LOCATION ANGELBASIN OR
Established Series
REV. RJO/JLW/DAL
11/2018
ANGELBASIN SERIES
Landscape--mountains
Landform--mountain slopes
Slope--0 to 90 percent
Parent material--thin mantle of volcanic ash over till derived from granite
Mean annual precipitation--about 990 mm
Mean annual air temperature--about 2 degrees C
Depth class--moderately deep to lithic bedrock
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Loamy-skeletal, isotic Andic Dystrocryepts
TYPICAL PEDON: Angelbasin ashy silt loam in an area of woodland, on a 25-percent, concave, northeast-facing slope at an elevation of 1900 m
Oi--0 to 3 cm; slightly decomposed needles and moss
A--3 to 18 cm; ashy silt loam, light yellowish brown (10YR 6/4) dry, brown (10YR 4/3) moist; weak medium subangular blocky structure; loose, very friable, nonsticky and nonplastic; common fine, medium, and coarse roots; common fine tubular pores; 5 percent gravel; moderately acid (pH 6.0); clear wavy boundary
Bw--18 to 33 cm; ashy silt loam, yellow (10YR 7/6) dry, yellowish brown (10YR 5/6) moist; weak medium and fine angular blocky structure; soft, very friable, nonsticky and nonplastic; common fine, medium, and coarse roots; few fine and common medium tubular pores; 5 percent gravel and 5 percent cobbles; moderately acid (pH 6.0); abrupt wavy boundary
2Bw--33 to 69 cm; extremely stony sandy loam, light yellowish brown (10YR 6/4) dry, dark yellowish brown (10YR 4/4) moist; weak medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; few fine and common medium and coarse roots; few fine tubular pores; 25 percent gravel, 20 percent cobbles, and 20 percent stones; moderately acid (pH 6.0); gradual smooth boundary
2C--69 to 99 cm; extremely stony loamy sand, very pale brown (10YR 7/4) dry, light yellowish brown (10YR 6/4) moist; single grain; loose, nonsticky and nonplastic; few fine, medium, and coarse roots; common fine irregular pores; 45 percent gravel, 20 percent cobbles, and 20 percent stones; moderately acid (pH 6.0); abrupt irregular boundary
2R--99 cm; granitic rock
TYPE LOCATION: Baker County, Oregon; in the NE1/4SW1/4NW1/4 of section 10, T. 7 S., R. 37 E.; latitude 44.9723511, longitude -118.1754913, datum WGS 84 (unknown how coordinates were determined)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--0 to 5 degrees C
Mean summer soil temperature--about 3 to 9 degrees C
Mean winter soil temperature--about -4 to 2 degrees C
Soil moisture--dry 30 to 45 consecutive days in summer
Depth to lithic contact--50 to 100 cm
Thickness of ash-influenced layers--18 to 36 cm
Estimated properties of layers influenced by volcanic ash
*Ammonium oxalate extractable Al + Fe--1.5 to 3.0 percent
*0.02- to 2.0-mm fraction--40 to 60 percent
*Volcanic ash content in 0.02- to 2.0-mm fraction--50 to 75 percent
*1/3-bar bulk density--0.75 to 1.00 g/cm3
*Phosphate retention--60 to 90 percent
*15-bar water retention--5 to 10 percent (dried samples)
*8 x Si plus 2 x Fe--5 to 10 percent
Particle-size control section
*Clay content--5 to 10 percent
*Total rock fragment content--35 to 75 percent
A horizon
Hue--7.5YR, 10YR
Value--3 or 4 dry, 4 to 6 moist
Chroma--3 or 4, dry or moist
Fine-earth texture--ashy silt loam
Clay content--4 to 6 percent
Sand content--30 to 40 percent
Organic matter content--1.0 to 4.5 percent
Total rock fragment content--5 to 35 percent
Gravel content--5 to 20 percent
Cobble content--0 to 10 percent
Stone content--0 to 10 percent
Reaction--5.1 to 6.0
Base saturation (NH4OAc)--15 to 35 percent
Thickness--8 to 15 cm
Bw horizon
Hue--7.5YR, 10YR
Value--5 to 7 dry, 3 to 5 moist
Chroma--4 to 6 dry or moist
Fine-earth texture--ashy silt loam
Clay content--2 to 6 percent
Sand content--40 to 50 percent
Organic matter content--0.5 to 2.5 percent
