LOCATION SOCHOLIS                OR

Tentative Series
Rev. EN/CEG
03/2025

SOCHOLIS SERIES

Landscape--intermontane basin
Landform--flood plains, meandering channels, flood-plain steps, delta plains, and bars
Slope--0 to 2 percent
Parent material--interbedded diatomaceous and ashy alluvium
Mean annual precipitation--about 510 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: Loamy over ashy or ashy-pumiceous, aniso, mixed over glassy, superactive Aquandic Cryaquolls

TYPICAL PEDON: Socholis diatomaceous silt loam on a meandering channel in a willow-dominated meadow with a slope of 0 percent and an elevation of 1305 m.

Oe--0 to 6 cm; mucky peat; very strongly acid (pH 4.5); abrupt smooth boundary.

A1--6 to 14 cm; diatomaceous silt loam, grayish brown (10YR 5/2) dry, black (10YR 2/1) moist; strong fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine, common fine and medium, and few coarse roots throughout; common fine dendritic tubular pores; noneffervescent; slightly acid (pH 6.4); abrupt wavy boundary.

A2--14 to 27 cm; diatomaceous silt loam, grayish brown (10YR 5/2) dry, very dark gray (10YR 3/1) moist; moderate fine granular structure; slightly hard, friable, slightly sticky, slightly plastic; many very fine, common fine, and few medium and coarse roots throughout; common fine and few medium dendritic tubular pores; 2 percent fine faint irregular iron-manganese masses in matrix, brown (7.5YR 4/4) dry, very dark brown (7.5YR 2/2) moist; noneffervescent; neutral (pH 7.0); clear smooth boundary.

AB--27 to 50 cm; diatomaceous silt loam, grayish brown (10YR 5/2) dry, very dark grayish brown (10YR 3/2) moist; moderate coarse platy parting to moderate medium subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; common very fine and few fine, medium and coarse roots throughout; common fine dendritic tubular pores; 2 percent fine and medium faint irregular iron-manganese masses in matrix, brown (7.5YR 4/4) dry, very dark brown (7.5YR 2/2) moist; noneffervescent; neutral (pH 7.2); gradual smooth boundary.

Bw--50 to 76 cm; ashy fine sandy loam, grayish brown (10YR 5/2) dry, dark grayish brown (10YR 4/2) moist; weak medium subangular blocky structure; moderately hard, friable, nonsticky, nonplastic; common very fine and few fine, medium and coarse roots throughout; few medium dendritic tubular pores; 13 percent medium distinct irregular iron-manganese masses in matrix, brown (7.5YR 4/4) dry, black (7.5YR 2/1) moist; noneffervescent; neutral (pH 7.2); clear smooth boundary.

Bg1--76 to 95 cm; ashy loamy sand, brown (10YR 5/3) dry, dark grayish brown (10YR 4/2) moist; massive; moderately hard, friable, nonsticky, nonplastic; few very fine, fine and medium roots throughout; few fine and medium dendritic tubular pores; 13 percent medium distinct irregular iron-manganese masses in matrix, brown (7.5YR 4/4) dry, dark brown (7.5YR 3/3) moist; noneffervescent; neutral (pH 7.2); abrupt smooth boundary.

Bg2--95 to 130 cm; diatomaceous silt loam, gray (10YR 6/1) dry, dark gray (10YR 4/1) moist; massive; slightly hard, friable, slightly sticky, slightly plastic; few fine and medium dendritic tubular pores; 25 percent medium distinct irregular iron-manganese masses infused into matrix adjacent to pores, brown (7.5YR 4/4) dry, dark brown (7.5YR 3/4) moist; noneffervescent; slightly alkaline (pH 7.4); abrupt smooth boundary.

Bg3--130 to 170 cm; diatomaceous silt loam, gray (10YR 6/1) dry, grayish brown (10YR 5/2) moist; massive; slightly hard, friable, slightly sticky, slightly plastic; few fine and medium dendritic tubular pores; few fine and medium faint irregular iron-manganese masses in matrix, brown (7.5YR 4/4) dry, black (10YR 2/1) moist; moderate sulfurous odor; noneffervescent; neutral (pH 6.8); gradual smooth boundary.

Bg4--170 to 200 cm; ashy loamy sand, light brownish gray (10YR 6/2) dry, dark grayish brown (10YR 4/2) moist; massive; soft, friable, nonsticky, nonplastic; few fine and medium dendritic tubular pores; moderate sulfurous odor; noneffervescent; neutral (pH 6.6).

TYPE LOCATION: Klamath County, Oregon; about 3.2 miles north and 5.8 miles east of the town of Sprague River, OR; about 27 m west of the Sprague River stream bank; about 688.8 m north and 621.8 m east of the southwest corner of sec. 26, T.35S., R.9E., Willamette Meridian; Buttes of the Gods, Oregon USGS quadrangle; latitude 42.50747 degrees north, longitude 121.615900 degrees west, datum WGS84 (coordinates derived from gps unit)

RANGE IN CHARACTERISTICS:

*Mean annual soil temperature-- 6 to 8 degrees C
*Mean summer soil temperature-- 7 to 10 degrees C
*Mean winter soil temperature-- 4 to 9 degrees C
*Moisture control section--10 to 30 cm; saturated in all parts for 30 to 60 days from March thru May, dry in all parts for 45 to 90 or more days between July thru October.
*Rock fragment type--pumice paragravel; andesite or basalt gravel
*Mollic epipedon--30 to 160 cm thick
*Depth to ashy-modified soil textures having aquandic subgroup properties--35 to 55 cm from the mineral soil surface

