LOCATION MOOSERIDGE              OR

Tentative Series
JGM/KMS
01/2017

MOOSERIDGE SERIES


Landscape--western Cascade Mountains
Landform--earthflows with some on complex landslides
Slope--0 to 30 percent
Parent material--earthflow deposits derived from igneous rock mixed with volcanic ash in upper part
Mean annual precipitation--about 1700 mm
Mean annual air temperature--about 9 degrees C
Depth class--very deep
Drainage class--moderately well drained
Soil moisture regime--udic
Soil temperature regime--mesic
Soil moisture subclass--oxyaquic

TAXONOMIC CLASS: Fine-loamy, isotic, mesic Andic Oxyaquic Humudepts

TYPICAL PEDON: Mooseridge medial silt loam on a forested, south-facing, 7-percent slope at an elevation of 502 m (The soil was moist throughout when described on May 18, 2016.)

Oi--0 to 4 cm; slightly decomposed plant material; clear smooth boundary

A1--4 to 18 cm; medial silt loam, dark grayish brown (10YR 4/2) dry, very dark brown (10YR 2/2) moist; moderate fine granular structure; soft, very friable, nonsticky and slightly plastic; common very fine to coarse roots; many fine irregular pores and common fine dendritic tubular pores; moderately acid (pH 6.0); clear smooth boundary

A2--18 to 27 cm; medial loam, dark grayish brown (10YR 4/2) dry, very dark grayish brown (10YR 3/2) moist; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine to medium and few coarse roots; common fine irregular pores; moderately acid (pH 5.8); clear wavy boundary

2BA--27 to 40 cm; clay loam, dark yellowish brown (10YR 3/4) dry, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure; hard, firm, slightly sticky and moderately plastic; common very fine to medium and few coarse roots; common fine irregular and dendritic tubular pores; moderately acid (pH 5.8); gradual wavy boundary

2Bw1--40 to 75 cm; clay loam, brown (7.5YR 4/4) dry, dark brown (7.5YR 3/4) moist; moderate medium subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common very fine to coarse roots; common fine irregular dendritic tubular pores; 5 percent andesite gravel; moderately acid (pH 5.6); gradual smooth boundary

2Bw2--75 to 110 cm; silty clay loam, brown (7.5YR 4/4) dry, dark brown (7.5YR 3/4) moist; weak medium subangular blocky structure; slightly hard, firm, moderately sticky and moderately plastic; common fine and medium and few coarse roots; common fine irregular and dendritic tubular pores; 1 percent fine irregular masses of oxidized iron in matrix, dark yellowish brown (10YR 4/6) moist, and 2 percent medium platy manganese coatings on faces of peds; 5 percent andesite gravel; strongly acid (pH 5.4); gradual smooth boundary

2BC1--110 to 150 cm; clay loam, dark brown (7.5YR 3/4) dry, dark reddish brown (5YR 3/4) moist; weak coarse subangular blocky structure; slightly hard, firm, moderately sticky and moderately plastic; common fine and medium and few coarse roots; common fine irregular and dendritic tubular pores; 1 percent fine platy manganese coatings on faces of peds, 1 percent fine dendritic iron depletions along root channels, and 2 percent medium irregular masses of oxidized iron in matrix; 5 percent andesite gravel; strongly acid (pH 5.4); gradual smooth boundary

2BC2--150 to 175 cm; silty clay loam, dark brown (7.5YR 3/4) dry, dark reddish brown (5YR 3/4) moist; weak coarse subangular blocky structure; slightly hard, firm, very sticky and moderately plastic; common fine and medium roots; common fine irregular and dendritic tubular pores; 4 percent medium irregular masses of oxidized iron in matrix and 5 percent fine dendritic iron depletions along root channels; 5 percent andesite gravel and 2 percent andesite paragravel; strongly acid (pH 5.4)

TYPE LOCATION: Linn County, Oregon, about 24 km east of Sweet Home, in Willamette National Forest; 430 m north and 150 m east of the southwest corner of section 26, T. 13 S., R. 3 E., Willamette Meridian; latitude 44.40647, longitude -122.42043, datum WGS 84 (coordinates determined with a GPS)

RANGE IN CHARACTERISTICS:
Dry days--less than 45 consecutive days following summer solstice
Mean annual soil temperature--7 to 10 degrees C
Thickness of umbric epipedon--25 to 50 cm (below mineral soil surface)
Depth to redoximorphic features--50 to 100 cm
Thickness of andic soil properties--18 to 30 cm (below mineral soil surface)
Reaction--5.0 to 6.0 throughout all mineral horizons

Particle size control section
*Clay content--27 to 35 percent
*Total rock fragment content--10 to 35 percent

