LOCATION HALLET ORTentative Series
TAXONOMIC CLASS: Ashy, glassy Vitrandic Haplocryolls
TYPICAL PEDON: Hallet ashy loam - herbaceous community, rangeland, on a 0 percent slope at 4610 feet elevation. (Colors are for dry soil unless otherwise noted.)
Oi--0 to 0.5 inch; slightly decomposed plant material; herbaceous litter dominated by grassy material; abrupt smooth boundary. (0 to 1 inch thick)
Oe--0.5 to 1 inch; moderately decomposed plant material; herbaceous litter dominated by grassy material; abrupt smooth boundary. (0 to 1 inch thick)
A1--1 to 9 inches; very dark grayish brown (10YR 3/2) ashy loam, black (10YR 2/1) moist; weak very fine granular structure; soft, very friable, slightly sticky, slightly plastic; many very fine, common fine and few medium roots; many very fine common fine, and few medium interstitial pores; 10 percent moderately cemented pumice paragravel; moderately acid (pH 5.8); clear wavy boundary.
A2--9 to 22 inches; dark gray (2.5Y 4/1) ashy loam, black (2.5Y 2.5/1) moist; moderate medium subangular blocky structure parting to moderate fine granular; slightly hard, very friable, moderately sticky, moderately plastic; many very fine, and few fine and medium roots; many very fine and few fine irregular pores; 10 percent moderately cemented pumice paragravel; moderately acid (pH 5.8); clear wavy boundary. (combined thickness of A horizons is 14 to 23 inches)
2B/A--22 to 35 inches; 60 percent B material consisting of light brownish gray (10YR 6/2) paragravelly ashy loamy coarse sand, dark grayish brown (10YR 4/2) moist; moderate medium subangular blocky structure parting to moderate medium granular; slightly hard, very friable, nonsticky, nonplastic; many very fine, few fine and medium roots; many very fine and few fine irregular pores; 25 percent moderately cemented pumice paragravel; moderately acid (pH 5.8); 40 percent A material consisting of krotovinas up to 4 inches diameter; clear irregular boundary. (6 to 24 inches thick)
2Bw1--35 to 63 inches; white (10YR 8/1) very paragravelly ashy coarse sand, light brownish gray (2.5Y 6/2) moist; single grain; loose, nonsticky, nonplastic; few very fine and fine roots; many very fine and fine, and few medium interstitial pores; 15 percent coarse irregular reddish yellow (7.5YR 6/8) iron-manganese masses in matrix, strong brown (7.5YR 5/6) moist; 40 percent moderately cemented pumice paragravel; moderately acid (pH 6.0); gradual smooth boundary. (6 to 30 inches thick)
2Bw2--63 to 80 inches; very pale brown (10YR 7/3) extremely paragravelly ashy coarse sand, light brown (7.5YR 6/4) moist; massive; soft, very friable, nonsticky, nonplastic; few fine and very fine roots; many very fine and fine, and few medium interstitial pores; 40 percent coarse irregular reddish yellow (7.5YR 6/8) iron-manganese masses in matrix, strong brown (7.5YR 5/6) moist; 70 percent moderately cemented pumice paragravel; moderately acid (pH 5.8).
TYPE LOCATION: Klamath County, Oregon; about 14 miles east and 6 miles north of Chiloquin; 1550 feet west and 2100 feet south of the northeast corner of section 35, T. 33 S., R. 9 E., Calimus Butte, Oregon USGS quadrangle. UTM: 614078 meters E; 4724867 meters N; Zone 10 N. NAD27 CONUS datum. Latitude: 42 degrees 40 minutes 11.00 seconds north, Longitude: 121 degrees 36 minutes 28.00 seconds west.