Particle-size control section
*Rock fragment content, weighted average--0 to 5 percent
*Pararock fragment content, weighted average--0 to 10 percent
*Clay content, parts with ashy-modified soil textures--3 to 10 percent
*Clay content, parts without ashy-modified soil textures--12 to 35 percent

Estimated properties--horizons and layers having ashy textural modifiers
*Volcanic glass content--6 to 60 percent
*Ammonium oxalate extractable Al+1/2Fe--0.2 to 0.4 percent
*1/3-bar bulk density--1.0 to 1.35 g/cm3
*1500 kPa water (air-dried samples)--10 to 15 percent

A horizons
*Hue--10Y, 2.5Y, 10YR, or 7.5YR moist, 2.5Y or 10YR dry
*Value--2 to 3 moist, 4 to 7 dry
*Chroma--0 to 2 moist, 1 to 3 dry
*Fine-earth texture--ashy loamy sand, ashy fine sandy loam, ashy loam, mucky silt, diatomaceous silt loam
*Clay content--2 to 25 percent
*Paragravel content--0 to 10 percent
*gravel content--0 to 5 percent
*Reaction--moderately acid to slightly alkaline (pH 5.6 to 7.8)
*Thickness--30 to 165 cm

AB horizons or ABg horizons (where present)
*Hue--2.5Y or 10YR moist, 10YR or 7.5YR dry
*Value--2 to 5 moist, 5 to 7 dry
*Chroma--1 or 2, moist or dry
*Fine-earth texture--ashy coarse sandy loam, ashy sandy loam, diatomaceous silt loam
*Clay content--8 to 25 percent
*Paragravel content--0 to 40 percent
*gravel content--0 to 5 percent
*Reaction--slightly acid to neutral (pH 6.1 to 7.3)
*Thickness--0 to 75 cm

Bw horizons (where present)
*Hue--10YR or 7.5YR moist, 2.5Y or 10YR dry
*Value--2 to 5 moist, 5 to 7 dry
*Chroma--1 to 4, moist or dry
*Fine-earth texture--ashy loamy coarse sand, ashy loamy sand, ashy loamy fine sand, ashy coarse sandy loam, ashy sandy loam, ashy fine sandy loam, ashy loam, diatomaceous silt loam
*Clay content--1 to 25 percent
*Paragravel content--0 to 10 percent
*gravel content--0 to 5 percent
*Reaction--slightly acid to neutral (pH 6.1 to 7.3)
*Thickness--0 to 135 cm

Bg horizons (where present)
*Hue--5G, 2.5Y or 10YR moist, 10YR dry
*Value--3 to 5 moist, 5 to 7 dry
*Chroma--0 to 2 moist, 1 to 3 dry
*Fine-earth texture--ashy loamy coarse sand, ashy loamy sand, ashy loamy fine sand, ashy fine sandy loam, diatomaceous silt loam, clay loam, silty clay loam
*Clay content--1 to 35 percent
*Paragravel content--0 to 10 percent
*gravel content--0 to 5 percent
*Reaction--neutral to slightly alkaline(pH 6.6 to 7.8)
*Thickness--0 to 125 cm

COMPETING SERIES:
There are no series in this family at this time.

GEOGRAPHIC SETTING:
Elevation--1250 to 1700 m
Climate--cold moist winters and cool dry summers
Mean annual air temperature--5 to 8 degrees C
Mean annual precipitation--350 to 710 mm
Frost-free period--10 to 50 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Ontko--fine-loamy; on flood plains
Dilman--loamy over ashy or ashy pumiceous; on flood plains
Klamath--fine-silty and have less than 30 percent 0.02 to 2 mm particles in the control section; lower swales on flood plains
Yonna--loamy over ashy or ashy-pumiceous, aniso; ochric epipedon; somewhat poorly drained; on higher positions on flood plains
Outburst--ashy; on stream terraces

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--poorly drained
Seasonal high water table, endosaturation--water table is highest between January and April, at a depth of 0 to 100 cm, and is between 0 and 50 cm for more than 30 days during that time
Flooding--frequent, long; January through May
Saturated hydraulic conductivity--moderately high in the upper part (A and AB horizons), high in the lower part (Bw and Bg horizons)

USE AND VEGETATION:
Use--native meadow hay and pasture, irrigated hay and pasture, wildlife habitat
Vegetation--willow, tufted hairgrass, meadow barley, rush, sedge, Kentucky bluegrass

DISTRIBUTION AND EXTENT: Klamath and Shasta Valleys and Basins, Oregon; MLRA 21; small extent

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Davis, California

SERIES PROPOSED:
Klamath County, Northern Part, Oregon, 2020
Origin of the name--named after a nearby butte and topographic quadrangle map name

REMARKS:
Diagnostic horizons and features in this pedon
*Particle-size control section--the zone from 31 to 106 cm
*Mollic epipedon--the zone from 6 to 50 cm
*Aquandic soil properties--the zones from 50 to 95 cm and from 170 to 200 cm
*Cambic horizon--zone from 50 to 76 cm
*Aquic conditions--the conditions of endosaturation and reduction between the soil surface and 200 cm
*Redoximorphic concentrations--the zone from 14 to 170 cm
*Depleted matrix--the zone from 76 to 200 cm
*Some pedons have a Cg horizon below the Bg horizon(s)

ADDITIONAL DATA:
NASIS SITE ID--2006OR0353035
NASIS PEDON ID--2006OR0353035

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National Cooperative Soil Survey
U.S.A.