LOCATION MIGHTY ORTentative Series
TAXONOMIC CLASS: pumiceous or ashy-pumiceous over loamy, glassy over isotic, nonacid Aquandic Cryaquepts
TYPICAL PEDON: Mighty ashy clay loam - lodgepole pine/rose spirea/widefruit sedge plant association, woodland, on a 1 percent slope at 4880 feet elevation. (Colors are for moist soil unless otherwise noted.)
Oi--0 to 1 inch; slightly decomposed plant material; forest litter of needles, twigs, cones, leaves and herbaceous material; abrupt smooth boundary. (0 to 2 inches thick)
Oe--1 to 2 inches; moderately decomposed plant material; forest litter of needles, twigs, cones, leaves and herbaceous material; abrupt smooth boundary. (0 to 2 inches thick)
Oa--2 to 4 inches; highly decomposed plant material; forest litter of needles, twigs, cones, leaves and herbaceous material; abrupt smooth boundary. (0 to 3 inches thick)
A--4 to 8 inches; black (2.5Y 2.5/1) ashy clay loam, gray (2.5Y 6/1) dry; massive; hard, friable, slightly sticky, moderately plastic; common very fine and medium, few fine and coarse roots; many fine irregular pores; 3 percent moderately cemented pumice paragravel; slightly acid (pH 6.4); abrupt smooth boundary. (2 to 12 inches thick)
AEg--8 to 11 inches; dark grayish brown (2.5Y 4/2) ashy clay loam, light gray (2.5Y 7/1) dry; massive; moderately hard, friable, slightly sticky, moderately plastic; common very fine, few fine and few medium roots; many fine irregular pores; 2 percent moderately cemented pumice paragravel; slightly acid (pH 6.4); clear wavy boundary. (0 to 12 inches thick)
2Eg1--11 to 30 inches; 50 percent gray (2.5Y 6/1) and 50 percent grayish brown (2.5Y 5/2) ashy coarse sand, 50 percent white (2.5Y 8/1) and 50 percent light gray (2.5Y 7/1) dry; massive; soft, very friable, nonsticky, nonplastic; few very fine roots; many very fine and common fine irregular pores; 5 percent moderately cemented pumice paragravel; slightly acid (pH 6.4); clear wavy boundary. (6 to 20 inches thick)
2Eg2--30 to 39 inches; light gray (2.5Y 7/1) very paragravelly ashy coarse sand, white (2.5Y 8/1) dry; massive; slightly hard, very friable, nonsticky, nonplastic; many very fine and common fine irregular pores; 35 percent moderately cemented pumice paragravel; slightly acid (pH 6.4); abrupt smooth boundary. (5 to 19 inches thick)
3Bw1--39 to 49 inches; 60 percent grayish brown (2.5Y 5/2) and 40 percent brown (10YR 4/3) loam, 60 percent gray (2.5Y 6/1) and 40 percent yellowish brown (10YR 5/4) dry; massive; hard, friable, slightly sticky, moderately plastic; many very fine irregular pores; 1 percent strongly cemented gravel size iron-manganese nodule; neutral (pH 6.6); clear smooth boundary. (4 to 20 inches thick)
3Bw2--49 to 64 inches; 60 percent brown (10YR 5/3) and 40 percent light olive brown (2.5Y 5/3) silty clay loam, 60 percent light yellowish brown (10YR 6/4) and 40 percent light brownish gray (2.5Y 6/2) dry; massive; very hard, firm, moderately sticky, very plastic; many very fine irregular pores; 10 percent indurated volcanic rock gravel and 1 percent strongly cemented gravel size iron-manganese nodule; neutral (pH 6.8).
TYPE LOCATION: Klamath County, Oregon; about 1 mile north and 26 miles east of Chiloquin; 1650 feet east and 550 feet south of the northwest corner of section 25, T. 34 S., R. 11 E., Spodue Mountain, Oregon USGS quadrangle. UTM: 634413 meters E; 4717534 meters N; Zone 10 N. NAD27 CONUS datum. Latitude: 42 degrees 36 minutes 2.00 seconds north, Longitude: 121 degrees 21 minutes 42.00 seconds west.