RANGE IN CHARACTERISTICS:
Soil Temperature: cryic regime
Mean annual soil temperature - 35 to 39 degrees F
Mean summer soil temperature - 39 to 43 degrees
Mean winter soil temperature - 32 to 35 degrees F
Soil Moisture: xeric regime. Moisture control section - 4 to 12 inches, saturated in lower part (A2 horizon) for 15 to 30 days in April or May, dry in all parts for 60 to 90 consecutive days in August, September or October
Particle-size control section: from 10 to 40 inches below the mineral soil surface
Upper part: 16 to 26 inches thick
Clay content, average: 10 to 20 percent
Rock fragment content, average: 0 to 10 percent
Pararock fragment (pumice) content, average: 0 to 20 percent
Lower part: 4 to 14 inches thick
Clay content, average: 2 to 5 percent
Rock fragment content, average: 0 percent
Pararock fragment (pumice) content, average: 35 to 70 percent
Diagnostic horizons and features:
vitrandic subgroup properties: from mineral soil surface to 60 inches or more
ammonium oxalate extractable Al plus 1/2 Fe: 0.2 to 0.4 percent
coarse silt and sand content: 40 to 80 percent of fine earth fraction
volcanic glass content: 30 to 90 percent
mollic epipedon: 14 to 23 inches
aquic conditions, depth below mineral soil surface: 20 to 40 inches
common or many iron-manganese concentrations, depth below mineral soil surface: 20 to 40 inches
A horizons
Hue: 10YR or 2.5Y moist or dry
Value: 2 or 3 moist, 3 or 4 dry
Chroma: 1 or 2 moist or dry
Texture: ashy loam, ashy silt loam, ashy clay loam
Coarse silt and sand content: 30 to 55 percent in the less than 2 mm fraction
Pumice paragravel content: 0 to 10 percent
Reaction: moderately to slightly acid (pH 5.6 to 6.5)
2B/A horizon
Depth to: 14 to 23 inches
Hue: 10YR or 2.5Y moist or dry
Value: 3 to 5 moist, 4 to 6 dry
Chroma: 2 or 3 dry
Texture: ashy coarse sand, ashy loamy coarse sand, paragravelly ashy coarse sand, paragravelly ashy loamy coarse sand
Clay content: 3 to 8 percent
Pumice paragravel content: 0 to 35 percent
Reaction: moderately acid (pH 5.6 to 6.0)
2Bw1 horizon
Depth to: 26 to 36 inches
Hue: 10YR or 2.5Y moist or dry
Value: 5 to 7 moist, 7 or 8 dry
Chroma: 1 or 2 moist or dry
Texture: very paragravelly ashy coarse sand, extremely paragravelly ashy coarse sand
Clay content: 2 to 5 percent
Pumice paragravel content: 35 to 70 percent
Reaction: moderately to slightly acid (pH 5.6 to 6.5)
2Bw2 horizon
Depth to: 40 to 70 inches
Hue: 7.5YR or 10YR moist, 10YR or 2.5Y dry
Value: 4 to 6 moist, 5 to 7 dry
Chroma: 2 to 6 moist or dry
Texture: very paragravelly ashy coarse sand, extremely paragravelly ashy coarse sand
Clay content: 2 to 5 percent
Pumice paragravel content: 35 to 70 percent
Reaction: moderately to slightly acid (pH 5.6 to 6.5)
COMPETING SERIES:
Anniecreek (OR) - have an irregular decrease in organic matter content with depth and have a udic moisture regime
Bigbutte (MT) - are 20 to 40 inches deep to bedrock
Bodiecreek (tentative CA) - have an irregular decrease in organic matter content with depth and are 40 to 60 inches deep to aquic conditions
Brownsbowl (NV CA) - have a mollic epipedon 40 to 45 inches thick, have a cambic horizon, and lack aquic conditions
Cadero (tentative ID) - are 20 to 40 inches deep to bedrock
GEOGRAPHIC SETTING:
Landscape - lava plateau and valleys
Landform - alluvial fans and drainageways
Elevation - 4200 to 5120 feet
Slope - 0 to 2 percent
Parent material - alluvium over alluvium derived from pumice
Climate - cold moist winters and cool dry summers
Mean annual air temperature - 42 to 45 degrees F
Mean annual precipitation - 18 to 24 inches
Frost-free period - 30 to 50 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Lapine and
Shukash soils. Lapine soils are excessively drained, and have andic soil properties throughout the particle-size control section.
Shukash soils are somewhat excessively drained, have andic soil properties in the upper part of the particle-size control section and have greater than 35 percent rock fragments in the lower part of the particle-size control section.
DRAINAGE AND PERMEABILITY:
Drainage - somewhat poorly
Permeability - moderate
Watertable - a seasonal water table with endosaturation is at its uppermost limit (A2 horizon) in April or May
USE AND VEGETATION: Hallet soils are used for livestock grazing, wildlife habitat, watershed and recreation. The potential natural plant community is the dry meadow series. Common species include Baltic rush, Cusick's bluegrass, mat muhly, prairie Junegrass, bighead horkelia, slender phlox and Western yarrow.
DISTRIBUTION AND EXTENT: Klamath County, Oregon; MLRA 6. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Winema National Forest, Klamath County, Oregon, 2008
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - 1 to 22 inches (A1 and A2 horizons) and having a regular decrease in organic carbon with depth
Vitrandic subgroup properties - 1 to 80 inches (A1, A2, 2B/A, 2Bw1, 2Bw2 horizons)
Aquic conditions with endosaturation - 35 to 80 inches (2Bw1 and 2Bw2 horizons)
Particle-size control section - 11 to 41 inches (A2, 2B/A and 2Bw1 horizons); 1 to 35 inches is ashy (over 30 percent glass in all parts) and 35 to 41 inches is ashy-pumiceous. The thickest part is ashy.
A2 and 2B/A horizons lack criteria for aquic conditions.
ADDITIONAL DATA:
NASIS SITE ID - 04-JFD-03; NASIS PEDON ID - 04OR683003
Volcanic glass content in the mollic epipedon is based on NSSL analysis on similar materials in the Dilman (sample number S03OR-035-011, sampled as Chocknott) and Mighty (sample number S02OR-O35-007) soils.