LOCATION OUTBURST OR
Tentative Series
Rev. CEG
02/2025
OUTBURST SERIES
Landscape--Intermontane Basin
Landform--flood-plain steps, meandering channels, valley floors
Slope--0 to 2 percent
Parent material--sandy alluvium derived from coarse pumiceous volcanic ash and pumiceous tephra over loamy alluvium including volcanic ash and diatomaceous sediments
Mean annual precipitation--about 430 mm
Mean annual air temperature--about 6 degrees C
Depth class--very deep
Drainage class--poorly drained
Soil moisture regime--aquic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Ashy, glassy Aquandic Cryaquolls
TYPICAL PEDON: Outburst ashy coarse sandy loam - grazed pasture, on a 1 percent slope at 1320 m elevation.
Oa--0 to 2 cm; highly decomposed plant material, brown (10YR 4/3) dry, very dark grayish brown (10YR 3/2) moist; weak fine granular structure; very friable, soft, nonsticky and nonplastic; many very fine, common fine, and few medium roots; common very fine dendritic tubular pores; neutral (pH 6.8); abrupt smooth boundary
A1--2 to 9 cm; ashy loamy coarse sand, grayish brown (10YR 5/2) dry, black (10YR 2/1) moist; moderate fine granular structure; very friable, soft, nonsticky and nonplastic; many very fine and common fine and medium roots; common very fine dendritic tubular pores; slightly acid (pH 6.3); clear smooth boundary
A2--9 to 62 cm; ashy loamy coarse sand, gray (10YR 5/1) dry, black (10YR 2/1) moist; moderate fine granular structure; very friable, soft, nonsticky and nonplastic; few very fine and fine and common medium roots; common fine dendritic tubular pores; 4 percent fine and medium faint irregular iron-manganese masses with diffuse boundaries in matrix, brown (7.5YR 4/3) dry, very dark brown (7.5YR 2.5/2) moist; slightly acid (pH 6.4); clear smooth boundary
Bg1--62 to 105 cm; ashy loamy coarse sand, gray (10YR 6/1) dry, dark grayish brown (10YR 4/2) moist; single grain; loose, nonsticky and nonplastic; few very fine, fine, and medium roots; common fine dendritic tubular pores; 2 percent fine and medium distinct irregular iron-manganese masses with diffuse boundaries in matrix, dark yellowish brown (10YR 3/6) moist; neutral (pH 6.9); clear smooth boundary
Bg2--105 to 120 cm; ashy coarse sand, light gray (10YR 7/1) dry, dark gray (10YR 4/1) moist; single grain; loose, nonsticky and nonplastic; neutral (pH 7.1); gradual smooth boundary
Bg3--120 to 145 cm; ashy coarse sand, light brownish gray (10YR 6/2) dry, dark grayish brown (10YR 4/2) moist; single grain; loose, nonsticky and nonplastic; 5 percent fine and medium distinct irregular iron depletions with diffuse boundaries in matrix, light brownish gray (2.5Y 6/2) moist, and 30 percent medium prominent irregular iron depletions with diffuse boundaries in matrix, dark greenish gray (5BG 4/1) moist; 5 percent fine and medium prominent irregular iron-manganese masses with diffuse boundaries in matrix, reddish brown (5YR 4/4) moist; neutral (pH 7.0); clear smooth boundary
2ABgb--145 to 175 cm; ashy diatomaceous loam, gray (10YR 5/1) dry, very dark grayish brown (10YR 3/2) moist; massive; very friable, moderately hard, nonsticky and nonplastic; 2 percent fine prominent irregular iron depletions with diffuse boundaries in matrix, greenish black (10Y 2.5/1) moist; neutral (pH 7.2); clear smooth boundary
2Bgb--175 to 200 cm; ashy loam, pale yellow (2.5Y 7/3) dry, dark yellowish brown (10YR 3/4) moist; massive; very friable, moderately hard, slightly sticky and slightly plastic; 5 percent fine and medium distinct irregular iron-manganese masses with diffuse boundaries in matrix, reddish brown (5YR 4/4) moist; 5 percent medium prominent irregular iron depletions with diffuse boundaries in matrix, greenish black (10Y 2.5/1) moist; neutral (pH 7.2)
