LOCATION CHUCKSNEY OR
Tentative Series
TCM/JGM/EED
01/2018
CHUCKSNEY SERIES
Landscape--western Cascade Mountains
Landform--summits and shoulders of mountain slopes and glacial-valley walls
Slope--10 to 60 percent
Parent material--colluvium and residuum derived from hard igneous rock mixed with volcanic ash
Mean annual precipitation--about 2600 mm
Mean annual air temperature--about 6 degrees C
Depth class--deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Medial, amorphic Typic Melanocryands
TYPICAL PEDON: Chucksney medial loam in a meadow, on a southeast-facing slope of 50 percent at an elevation of 1665 m (When described on 8/5/2016, the soil was slightly moist throughout.)
A1--0 to 18 cm; medial silt loam, very dark grayish brown (10YR 3/2) dry, black (10YR 2/1) moist; moderate very fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and common fine roots; many very fine irregular pores; 10 percent gravel; strongly acid (pH 5.4); clear smooth boundary
A2--18 to 36 cm; medial silt loam, very dark grayish brown (10YR 3/2) dry, black (10YR 2/1) moist; moderate very fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and common fine roots; many very fine irregular pores; 12 percent gravel; strongly acid (pH 5.4); clear smooth boundary
A3--36 to 48 cm; medial silt loam, very dark grayish brown (10YR 3/2) dry, very dark brown (10YR 2/2) moist; moderate very fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and common fine roots; many very fine irregular pores; 14 percent gravel; strongly acid (pH 5.4); clear smooth boundary
Bw1--48 to 80 cm; gravelly medial loam, brown (10YR 5/3) dry, very dark grayish brown (10YR 3/2) moist; moderate very fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and common fine roots; many very fine irregular pores; 23 percent gravel and 5 percent cobbles; moderately acid (pH 5.6); clear smooth boundary
Bw2--80 to 110 cm; very stony medial loam, brown (10YR 5/3) dry, brown (10YR 4/3) moist; weak very fine granular structure; soft, very friable, nonsticky and nonplastic; common very fine and fine roots; many very fine irregular pores; 23 percent gravel and 5 percent cobbles; moderately acid (pH 5.6); clear smooth boundary
R--110 cm; indurated andesite
TYPE LOCATION: Linn County, Oregon, about 8 km west of Marion Forks, Oregon; 220 m north and 620 m west of southeast corner of section 15, T. 11 S., R. 06 E.; latitude 44.6169140, longitude -122.0449530; datum WGS 84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Soil moisture control section--dry 30 to less than 45 consecutive days
Mean annual soil temperature--4 to 6 degrees C
Thickness of melanic epipedon--30 to 50 cm
Thickness of andic soil properties--100 to 150 cm (below mineral soil surface)
All mineral horizons
*Clay content--10 to 18 percent
*1/3-bar bulk density--0.60 to 0.90 g/cm3
*Phosphate retention--greater than 85 percent
*Ammonium oxalate extractable Al + Fe--2 to 4 percent
*15-bar water retention--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
*Reaction--5.1 to 6.0
Particle-size control section
*Total fragment content--10 to 35 percent
*Clay content--10 to 18 percent
A horizon
Value--2 moist, 3 or 4 dry
Chroma--1 or 2 moist or dry
Fine-earth texture--medial silt loam, medial loam
Sand content--30 to 40 percent
Total fragment content--0 to 15 percent
Gravel content--0 to 15 percent
Cobble content--0 to 5 percent
Stone content--0 to 5 percent
Boulder content--0 to 5 percent
Organic matter content--12 to 20 percent
Melanic index--less than 1.7
Thickness--30 to 50 cm
Bw1 horizon
Value--3 or 4 moist, 5 or 6 dry
Chroma--2 or 3 moist or dry
Sand content--35 to 50 percent
Total fragment content--15 to 35 percent
Gravel content--15 to 30 percent
Cobble content--0 to 10 percent
Stone content--0 to 5 percent
Organic matter content--2 to 6 percent
Thickness--50 to 75 cm
Bw2 horizon
Value--3 or 4 moist, 5 or 6 dry
Chroma--2 or 3 moist or dry
Sand content--35 to 50 percent
Total fragment content--30 to 50 percent
Gravel content--20 to 35 percent
Cobble content--0 to 10 percent
Stone content--0 to 10 percent
Boulder content--0 to 10 percent
Organic matter content--2 to 6 percent
Thickness--50 to 75 cm
COMPETING SERIES: None
GEOGRAPHIC SETTING:
Elevation--1200 m to 1800 m
Climate--cold, wet winters; cool, dry summers
Mean annual precipitation--2300 to 2900 mm
Mean annual air temperature--5 to 7 degrees C
Frost-free period--60 to 90 days
Aspect--90 to 300 degrees
GEOGRAPHICALLY ASSOCIATED SOILS:
Tumble--umbric epipedon; on adjacent cirque headwalls and mountain slopes
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high throughout
USE AND VEGETATION:
Use--wildlife habitat, recreation
Potential natural vegetation--common beargrass, greenleaf fescue, red fescue, blue wildrye, broadleaf lupine, Cascade aster, fireweed, Saskatoon serviceberry
DISTRIBUTION AND EXTENT: Central western Cascade Mountains, Oregon; MLRA 3; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Willamette National Forest, Linn County, Oregon; name from Chucksney Mountain in Willamette National Forest
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Particle-size control section--zone from the surface to a depth of 100 cm
*Melanic epipedon--zone from the surface to a depth of 48 cm
*Volcanic glass--zone from the surface to a depth of 110 cm
*Andic soil properties--zone from the surface to a depth of 110 cm
*Cambic horizon--zone from 80 to 110 cm
*Depth to lithic contact--110 cm
National Cooperative Soil Survey
U.S.A.