LOCATION HONDU ORTentative Series
TAXONOMIC CLASS: Loamy-skeletal, isotic, frigid Andic Haploxerepts
TYPICAL PEDON: Hondu ashy sandy loam - forested, on a 40 percent convex northwest-facing slope at an elevation of 6,300 feet. (Colors are for moist soil unless otherwise noted.)
Oi--0 to 0.5 inches; slightly decomposed needles and twigs
A--0.5 to 2 inches; very dark grayish brown (10YR 3/2) ashy sandy loam, brown (10YR 5/3) dry; weak fine granular structure; soft very friable, nonsticky and nonplastic; many very fine and fine roots; few fine irregular pores; 10 percent gravel; neutral (pH 7.0); clear smooth boundary. (1 to 6 inches thick)
Bw--2 to 9 inches; brown (10YR 4/3) gravelly ashy sandy loam, pale brown (10YR 6/3) dry; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and fine and common medium roots; few fine irregular pores; 15 percent gravel; neutral (pH 7.0); clear wavy boundary. (7 to 12 inches thick)
2Eb--9 to 17 inches; yellowish brown (10YR 5/4) very gravelly sandy loam, light yellowish brown (10YR 6/4) dry; weak very fine subangular blocky structure; soft, very friable, slightly sticky and nonplastic; many medium and common fine and coarse roots; few fine irregular and tubular pores; 35 percent gravel and 5 percent cobbles; neutral (pH 7.0); clear wavy boundary. (5 to 16 inches thick)
2EBb--17 to 24 inches; yellowish brown (10YR 5/6) very gravelly sandy loam, brownish yellow (10YR 6/6) dry; weak very fine subangular blocky structure; soft, very friable, slightly sticky and nonplastic; common fine and medium and few coarse roots; common fine irregular and few fine tubular pores; 45 percent gravel and 5 percent cobbles; neutral (pH 7.0); gradual smooth boundary. (0 to 7 inches thick)
2Bwb--24 to 50 inches; yellowish brown (10YR 5/6) very gravelly sandy loam, brownish yellow (10YR 6/6) dry; weak fine and medium subangular blocky structure; soft, friable, nonsticky and nonplastic; few fine and medium and coarse roots; few fine irregular and tubular pores; 50 percent gravel and 5 percent cobbles; neutral (pH 7.0); gradual smooth boundary. (9 to 27 inches thick)
2BCb--50 to 61 inches; yellowish brown (10YR 5/6) extremely gravelly sandy loam, brownish yellow (10YR 6/6) dry; weak very fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; few fine and medium and coarse roots; many fine and few medium irregular pores; 70 percent gravel and 10 percent cobbles; neutral (pH 7.0). (9 to 19 inches thick)
TYPE LOCATION: Baker County, Oregon
Section 01 (SE 1/4, SE 1/4, NE 1/4), T. 15 S., R. 36 E.
Latitude: 44 degrees, 17 minutes, 40 seconds N
Longitude: 118 degrees, 13 minutes, 54 seconds W
UTM coordinates: zone 11; northing: 4,905,098; easting: 401,738; NAD27
USGS Quadrangle: Rastus Mountain
RANGE IN CHARACTERISTICS:
Soil Temperature: frigid regime
Mean Annual Soil Temperature: 39 to 45 degrees F
Mean Summer Soil Temperature: 46 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: 3 to 9 percent
rock fragment content, average: 50 to 70 percent
Diagnostic Horizons and Features:
andic soil properties: upper boundary at the mineral surface; 7 to 13 inches thick
Al+1/2Fe (ammonium oxalate): 1.0 to 2.4 pct
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 0.02-20 mm fraction: 50 to 80 percent
water content at 1500 kPa (air dried): 5 to 12 percent
cambic horizon, upper: 7 to 12 inches thick
cambic horizon, buried: 9 to 27 inches thick
A horizon:
color, moist: 10YR 3/2, 3/3
color, dry: 10YR 4/2, 5/3
texture: GR-ASHY-SIL, GR-ASHY-L, GR-ASHY-SL, ASHY-SL
clay content: 6 to 10 percent
rock fragment content: 10 to 35 percent
gravel: 10 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: 10YR 3/4, 4/3, 4/4, 5/4
color, dry: 10YR 5/4, 6/3, 6/4
texture: GR-ASHY-FSL, GR-ASHY-SIL, GR-ASHY-SL, GR-ASHY-L
clay content: 5 to 8 percent
rock fragment content: 15 to 35 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
2Eb horizon:
color, moist: 10YR 3/4, 4/3, 5/4
color, dry: 10YR 6/3, 6/4
texture GRV-SL, GRX-SL, GRV-SIL
clay content: 5 to 10 percent
rock fragment content: 50 to 70 percent
gravel: 35 to 65 percent
cobbles: 0 to 5 percent
stones: 0 to 5 percent
reaction: slightly acid to neutral; pH: 6.1 to 7.3
2Bwb horizon:
color, moist: 10YR 4/4, 4/6, 5/4, 5/6
color, dry: 10YR 6/3, 6/6, 7/4
texture: GRX-SL, GRV-SL
clay content: 3 to 8 percent
rock fragment content: 45 to 70 percent
gravel: 45 to 65 percent
cobbles: 0 to 10 percent
stones: 0 to 5 percent
reaction: slightly acid to neutral; pH: 6.1 to 7.3
2BCb horizon:
color, moist: 10YR 4/4, 5/6, 6/6; 2.5Y 5/4
color, dry: 10YR 6/3, 6/6, 7/4; 2.5Y 5/2, 7/4
texture: GRX-SL
clay content: 3 to 11 percent
rock fragment content: 60 to 80 percent
gravel: 50 to 70 percent
cobbles: 0 to 10 percent
stones: 0 to 5 percent
reaction: slightly acid to neutral; pH: 6.1 to 7.3
COMPETING SERIES:
Avonville - formed in glacial outwash; umbric epipedon
