LOCATION GRANITEMOUNTAIN OR
Established Series
IRD. RJO/DAL/KMS
01/2019
GRANITEMOUNTAIN SERIES
Landscape--mountains
Landform--mountain slopes
Slope--15 to 90 percent
Parent material--colluvium derived from granite with an influence of volcanic ash in the upper part
Mean annual precipitation--about 1080 mm
Mean annual air temperature--about 0 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--cryic
Soil moisture subclass--typic
TAXONOMIC CLASS: Loamy-skeletal, isotic Vitrixerandic Humicryepts
TYPICAL PEDON: Granitemountain extremely gravelly ashy loam in an area of rangeland, on a 25-percent, southeast-facing slope at an elevation of 1975 m
A1--0 to 30 cm; extremely gravelly ashy loam, dark grayish brown (2.5Y 4/2) dry, very dark grayish brown (2.5Y 3/2) moist; weak to moderate fine granular structure; soft, very friable, slightly sticky and slightly plastic; many fine roots; many fine and common medium irregular pores; 55 percent gravel, 10 percent cobbles, and 5 percent stones; moderately acid (pH 6.0); gradual smooth boundary
A2--30 to 66 cm; extremely gravelly ashy loam, dark grayish brown (2.5Y 4/2) dry, very dark grayish brown (2.5Y 3/2) moist; weak fine and medium subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; many fine roots; many fine and common medium irregular pores; 55 percent gravel, 10 percent cobbles, and 5 percent stones; moderately acid (pH 6.0); gradual smooth boundary
2C--66 to 155 cm; extremely gravelly loam, dark grayish brown (2.5Y 4/2) dry, very dark grayish brown (2.5Y 3/2) moist; massive; soft, very friable, slightly sticky and slightly plastic; few fine roots; common fine and few medium irregular pores; 55 percent gravel, 10 percent cobbles, and 5 percent stones; moderately acid (pH 6.0)
TYPE LOCATION: Baker County, Oregon; in the SE1/4SE1/4NE1/4 of section 26, T. 8 S., R. 37 E.; Bourne U.S. Geological Survey quadrangle; latitude 44.8409657, longitude -118.1388237, datum WGS 84 (source of coordinates unknown)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--about -1 to 3 degrees C
Mean summer soil temperature--about 2 to 7 degrees C
Mean winter soil temperature--about -4 to 2 degrees C
Soil moisture control section--dry 45 to 60 consecutive days in summer
Thickness of umbric epipedon--45 to 110 cm
Thickness of ash-influenced layers--45 to 110 cm
Estimated properties of layers influenced by volcanic ash
*Ammonium oxalate extractable Al + 1/2 Fe--0.7 to 1.0 percent
*Glass content in 0.02- to 2.0-mm fraction--5 to 25 percent
Particle-size control section
*Clay content--4 to 10 percent
*Total rock fragment content--35 to 75 percent
A1 horizon
Moist color--10YR 2/2, 10YR 3/2, 10YR 3/3, 2.5Y 3/2
Dry color--10YR 3/3, 10YR 4/3, 10YR 5/3, 2.5Y 4/2
Fine-earth texture--ashy silt loam, ashy loam, ashy sandy loam
Clay content--4 to 10 percent
Sand content--45 to 50 percent
Organic matter content--2.5 to 8 percent
Total rock fragment content--30 to 70 percent
Gravel content--20 to 55 percent
Cobble content--5 to 20 percent
Stone content--0 to 10 percent
Reaction--5.1 to 6.5
Base saturation (NH4OAc)--40 to 50 percent
Thickness--20 to 60 cm
A2 horizon, and AB, BA, or Bw horizon (where present)
Moist color--10YR 3/3, 2.5Y 3/2
Dry color--10YR 4/3, 10YR 5/3, 10YR 5/4, 2.5Y 4/2, 2.5Y 5/4
Fine-earth texture--ashy silt loam, ashy loam, ashy sandy loam
Clay content--4 to 10 percent
Sand content--40 to 55 percent
Organic matter content--2 to 4 percent
Total rock fragment content--40 to 70 percent
Gravel content--20 to 55 percent
Cobble content--5 to 25 percent
Stones--0 to 15 percent
Reaction--5.1 to 6.0
Base saturation (NH4OAc)--15 to 50 percent
Thickness of A2 horizon--25 to 60 cm
2C horizon
Moist color--10YR 3/3, 10YR 4/4, 2.5Y 3/2, 2.5Y 4/4
Fine-earth texture--silt loam, loam, sandy loam
Clay content--4 to 8 percent
Sand content--30 to 65 percent
Organic matter content--0.3 to 1.0 percent
Total rock fragment content--65 to 85 percent
Gravel content--30 to 70 percent
Cobble content--10 to 35 percent
Stone content--5 to 15 percent
Reaction--5.1 to 6.0
COMPETING SERIES:
Dollarlake--base saturation (NH4OAc) of 50 percent or more in more than one-half of the thickness between 25 and 75 cm (eutric); rounded or subrounded fragments of basalt till
Fruitcreek--50 to 100 cm (moderately deep) to a lithic contact (argillite); base saturation (NH4OAc) of 50 percent or more in more than one-half of the thickness between 25 to 75 cm (eutric); angular rock fragments of argillite and metasedimentary colluvium
Leespeak--50 to 100 cm (moderately deep) to a lithic contact (granite)
GEOGRAPHIC SETTING:
Elevation--1950 to 2470 m
Climate--cold, wet winters; cool, dry summers
Mean annual precipitation--750 to 1590 mm
Mean annual air temperature-- -1 to 2 degrees C
Frost-free period--15 to 60 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Moodybasin--on moraines in glaciated valleys; under green fescue, lupine, and scattered subalpine fir; moderately deep to a densic contact
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Saturation during normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--high
USE AND VEGETATION:
Use--watershed, wildlife habitat, recreation
Native vegetation--subalpine fir, Engelmann spruce, lodgepole pine, Douglas-fir, western larch, grouse huckleberry, pink mountainheath, heartleaf arnica, elk sedge, pinegrass, violet, prince's pine, Virginia strawberry, myrtle pachystima, pyrola, sweetcicely, Ross' sedge, whitebark pine
Plant association--ABLA(PIAL)/POPH
DISTRIBUTION AND EXTENT: Blue Mountains of northeastern Oregon; MLRA 43C; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Wallowa-Whitman National Forest, Oregon; 2018
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Umbric epipedon--zone from the surface to a depth of 66 cm
*Volcanic glass--zone from the surface to a depth of 66 cm
*Particle-size control section--zone from 25 to 100 cm
*Low base saturation (dystric)--zone from the surface to a depth of 155 cm (base saturation less than 50 percent throughout profile)
*Cambic horizon--in some pedons
National Cooperative Soil Survey
U.S.A.