RANGE IN CHARACTERISTICS:
Soil Temperature: cryic regime
Mean annual soil temperature - 35 to 38 degrees F
Mean summer soil temperature - 37 to 40 degrees F
Mean winter soil temperature - 34 to 37 degrees F
Soil Moisture: aquic regime; moisture control section - 4 to 24 inches, saturated in all parts for 90 to 180 days in January through May
Particle-size control section: from 10 to 40 inches below the mineral soil surface
Upper part: ashy - 6 to 20 inches thick
Ammonium oxalate extractable Al plus 1/2 Fe: 0.2 to 0.4 percent
Coarse silt and sand content: 30 to 55 percent in the less than 2 mm fraction
Volcanic glass content: 30 to 90 percent
Pumice paragravel content, average: 0 to 10 percent
Middle part: ashy-pumiceous - 5 to 19 inches thick
Ammonium oxalate extractable Al plus 1/2 Fe: 0.0 to 0.2 percent
Volcanic glass content: 50 to 90 percent
Pumice paragravel content, average: 35 to 70 percent
Lower part: loamy - 1 to 10 inches thick
Volcanic glass content: 0 to 5 percent
Clay content, average: 20 to 30 percent
Paragravel content, average: 0 to 2 percent
Gravel content, average: 0 to 15 percent
Diagnostic horizons and features:
Aquandic subgroup properties: from the mineral soil surface to a depth of 30 to 39 inches
Ammonium oxalate extractable Al plus 1/2 Fe: 0.0 to 0.4 percent
Coarse silt and sand content: 30 to 50 percent in the less than 2 mm fraction
Volcanic glass content: 30 to 90 percent in the 0.02 to 2.0 mm fraction
Phosphate retention: 5 to 25 percent
Aquic conditions with endosaturation at the mineral soil surface
Albic materials with redoximorphic depletion: 2 to 12 inches below the mineral soil surface
A horizon
Hue: 10YR or 2.5Y moist or dry
Value: 2 to 4 moist, 6 or 7 dry
Chroma: 1 or 2 moist or dry
Clay content: 28 to 35 percent
Pumice paragravel content: 0 to 10 percent
Reaction: moderately acid or slightly acid (pH 5.6 to 6.5)
AEg horizon
Depth to: 2 to 12 inches
Hue: 10YR or 2.5Y moist or dry
Value: 3 to 6 moist, 6 to 8 dry
Chroma: 1 or 2 moist or dry
Texture: ashy loam, ashy silt loam, ashy clay loam
Clay content: 25 to 35 percent
Pumice paragravel content: 0 to 10 percent
Reaction: moderately to slightly acid (pH 5.6 to 6.5)
2Eg1 horizon
Depth to: 6 to 14 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: ashy coarse sand, paragravelly ashy coarse sand, ashy loamy coarse sand, paragravelly ashy loamy coarse sand
Clay content: 2 to 5 percent
Pumice paragravel content: 0 to 25 percent
Reaction: slightly acid or neutral (pH 6.1 to 7.3)
2Eg2 horizon
Depth to: 14 to 30 inches
Hue: 2.5Y moist or dry
Value: 5 to 7 moist, 7 to 8 dry
Chroma: 1 to 3 moist, 1 or 2 dry
Texture: very paragravelly ashy coarse sand, extremely paragravelly ashy coarse sand, very paragravelly ashy loamy coarse sand, extremely paragravelly ashy loamy coarse sand
Clay content: 2 to 5 percent
Pumice paragravel content: 35 to 70 percent
Reaction: slightly acid or neutral (pH 6.1 to 7.3)
3Bw1 horizon
Depth to: 30 to 40 inches
Hue: 7.5YR, 10YR or 2.5Y moist or dry
Value: 4 or 5 moist, 5 to 7 dry
Chroma: 1 to 4 moist or dry
Texture: loam, silt loam, clay loam
Clay content: 20 to 30 percent
Pumice paragravel content: 0 to 2 percent
Gravel content: 0 to 15 percent
Volcanic glass content: 0 to 5 percent
Reaction: slightly acid or neutral (pH 6.1 to 7.3)
3Bw2 horizon
Depth to: 40 to 60 inches
Hue: 7.5YR, 10YR or 2.5Y moist or dry
Value: 4 or 5 moist, 5 to 7 dry
Chroma: 2 or 3 moist, 2 to 4 dry
Texture: clay loam, silty clay loam, silty clay, clay
Clay content: 30 to 40 percent
Pumice paragravel content: 0 to 2 percent
Gravel content: 0 to 15 percent
Volcanic glass content: 0 to 5 percent
Reaction: slightly acid or neutral (pH 6.1 to 7.3)
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING:
Landscape - lava plateau
Landform - drainageways
Elevation - 4270 to 5200 feet
Slope - 0 to 1 percent
Parent material - alluvium derived from pumice over alluvium
Climate - cold moist winters and cool dry summers
Mean annual air temperature - 41 to 45 degrees F
Mean annual precipitation - 18 to 24 inches
Frost-free period - 5 to 35 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Bigtop,
Bottlespring and
Shukash soils.
Bigtop soils have greater than 35 percent clay throughout the particle-size control section and are 20 to 40 inches deep to a duripan.
Bottlespring soils are well drained, have greater than 35 percent clay throughout the particle-size control section and are 20 to 40 inches deep to a duripan.
Shukash soils are somewhat excessively drained, have andic soil properties in the upper portion of the particle-size control section and 10 to 20 percent clay in the lower portion of the particle-size control section.
DRAINAGE AND PERMEABILITY:
Drainage - poorly drained
Permeability - very slow
Watertable - a seasonal water table is at its uppermost limit in January through May
Ponding - occurs in some areas during March, April or May
USE AND VEGETATION: Mighty soils are used for wildlife habitat, watershed and recreation. The potential natural plant communities are the lodgepole pine/rose spirea/widefruit sedge plant association and the lodgepole pine/rose spirea/forb plant association.
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:
Ochric epipedon
Aquic conditions with endosaturation - 4 to 64 inches (A, AEg, 2Eg1, 2Eg2, 3Bw1 and 3Bw2 horzions).
Albic materials with redoximorphic depletion - 8 to 39 inches (AEg, 2Eg1 and 2 Eg2 horizons)
Cambic horizon: 39 to 64 inches (3Bw1 and 3Bw2 horizons)
Particle-size control section - 14 to 44 inches (2Eg1, Eg2 and 3Bw1 horizons); 14 to 30 inches is ashy (16 inches thick), 30 to 39 inches is ashy-pumiceuos (9 inches thick) and 39 to 44 inches is isotic (5 inches thick). Ashy over ashy-pumiceous is not strongly contrasting. Ashy-pumiceous over loamy is strongly contrasting. The ashy-pumiceous layer is over 5 inches thick.
ADDITIONAL DATA:
NASIS SITE ID - 02-JFD-06; NASIS PEDON ID - 02OR683006
NSSL analysis on the 4 to 11 inch depth zone (combined A and AEg horizons), sample number S02OR-035-007
Volcanic glass content in the A and AEg horizons is based on NSSL analysis on this pedon and on similar materials in Dilman soils (sample number S03OR-035-011, sampled as Chocknott)