Bigcow - deep and very deep (40 to 80 inches to a lithic contact); formed in basalt colluvium with thin mantle of volcanic ash; clay content in particle-size control section averages 9 to 16 percent
Inkler - dry for 60 to 75 consecutive days in summer
Juandefuca - ash mantle has greater than 12 percent (air dried) water content at 1500 kPa (i.e. medial) and volcanic glass content less than 30 percent
McCree - deep (40 to 60 inches) to a lithic contact (rhyolite); ash mantle has 5 to 20 percent volcanic glass content; dry 60 to 75 consecutive days in summer
Newhorn - moderately deep (20 to 40 inches) to a densic contact (till); dry 60 to 75 consecutive days in summer
Oxerine - moderately deep (20 to 40 inches) to a lithic contact (gneiss); dry 60 to 75 consecutive days in summer
Piutespring - moderately deep (20 to 40 inches) to a lithic contact (granitic rock)
Redriver - moderately deep (20 to 40 inches) to a lithic contact (basalt); dry 75 to 90 consecutive days in summer
Tunnelcreek - moderately deep (20 to 40 inches) to a paralithic contact over metavolcanic bedrock; ochric epipedon; ash mantle has greater than 12 percent (air dried) water content at 1500 kPa (i.e. medial); clay content in particle-size control section averages 8 to 18 percent
Veridge - moderately deep (20 to 40 inches) to a lithic contact (sandstone); thin volcanic ash mantle has 30 to 60 percent volcanic glass content; less than 10 percent clay in particle-size control section; dry 60 to 75 consecutive days in summer
Wilma - moderately deep (20 to 40 inches) to a lithic contact (granite); 2C or 2BC horizons with hue of 10YR or 2.5Y; dry 60 to 75 consecutive days in summer
Wonder - moderately deep (20 to 40 inches) to a lithic contact (andesitic basalt); clay content in particle-size control section averages 9 to 15 percent; rock fragments are subangular or angular
GEOGRAPHIC SETTING:
Landform: backslopes of mountains
Slope gradient: 30 to 60 percent
Parent material: volcanic ash overlying colluvium and residuum
Lithology: argillite or metavolcanic rocks
Elevation: 4,000 to 6,000 feet
Climate: cold, wet winters and cool, dry summers
Mean annual precipitation: 15 to 30 inches
Mean annual air temperature: 37 to 43 degrees F
Frost-free period: 30 to 80 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Analulu: on convex backslopes and ridges, moderately deep to bedrock with a minor influence of volcanic ash under Douglas-fir, ponderosa pine or grand fir forest
Blackgulch: on moderately dissected backslopes, shallow to bedrock with a mollic epipedon, minor influence of volcanic ash under ponderosa pine, Douglas-fir, elk sedge or common snowberry
Deck: on plateau crests and backslopes; moderately deep to lithic contact; mollic epipedon with a mixed mantle of volcanic ash and loamy-skeletal cambic; under Douglas-fir, ponderosa pine, common snowberry, mallow ninebark, pinegrass and elk sedge
Eastpine: on ridges, shoulders and backslopes; moderately deep to metasedimentary rock; mollic epipedon with small amount of volcanic ash and loamy-skeletal cambic horizon; under grand fir, Douglas-fir, western larch, Rocky Mountain maple, birchleaf spiraea and pinegrass
McWillar: on backslopes; deep to argillite bedrock; thick volcanic ash mantle over loamy-skeletal argillic horizon; under grand fir, birchleaf spirea, pussytoes and pinegrass
Payraise: on backslopes; in very deep colluvium with thin volcanic ash mantle and loamy-skeletal argillic horizon under grand fir, pinegrass and birchleaf spiraea
Vogel: on convex shoulders and backslopes; shallow to argillite bedrock with small amount of volcanic ash mixed in loamy-skeletal colluvium; under open ponderosa pine and Douglas-fir forest
DRAINAGE AND PERMEABILITY:
Drainage: well
Permeability: moderately rapid
USE AND VEGETATION:
Use: timber production, watershed, wildlife habitat, livestock production and recreation
Native vegetation: grand fir, Douglas-fir, ponderosa pine, western larch, lodgepole pine, prince's pine, bearberry, birchleaf spiraea, curlleaf mountain mahogany, white flowered hawkweed, heartleaf arnica, showy aster, sweet cicely, lupine, pinegrass, elk sedge and northwestern sedge
Ecological site: ABGR/CARU (grand fir/pinegrass); may include PSME/CARU (Douglas-fir/pinegrass) and PSME/CELE/CAGE (Douglas-fir/ curlleaf mountain mahogany/elk sedge)
DISTRIBUTION AND EXTENT:
Distribution: MLRA 43c; Blue Mountains, eastern Oregon
Extent: small
MLRA OFFICE RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Wallowa-Whitman National Forest, Oregon 2008. Name is from a spring on Rastus Mountain quadrangle.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
ochric epipedon: 0.5 to 2 inches; A horizon
cambic horizon, upper: 2 to 9 inches; Bw horizon
eluvial layer, buried: 9 to 24 inches; 2Eb, 2EBb horizons
cambic horizon, buried: 24 to 50 inches: 2Bwb horizon
andic subgroup properties: 0.5 to 9 inches; A, Bw horizons
particle-size control section: 10 to 40 inches; 2Eb, 2EBb, 2Bwb horizons
ADDITIONAL DATA: NSSL pedon ID: 92OR063007, 97OR059002