TYPE LOCATION: Klamath County, Oregon; about 6.1 miles north and 2.0 miles east of the town of Beatty, Oregon; about 283 m north and 224 m east of the southwest corner of Section 16, Township 35 S, Range 12 E; Willamette Meridian; Spodue Mountain, Oregon U. S. Geological Survey quadrangle; latitude 42.531295 degrees north, longitude 121.307279 degrees west, datum WGS 84 (coordinates derived from GPS unit)
RANGE IN CHARACTERISTICS:
Soil Temperature: cryic regime
Mean annual soil temperature-- 3.0 to 8.0 degrees C
Mean summer soil temperature-- 7.0 to 12.0 degrees C
Mean winter soil temperature-- 0.0 to 6.0 degrees C
Moisture control section--30 to 90 cm; aquic regime; saturated in some part for 30 to 90 days from March through June; seasonally high water table (endosaturation) has an upper limit between 5 and 50 cm below the surface in normal years
Thickness of mollic epipedon--25 to 80 cm
Rock fragments--fine (2 to 4 mm) pumice paragravel; volcanic rock gravel
Organic matter--regular decrease with depth within the material above the lithologic discontinuity
Depth to redox concentrations--5 to 50 cm
Depth to aquic conditions--5 to 50 cm
Depth to lithologic discontinuity (when present)--greater than 100 cm
Particle-size control section
*Clay content--0 to 12 percent (weighted average)
*Pumice rock fragment content--0 to 2 percent
Estimated andic properties, all mineral horizons above the lithologic discontinuity:
*Ammonium oxalate extractable Al plus 1/2 Fe--0.05 to 0.2 percent
*Medium to very coarse sand in the .02 to 2.0 mm fraction--greater than 50 percent
*P-retention--3 to 20 percent
*Volcanic glass content--30 to 70 percent glass and glass-coated aggregate
*1/3-bar bulk density--0.75 to 1.10 g/cm3
*1500 kPa water (air-dried samples)--5 to 25 percent
Oa horizon (where present)
*Thickness--0 to 10 cm
A horizons
Value--2 or 3 moist, 3 to 5 dry
Chroma--1 or 2, moist or dry
Fine-earth texture--ashy coarse sand, ashy loamy coarse sand, ashy coarse sandy loam
Clay content--5 to 15 percent
Total rock and pararock content--0 to 7 percent
Paragravel content--0 to 5 percent
Gravel content--0 to 2 percent
Reaction--slightly acid to neutral (pH 6.1 to 7.3)
Organic matter content--1 to 10 percent
Thickness--25 to 80 cm
Bg horizons
Hue--5G, 2.5Y, or 10YR moist; 2.5Y or 10YR dry
Value--3 to 5 moist, 6 or 7 dry
Chroma--0 to 2 moist; 1 or 2 dry
Fine-earth texture--ashy coarse sand, ashy loamy coarse sand, ashy coarse sandy loam
Clay content--0 to 15 percent
Total rock and pararock content--0 to 7 percent
Paragravel content--0 to 5 percent
Gravel content--0 to 2 percent
Reaction--slightly acid to slightly alkaline (pH 6.1 to 7.8)
Organic matter content--0.1 to 2 percent
Thickness--20 to 145 cm
2ABgb horizons (when present)
Hue--2.5Y or 10YR, moist or dry
Value--2 or 3 moist, 3 to 5 dry
Chroma--1 to 3, moist or dry
Fine-earth texture--ashy loam, diatomaceous ashy loam, diatomaceous silt loam
Clay content--15 to 26 percent
Total rock and pararock content--0 to 4 percent
Paragravel content--0 to 2 percent
Gravel content--0 to 2 percent
Reaction--neutral to slightly alkaline (pH 6.6 to 7.8)
Organic matter content--0.5 to 4 percent
Thickness--0 to 50 cm
2Bgb horizons (when present)
Hue--2.5Y or 10YR, moist or dry
Value--2 or 3 moist, 3 to 7 dry
Chroma--1 to 4, moist or dry
Fine-earth texture--ashy loam, ashy clay loam, silty clay loam
Clay content--15 to 35 percent
Total rock and pararock content--0 to 4 percent
Paragravel content--0 to 2 percent
Gravel content--0 to 2 percent
Organic matter content--0.1 to 1 percent
Reaction--neutral to slightly alkaline (pH 6.6 to 7.8)
COMPETING SERIES:
