LOCATION CHUCKSNEY OR
Tentative Series
TCM/JGM/MPR
12/2024
CHUCKSNEY SERIES
Landscape--western Middle Cascade glaciated mountains
Landform--mountaintops, mountain slopes, and glacial-valley walls
Slope--2 to 90 percent
Parent material--colluvium derived from volcanic rocks mixed with volcanic ash
Mean annual precipitation--about 2150 mm
Mean annual air temperature--about 7 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Medial, amorphic Pachic Fulvicryands
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.)
Oi--0 to 2 cm; slightly decomposed plant material; abrupt smooth boundary
A1--2 to 36 cm; medial 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; 2 percent krotovinas; 10 percent gravel; very strongly acid (pH 4.9 ); clear smooth boundary
A2--36 to 48 cm; medial 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; 2 percent krotovinas; 10 percent gravel; strongly acid (pH 5.4); clear smooth boundary
AB --48 to 80 cm; gravelly medial loam, brown (10YR 5/3) dry, very dark grayish brown (10YR 3/2) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine and common fine roots; many very fine irregular pores; 20 percent gravel and 5 percent cobbles; moderately acid (pH 5.6); clear smooth boundary
Bw--80 to 150 cm; very gravelly medial loam, brown (10YR 5/3) dry, brown (10YR 4/3) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine and fine roots; many very fine irregular pores; 25 percent gravel, 10 percent cobbles, and 5 percent stones; moderately acid (pH 5.6)
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:
Mean annual soil temperature--5 to 8 degrees C
Thickness of umbric epipedon--50 to 100 cm
Clay content--7 to 18 percent
1/3-bar bulk density--0.45 to 0.90 g/cm3
Phosphate retention--85 to 100 percent
Ammonium oxalate extractable Al plus 1/2 Fe--2 to 6 percent
15-bar water retention--30 to 70 percent (undried samples), greater than 15 percent (dried samples)
Volcanic glass content in 0.02- to 2.0-mm fraction--20 to 50 percent
A horizons
Value--2 moist, 3 or 4 dry
Chroma--1 or 2 moist or dry
Sand content--35 to 52 percent
Total fragment content--0 to 15 percent
Gravel content--0 to 15 percent
Cobble content--0 to 5 percent
Organic carbon content--6 to 12 percent
Reaction--pH 4.5 to 6.0
Thickness--25 to 50 cm
AB horizon
Value--2 or 3 moist, 4 or 5 dry
Chroma--2 to 4 moist or dry
Fine-earth texture--medial loam, medial sandy loam
Sand content--35 to 60 percent
Total fragment content--5 to 35 percent
Gravel content--5 to 30 percent
Cobble content--0 to 15 percent
Stone content--0 to 5 percent
Organic carbon content--3 to 9 percent
Reaction--pH 5.1 to 6.0
Thickness--25 to 75 cm
Bw horizon
Value--3 or 4 moist, 5 or 6 dry
Chroma--2 or 3 moist or dry
Fine-earth texture--medial loam, medial sandy loam
Sand content--35 to 65 percent
Total fragment content--15 to 50 percent
Gravel content--15 to 35 percent
Cobble content--0 to 15 percent
Stone content--0 to 10 percent
Organic carbon content--1 to 4 percent
Reaction--pH 5.1 to 6.0
COMPETING SERIES: None
GEOGRAPHIC SETTING:
Elevation--1100 m to 1800 m
Climate--cold, wet winters; mild, dry summers
Mean annual precipitation--1500 to 3600 mm
Mean annual air temperature--4 to 7 degrees C
Frost-free period--75 to 105 days
Aspect--generally south-facing
GEOGRAPHICALLY ASSOCIATED SOILS:
Tumble--averages greater than 35 percent rock fragments in the particle-size control section; located on cirque headwalls
Soapgrass--averages less than 6 percent organic carbon in an umbric epipedon; located on cirque floors, cirque headwalls, colluvial aprons, glacial-valley walls, mountains, and mountain slopes
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high
USE AND VEGETATION:
Use--timber production, water supply, wildlife habitat, recreation
Potential natural vegetation--meadow communities contain common beargrass, greenleaf fescue, red fescue, blue wildrye, and tall forbs including broadleaf lupine, Cascade aster, and fireweed; forested communities contain Pacific silver fir and grand fir
DISTRIBUTION AND EXTENT: western Cascade Mountains, Oregon; MLRA 3; moderate extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED: Willamette National Forest, Linn County, Oregon; name from Chucksney Mountain in Willamette National Forest
REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 2 to 102 cm
*Umbric epipedon--zone from 2 to 80 cm
*Volcanic glass--zone from 2 to 150 cm
*Andic soil properties--zone from 2 to 150 cm
*Cambic horizon--zone from 80 to 150 cm
8/2023--all mineral layers meet criteria 2 (no ash required) and 3 for andic soil properties in the 13th edition of Keys to Soil Taxonomy.
Type location user pedon ID--2016OR043778
National Cooperative Soil Survey
U.S.A.