LOCATION YOSSCREEK               OR

Tentative Series
Rev. CEG
02/2025

YOSSCREEK SERIES

Landscape--Pumice mantled plateau, Intermontane Basin
Landform--flood plains, bars
Slope--0 to 2 percent
Parent material--loamy alluvium including volcanic ash and minor amounts of diatomaceous sediments over sandy alluvium derived from coarse, pumiceous volcanic ash and pumiceous tephra
Mean annual precipitation--about 490 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: Yosscreek mucky ashy loam - meadow, on a 1 percent slope at 1400 m elevation.

A1--0 to 12 cm; highly organic ashy loam, dark gray (10YR 4/1) dry, black (10YR 2/1) moist; moderate fine granular structure; very friable, soft, nonsticky and nonplastic; many very fine and fine roots throughout; many very fine interstitial pores; 2 percent fine pumice paragravel; moderately acid (pH 5.6); abrupt smooth boundary

A2--12 to 50 cm; ashy loam, gray (10YR 5/1) dry, very dark gray (10YR 3/1) moist; weak very thick platy parting to strong fine granular structure; very friable, slightly hard, slightly sticky and slightly plastic; many very fine and common fine roots throughout; many very fine interstitial pores; 1 percent fine distinct irregular iron-manganese masses around pararock fragments, dark yellowish brown (10YR 4/4) dry, dark yellowish brown (10YR 3/4) moist; 5 percent fine and medium pumice paragravel; moderately acid (pH 6.0); clear smooth boundary

2Bg1--50 to 70 cm; paragravelly ashy loamy coarse sand, light brownish gray (10YR 6/2) dry, dark grayish brown (10YR 4/2) moist; single grain; loose, nonsticky and nonplastic; common very fine and few fine roots throughout; many very fine interstitial pores; 2 percent fine distinct irregular very strongly coherent iron-manganese nodules infused into matrix adjacent to pores, brown (10YR 4/3) dry, dark yellowish brown (10YR 3/4) moist, and 1 percent coarse distinct irregular moderately coherent iron-manganese nodules infused into matrix adjacent to pores, yellowish brown (10YR 5/4) dry, dark yellowish brown (10YR 4/4) moist; 30 percent fine and medium pumice paragravel; neutral (pH 6.6); clear smooth boundary

2Bg2--70 to 125 cm; paragravelly ashy coarse sand, light gray (10YR 7/2) dry, grayish brown (10YR 5/2) moist; single grain; loose, nonsticky and nonplastic; few very fine and fine roots throughout; many very fine interstitial pores; 1 percent fine prominent irregular iron-manganese masses in matrix, yellow (5Y 7/6) dry, olive yellow (5Y 6/6) moist, and 1 percent fine distinct irregular iron-manganese masses in matrix, brown (10YR 4/3) dry, dark yellowish brown (10YR 3/4) moist; 1 percent fine prominent irregular very strongly coherent iron-manganese nodules infused into matrix adjacent to pores, dark reddish brown (5YR 3/4) dry, dark reddish brown (5YR 3/2) moist; 30 percent fine and medium pumice paragravel; neutral (pH 6.8); gradual smooth boundary

2Bg3--125 to 200 cm; very paragravelly ashy coarse sand, light gray (2.5Y 7/2) dry, light brownish gray (10YR 6/2) moist; single grain; loose, nonsticky sand nonplastic; few very fine roots throughout; many very fine interstitial pores; 3 percent fine prominent irregular iron-manganese masses in matrix, yellow (5Y 7/6) dry, olive yellow (5Y 6/6) moist, and 1 percent fine distinct irregular iron-manganese masses in matrix, brown (10YR 4/3) dry, dark yellowish brown (10YR 3/4) moist; 1 percent fine prominent irregular very strongly coherent iron-manganese nodules infused into matrix adjacent to pores, dark reddish brown (5YR 3/4) dry, dark reddish brown (5YR 3/2) moist; 45 percent fine and medium pumice paragravel; neutral (pH 7.0)

TYPE LOCATION: Klamath County, Oregon; in Skellock Draw, about 21 miles north and 12 miles east of the town of Chiloquin, Oregon; about 350 m north and 122 m west of the southeast corner of Section 7, Township 31 S, Range 10 E; Willamette Meridian; Wildhorse Ridge, Oregon U. S. Geological Survey quadrangle; latitude 42.8956680 degrees north, longitude 121.5652771 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-- 1.0 to 6.0 degrees C
Moisture control section--20 to 60 cm; aquic regime; saturated (endosaturation) in some part for 30 to 90 days from March through June in normal years
Thickness of mollic epipedon--20 to 70 cm
Rock fragments--fine and medium (2 to 20 mm) pumice paragravel;
Organic matter--regular decrease with depth within the material above the lithologic discontinuity
Depth to redox concentrations--0 to 50 cm
Depth to aquic conditions--0 to 50 cm
Depth to lithologic discontinuity--30 to 120 cm

