick)
Bw--4 to 17 inches; brown (7.5YR 4/3) ashy sandy loam, brown (10YR 5/3) dry; weak medium subangular blocky structure parting to weak fine and very fine subangular blocky; soft, very friable, nonsticky, nonplastic and weakly smeary; common very fine and few medium and fine roots throughout; common very fine irregular pores; 1 percent gravel; neutral (pH 7.0); abrupt wavy boundary. (13 to 26 inches thick)
2Eb--17 to 29 inches; brown (7.5YR 4/3) very gravelly loam, brown (10YR 5/3) dry; moderate medium and fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine roots throughout; common very fine and fine irregular pores; 25 percent gravel, and 10 percent cobbles; slightly acid (pH 6.5); clear wavy boundary. (8 to 13 inches thick)
2Btb1--29 to 43 inches; brown (7.5YR 4/3) very cobbly sandy clay loam, yellowish brown (10YR 5/4) dry; moderate medium subangular blocky structure parting to moderate fine subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; few thin clay films on ped faces; common medium and fine and few very fine roots throughout; common very fine irregular and few very fine tubular pores; 25 percent gravel, and 15 percent cobbles; slightly acid (pH 6.1); clear wavy boundary. (10 to 21 inches thick)
2Btb2--43 to 45 inches; brown (7.5YR 4/3) very cobbly sandy clay loam, yellowish brown (10YR 5/4) dry; moderate medium and fine subangular blocky structure; hard, friable, moderately sticky and moderately plastic; common thin clay films on ped faces; few very fine and fine roots throughout; few very fine and fine irregular pores; 35 percent gravel, and 25 percent cobbles; slightly acid (pH 6.1); abrupt wavy boundary. (2 to 9 inches thick)
2R--45 inches; andesite bedrock
TYPE LOCATION: Crook County, Oregon; northeast corner of Section 17 (NE1/4, NE1/4, NE1/4), T. 12 S., R. 17 E.
UTM Zone 10; 4,933,230 northing; 682,490 easting
Latitude: 44 degrees, 31 minutes, 45 seconds N.
Longitude: 120 degrees, 42 minutes, 12 seconds W
USGS Quadrangle: Dutchman Creek
RANGE IN CHARACTERISTICS:
Soil Temperature: frigid regime
Mean Annual Soil Temperature: 41 to 46 degrees F
Mean Summer Soil Temperature: 49 to 56 degrees F
Mean Winter Soil Temperature: 34 to 37 degrees F
Soil Moisture: udic regime, dry 30 to 45 days in summer
Particle-size control section: mineral surface to the 40 inches below the mineral surface
Upper part (ashy): 16 to 30 inches thick
Clay content: 1 to 6 percent
Silt content: 25 to 45 percent
Rock fragment content: 0 to 15 percent
Lower part (loamy-skeletal): 10 to 24 inches thick
Clay content: 18 to 35 percent
Rock fragment content: 35 to 60 percent
Diagnostic Horizons and Features:
andic soil material: upper boundary at the mineral soil surface; 16 to 30 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 tension (air dried): 5 to 12 percent
8Si + 2Fe (aox): 3 to 5 percent
8Si - 2Fe (aox): -1 to 0 percent
ochric epipedon: 3 to 6 inches thick
cambic horizon: 13 to 26 inches thick
argillic horizon: 16 to 30 inches thick
lithic contact depth: 40 to 60 inches
Major Horizons:
A horizon
color, moist: 5YR 2.5/2; 7.5YR 2.5/3, 3/3, 3/4, 4/3;
color, dry: 7.5YR 5/2, 5/3, 5/4; 10YR 5/3
texture: ASHY-SL
clay content: 1 to 6 percent
rock fragment content: 0 to 10 percent
gravel: 0 to 5 percent
cobbles: 0 to 5 percent
reaction: slightly acid or neutral; pH: 6.1 to 7.3
organic carbon: 1.0 to 5.0 percent
Bw horizons:
color, moist: 7.5YR 4/2, 4/3, 4/4
color, dry: 7.5YR 5/3, 5/4, 6/3; 10YR 5/3, 6/3, 6/4
texture: ASHY-SL
clay content: 2 to 6 percent
rock fragment content: 0 to 10 percent
gravel: 0 to 5 percent
cobbles: 0 to 5 percent
reaction: slightly acid or neutral; pH: 6.1 to 7.3
organic carbon: 0.6 to 1.0 percent
2Eb horizon: (2AEb in some pedons)
color, moist: 7.5YR 3/2, 3/4, 4/3
color, dry: 7.5YR 5/3, 6/3, 6/4; 10YR 5/3, 6/3, 6/4
texture: GR-L, GRV-L, GRV-SL
clay content: 10 to 19 percent
rock fragment content: 35 to 50 percent
gravel: 25 to 45 percent
cobbles: 5 to 15 percent
stones: 0 to 5 percent
reaction: slightly acid or neutral; pH: 6.1 to 7.3.