Estimated properties of layers with andic soil properties
*1/3-bar bulk density--0.7 to 0.9 g/cm3
*Phosphate retention--greater than 85 percent
*Ammonium oxalate extractable Al + Fe--2 to 4 percent
*15-bar water tension--30 to 70 percent (undried samples), greater than 15 percent (dried samples)
*0.02- to 2.0-mm fraction--greater than 30 percent
*Volcanic glass content in 0.02- to 2.0-mm fraction--5 to 30 percent

Oi horizon
*Thickness--1 to 10 cm

A horizon
*Hue--10YR
*Value--2 or 3 moist, 3 to 5 dry
*Chroma--1 or 2 moist, 2 or 3 dry
*Fine-earth texture--medial loam, medial silt loam
*Clay content--18 to 27 percent
*Sand content--20 to 45 percent
*Total fragment content--0 to 15 percent
*Gravel content--0 to 15 percent
*Paragravel content--0 to 5 percent
*Cobble content--0 to 5 percent
*Combined thickness--18 to 30 cm

2BA horizon (where present)
*Hue--10YR
*Value--2 or 3 moist, 3 to 5 dry
*Chroma--2 or 3 moist or dry
*Fine-earth texture--silty clay loam, clay loam, loam, silt loam
*Clay content--20 to 35 percent
*Sand content--20 to 40 percent
*Total fragment content--0 to 15 percent
*Gravel content--0 to 15 percent
*Paragravel content--0 to 10 percent
*Cobble content--0 to 5 percent
*Thickness--0 to 20 cm

2Bw horizon
*Hue--7.5YR, 10YR
*Value--3 or 4 moist, 4 to 6 dry
*Chroma--2 to 6 moist or dry
*Fine-earth texture--clay loam, silty clay loam
*Clay content--27 to 35 percent
*Sand content--15 to 35 percent
*Total fragment content--0 to 35 percent
*Gravel content--0 to 20 percent
*Paragravel content--0 to 15 percent
*Cobble content--0 to 10 percent

2BC horizon, and 2C horizon (where present)
*Hue--5YR to 10YR
*Value--3 or 4 moist, 4 to 6 dry
*Chroma--4 to 6 moist or dry
*Fine-earth texture--clay loam, silty clay loam
*Clay content--27 to 40 percent
*Sand content--15 to 30 percent
*Total fragment content--0 to 35 percent
*Gravel content--0 to 35 percent
*Paragravel content--0 to 30 percent
*Cobble content--0 to 10 percent

COMPETING SERIES: None

GEOGRAPHIC SETTING:
Elevation--200 to 700 m
Climate--warm, dry summers; cool, moist winters
Mean annual precipitation--1500 to 1900 mm
Mean annual air temperature--8 to 10 degrees C
Frost free period--120 to 150 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Kinney--no aquic conditions within profile; on similar landforms and mountain slopes
Tidbits--andic soil properties at a depth of greater than 36 cm; no aquic conditions; on similar landforms
Aschoff--greater than 35 percent rock fragments; no aquic conditions; on mountain slopes
Husky--aquic conditions within 30 cm of surface; in sags of complex landslides
Ramcreek--frigid soil temperature regime; on similar landforms

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--moderately well drained
Saturation in normal years--below a depth of 50 to 100 cm
Flooding--none
Ponding--none
Saturated hydraulic conductivity--moderately high

USE AND VEGETATION:
Use--watershed, recreation, wildlife habitat, timber production
Potential natural vegetation--Douglas-fir, western hemlock, vine maple, salal, dwarf Oregon grape, western swordfern, wild ginger, starry false Solomon's seal; commonly support a western hemlock/vine maple/swordfern-Northwest Oregon Cascades (CHS228) plant association

DISTRIBUTION AND EXTENT: Western Cascade Mountains, Oregon; MLRA 3; small extent

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon

SERIES PROPOSED: Willamette National Forest, Linn County, Oregon; name from landform in Linn County

REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Particle-size control section--zone from 29 to 104 cm
*Umbric epipedon--zone from 4 to 40 cm
*Cambic horizon--zone from 40 to 110 cm
*Andic soil properties--zone from 4 to 27 cm
*Volcanic glass--zone from 4 to 27 cm
*Aquic conditions--zone from 75 to 175 cm
*Depth to lithologic discontinuity--27 cm

06/2016--Assumed to meet criteria 2 (no ash required) for andic soil properties, in the 12th edition of Keys to Soil Taxonomy. It is also assumed that enough ash is present for the soils to meet criteria 3. Additional lab data is needed to confirm the degree of ash influence.

ADDITIONAL DATA: Type location user site ID--2016OR043903


National Cooperative Soil Survey
U.S.A.