Particle-size control section
*Clay content--5 to 18 percent (weighted average)
*Pumice rock fragment content--5 to 30 percent (weighted average)

Estimated andic properties:
*Ammonium oxalate extractable Al plus 1/2 Fe--0.2 to 0.4 percent upper part; 0 to 0.2 percent lower part
*Medium to very coarse sand in the .02 to 2.0 mm fraction--greater than 50 percent
*P-retention--3 to 25 percent
*Volcanic glass content--30 to 90 percent glass and glass-coated aggregates
*1/3-bar bulk density--0.60 to 1.10 g/cm3
*1500 kPa water (air-dried samples)--15 to 40 percent upper part; 5 to 25 percent lower part

Oa horizon (present in some pedons)
*Thickness--0 to 10 cm

A horizons
Hue--10YR or 2.5Y, moist or dry
Value--2 or 3 moist, 4 or 5 dry
Chroma--1 or 2, moist or dry
Fine-earth texture--ashy coarse sandy loam, ashy loam, highly organic ashy loam, ashy silt loam
Clay content--5 to 26 percent
Paragravel content--0 to 15 percent
Reaction--strongly acid to slightly acid (pH 5.1 to 6.5)
Organic matter content--1 to 20 percent
Thickness--20 to 70 cm

2Bg horizons (or 2Bw horizons, present in some pedons)
Hue--10YR or 2.5Y, moist or dry
Value--3 to 7 moist, 5 to 8 dry
Chroma--1 to 3 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
Paragravel content--0 to 75 percent
Reaction--slightly acid or neutral (pH 6.1 to 7.3)
Organic matter content--0.1 to 2 percent

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; less than 50 percent medium to very coarse sand in the .02 to 2.0 mm fraction
Liart--tuffaceous alluvium (not pumiceous sand); 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--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
Outburst--ashy coarse sand or ashy loamy coarse sand textures in A horizons, 0 to 5 percent pumice paragravel in the particle-size control section and throughout all horizons

GEOGRAPHIC SETTING:
Elevation--1250 to 1825 m
Climate--cold, moist winters and cool, dry summers
Mean annual air temperature-- 4 to 7 degrees C
Mean annual precipitation--340 to 1500 mm
Frost-free period--5 to 25 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Chemult--on floodplains; histic epipedon; loamy over ashy or ashy-pumiceous particle size class; limnic, diatomaceous silts over pumiceous sand alluvium; frequent, very long flooding (very poorly drained)
Chinchallo--on floodplains and relict lakebeds; ochric epipedon; loamy over ashy or ashy-pumiceous particle size class; limnic, diatomaceous silts over pumiceous sand alluvium
Chocknott--on alluvial fans, drainageways, flood plains, and stream terraces; umbric epipedon; ashy particle-size class; pumiceous sand alluvium
Regcrust--on alluvial fans and drainageways; ochric epipedon; ashy particle-size class; 100 to 140 cm to aquic conditions (moderately well drained); pumiceous sand alluvium
Skellock--on relict lakeshores on pyroclastic flows and volcanic fields; ochric epipedon; ashy-pumiceous particle-size class; 50 to 100 cm to aquic conditions (somewhat poorly drained); pumiceous sand alluvium
Socholis--on flood plains, meandering channels, flood-plain steps, delta plains, and bars; mollic epipedon; loamy over ashy or ashy-pumiceous particle size class; interbedded diatomaceous and pumiceous sand alluvium

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--poorly drained
Saturation in normal years--endosaturation in some part between 0 and 50 cm from the soil surface for 30 to 90 days from March through June
Flooding--occasional, long flooding, April through June
Ponding--none
Saturated hydraulic conductivity (Ksat)--moderately high to high above the lithologic discontinuity (A horizons); high to very high below the lithologic discontinuity (2Bg horizons)

USE AND VEGETATION:
Use--native meadow hay and 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, 2015
Origin of the name--the name is derived from a nearby creek, Yoss Creek

REMARKS:
Diagnostic horizons and features in this pedon
*Mollic epipedon--zone from 0 to 50 cm
*Volcanic glass--throughout (zone from 0 to 200 cm)
*Aquic conditions--zone from 0 to 200 cm
*Redoximorphic concentrations--zone from 12 to 200 cm
*Redoximorphic depletions--zone from 50 to 200 cm (depleted matrix)
*Particle-size control section--zone from 25 to 100 cm

NASIS Site ID 99-JFD-03
and Pedon ID 03OR035011

ADDITIONAL DATA:
Kellogg Soil Survey Laboratory (KSSL) characterization--04N0355 (NASIS Site ID 99-JFD-03; NASIS pedon ID 03OR035011)

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National Cooperative Soil Survey
U.S.A.