2Btb horizons: (2BC in some pedons)
color, moist: 7.5YR 4/3, 4/4; 10YR 4/3
color, dry: 7.5YR 4/4, 5/4, 6/3; 10YR 5/4
texture: GRV-SCL, GRV-SL, GRV-L, CBV-SCL, CBV-CL
clay content: 18 to 35 percent
rock fragment content: 40 to 60 percent
gravel: 20 to 45 percent
cobbles: 10 to 25 percent
stones: 0 to 5 percent
reaction: slightly acid or neutral; pH: 6.1 to 7.3
COMPETING SERIES:
Jackalope (T)--deep (40 to 60 inches) to a lithic contact; volcanic ash is ashy sandy loam (less than 50 percent silt) and has 60 to 90 percent glass; rock fragments in loamy-skeletal part of the pscs are subangular or angular; 2Bt is sandy loam, sandy clay loam, loam or clay loam with 18 to 35 percent clay; soil formed in volcanic ash over colluvium from andesite
Highfalls--very deep (>60 inches); volcanic ash is ashy silt loam and has 30 to 65 percent glass; rock fragments in the loamy-skeletal part of the pscs are rounded or well rounded; 2Bt is sandy loam or fine sandy loam with less than 18 percent clay; soil formed in volcanic ash over till from granite, gneiss and schist
GEOGRAPHIC SETTING:
Landform: planar to concave, depositional, mountain backslopes, of water dissected hard pyroclastic flows
Slope gradient: 5 to 50 percent
Parent material origin: volcanic ash over colluvium
Lithology: Clarno formation andesite
Elevation: 3,700 to 5,500 feet
Climate: cold, wet winters; warm, dry summers
Mean annual precipitation: 19 to 27 inches
Mean annual air temperature: 39 to 44 degrees F.
Frost-free period: 40 to 100 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Ingrampoint (T)--occurs on planar to convex mid slopes with a mixture of hard and soft tuffs and have a moist grand fir forest
Geisercreek (T)--occurs on concave to planar, mid to lower slopes with colluvium dominated by soft tuff substratum, ashy over clayey family, and have a moist grand fir forest
Larabee (T)--occurs on convex to planar mid to upper slopes and summits with colluvium dominated by andesites, loamy-skeletal family, and have a dry grand fir forest
Norlo (T)--occurs on mountain side slopes and benches with southerly aspects or on lower elevation north aspects and a dry grand fir or
Douglas fir forest
Terraverde (T)--occurs on planar to concave backslopes with a mixture of andesites and soft tuff colluvium and a moist grand fir forest
Whistler (T)--occurs on planar to convex backslopes, benches and summits with andesites dominating the bedrock and a moist grand fir forest
DRAINAGE AND PERMEABILITY:
Drainage: moderately well to well drained
Permeability: moderate over moderately slow
USE AND VEGETATION:
Use: Timber production, livestock grazing, recreation, wildlife, watershed
Native vegetation: grand fir, Douglas fir, ponderosa pine, longtube twinflower, grouse whortleberry, big huckleberry, common snowberry, side-flowered mitrewort, sidebells pyrola, showy aster, heartleaf arnica, pinegrass, Columbian brome, and elk sedge.
Ecological site: grand fir/longtube twinflower; ABGR/LIBOL2
DISTRIBUTION AND EXTENT:
MLRA--E43
Distribution: Ochoco Mountains.
Extent: Moderate
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Crook County, Oregon 2003. The name was from a spring on the Stephenson Mountain quadrangle map called Jackalope Spring.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
ochric horizon: 1 to 4 inches A
cambic horizon: 4 to 17 inches Bw
argillic horizon : 29 to 45 inches 2Btb1, 2Btb2
particle-size control section
ashy part - 1 to 17 inches A, Bw
loamy-skeletal part -17 to 41 inches 2Eb, 2Btb1