Dismalswamp--more than 35 percent rock fragments within 50 to 100 cm of the soil surface; 15 to 35 percent rock fragments in the particle-size control section; have fine-earth textures of ashy sandy loam and finer; less than 50 percent medium to very coarse sand in the .02 to 2.0 mm fraction
Liart--tuffaceous alluvium (not pumiceous sand); surface textures of mucky silt loam, ashy loam, or ashy silt loam with 15 to 27 percent clay; greater than 18 percent clay throughout the particle-size control section; less than 50 percent medium to very coarse sand in the .02 to 2.0 mm fraction
Longdrive--12 to 18 percent clay in the particle-size control section; less than 50 percent medium to very coarse sand in the .02 to 2.0 mm fraction; irregular decrease in organic matter content throughout the soil due to textural stratification
Lousecreek--diatomaceous clay textures in A horizons, high in diatoms, sponge spicules, and volcanic glass in silt, very fine sand, and fine sand fractions
Yosscreek--ashy loam textures A horizons, 5 to 30 percent pumice paragravel in the particle-size control section and up to 50 percent pumice paragravel in Bg horizons
GEOGRAPHIC SETTING:
Elevation--1250 to 1475 m
Climate--cold, moist winters and cool, dry summers
Mean annual air temperature-- 4 to 7 degrees C
Mean annual precipitation--350 to 660 mm
Frost-free period--10 to 50 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Godowa--on flood plain steps and terraces; upper depth of seasonal high water table and redoximorphic features is 50 cm (somewhat poorly drained); ochric epipedon; frigid soil temperature regime
Klamath--on flood plains; seasonal high water table and redoximorphic features at the soil surface (poorly drained); silt loam or silty clay loam textures; mollic epipedon
Ontko--on flood plains; seasonal high water table and redoximorphic features at the soil surface (poorly drained); clay loam, ashy sandy clay loam and sandy loam textures
Sycan--on stream terraces; upper depth of seasonal high water table and redoximorphic features is 100 cm (moderately well drained); ochric epipedon
Yonna--on flood plain steps; interbedded loamy and sandy textures; upper depth of seasonal high water table and redoximorphic features is between 50 and 100 cm (somewhat poorly drained); ochric epipedon
DRAINAGE AND PERMEABILITY:
Drainage class--poorly drained
Saturation in normal years--endosaturation, below a depth of 5 to 50 cm, in February through June; below a depth of 50 cm in July through January
Flooding--occasional, brief flooding, February through May
Ponding--none
Saturated hydraulic conductivity (Ksat)--high to very high above the lithologic discontinuity; moderately low to high below the lithologic discontinuity
USE AND VEGETATION:
Use--native meadow hay and pasture, irrigated pasture, and wildlife
Vegetation-- tufted hairgrass, redtop, meadow barley, rush, sedge, and Kentucky bluegrass
DISTRIBUTION AND EXTENT: Cascade Mountains, Eastern Slope, Oregon; MLRA 6; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED:
Klamath County Oregon, 2018
Origin of the name--the name is coined
REMARKS:
Diagnostic horizons and features in this pedon
*Mollic epipedon--zone from 2 to 62 cm
*Volcanic glass--throughout (zone from 2 to 200 cm)
*Aquic conditions--zone from 9 to 200 cm
*Redoximorphic concentrations--zone from 9 to 200 cm
*Redoximorphic depletions--zone from 62 to 200 cm (includes depleted matrix zone from 62 to 145 cm)
*Particle-size control section--zone from 27 to 102 cm
*Pumice and ash are originally from Mt. Mazama, deposited during a subsequent outburst flood
NASIS Site and Pedon ID S2018OR035001
ADDITIONAL DATA:
Kellogg Soil Survey Laboratory (KSSL) characterization--19N0328 (NASIS Site and pedon ID S2018OR035001)
National Cooperative Soil Survey
U.S.A.