Total rock fragment content--10 to 35 percent
Gravel content--5 to 20 percent
Cobble content--5 to 10 percent
Stone content--0 to 10 percent
Reaction--5.6 to 7.3
Base saturation (NH4OAc)--15 to 35 percent
Thickness--15 to 28 cm
2Bw horizon
Value--5 or 6 dry, 3 or 4 moist
Chroma--3 or 4 dry or moist
Fine-earth texture--sandy loam, loamy sand
Clay content--5 to 10 percent
Sand content--60 to 85 percent
Organic matter content--2.5 to 4.0 percent
Total rock fragment content--35 to 65 percent
Gravel content--10 to 30 percent
Cobble content--10 to 25 percent
Stone content--10 to 20 percent
Reaction--5.1 to 7.3
Base saturation (NH4OAc)--20 to 40 percent
Thickness--15 to 36 cm
2C horizon
Value--5 to 7 dry, 3 or 4 moist
Chroma--3 or 4 dry or moist
Fine-earth texture--sandy loam, loamy sand
Clay content--0 to 5 percent
Sand content--60 to 85 percent
Organic matter content--0 to 2 percent
Total rock fragment content--45 to 85 percent
Gravel content--10 to 45 percent
Cobble content--15 to 25 percent
Stone content--15 to 25 percent
Reaction--5.6 to 7.3
Base saturation (NH4OAc)--20 to 40 percent
Thickness--13 to 46 cm
COMPETING SERIES:
McCay--deep to paralithic contact (weathered granite)
Prouty--moderately deep to paralithic contact (weathered granite)
Skinwood--medial andic soil properties; dry 0 to 30 consecutive days
Smokejump--ashy sandy loam in ash mantle
Tepeh--no lithic contact in the upper 150 cm
Twentymile--moderately deep to densic contact
Venson--sandy loam throughout
GEOGRAPHIC SETTING:
Lithology--granite
Elevation--1720 to 2380 m
Climate--cold, moist winters; cool, moist summers
Mean annual precipitation--680 to 1650 mm
Mean annual air temperature--1 to 4 degrees C
Frost-free period--10 to 65 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Hoffer--mantle of volcanic ash more than 35 cm thick; associated with more gently sloping, mid to lower, concave to planar slopes
Marblepoint--very deep; associated with slopes of glacial moraines
Muddycreek--layer of volcanic ash less than 18 cm thick; associated with steep, planar to convex slopes in forested areas
Mudlakebasin--mantle of volcanic ash more than 35 cm thick; on heavily forested glacial benches
Rockcreekbutte--layer of volcanic ash less than 18 cm thick; associated with steep, planar to convex slopes in forested areas
Pattenbutte--shallow; associated with moderately steep, south-facing slopes
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Saturation during normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--moderately high over high
USE AND VEGETATION:
Use--watershed, recreation, timber production, wildlife habitat
Native vegetation--subalpine fir, Engelmann spruce, lodgepole pine, Douglas-fir, western larch, grouse huckleberry, heartleaf arnica, darkwoods violet, big huckleberry, pinegrass, prince's pine, Utah honeysuckle, sweetcicely, sidebells wintergreen, elk sedge, lupine, pink mountain-heather, Sitka valerian, sickletop lousewort, skunkleaf polemonium, western meadow-rue, Ross' sedge
DISTRIBUTION AND EXTENT: Elkhorn and Wallowa Mountain Ranges of northeastern Oregon; MLRA 43C; moderate extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Wallowa-Whitman National Forest, Oregon; 2012
REMARKS:
Diagnostic horizons and other features in this pedon
*Ochric epipedon
*Cambic horizon--zone from 18 to 69 cm
*Volcanic glass--zone from 3 to 33 cm
*Andic soil properties--zone from 3 to 33 cm
*Depth to lithologic discontinuity--33 cm
*Particle-size control section--zone from 28 to 99 cm
5/2016--This official series description was updated according to SSR1 Technical Note 11--Content and Format of Official Series Descriptions (revised 12/2015). Most of the changes were in formatting; no major technical changes were made.
National Cooperative Soil Survey
U.S.A.