LOCATION ANTELOPEPEAK            OR

Established Series
Rev. JLW/RJO/DAL/KMS
11/2018

ANTELOPEPEAK SERIES

Landscape--mountains
Landform--mountain slopes, glaciated mountain valleys
Slope--0 to 30 percent
Parent material--thick mantle of volcanic ash over outwash derived from granite
Mean annual precipitation--about 820 mm
Mean annual air temperature--about 5 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--frigid
Soil moisture subclass--typic

TAXONOMIC CLASS: Ashy over loamy, aniso, amorphic over isotic, frigid Typic Vitrixerands

TYPICAL PEDON: Antelopepeak gravelly ashy sandy loam in an area of woodland, on an 8-percent, south-facing slope at an elevation of 1575 m

Oi--0 to 3 cm; needles and twigs

E--3 to 15 cm; gravelly ashy sandy loam, light gray (10YR 7/2) dry, brown (10YR 5/3) moist; single grain; loose, nonsticky and nonplastic; common fine and medium roots; common fine irregular pores; 25 percent gravel; strongly acid (pH 5.1); clear smooth boundary

Bw--15 to 28 cm; ashy silt loam, very pale brown (10YR 7/4) dry, yellowish brown (10YR 5/6) moist; weak medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; many fine and common medium and coarse roots; common fine irregular pores; 10 percent gravel; moderately acid (pH 6.0); clear smooth boundary

BC--28 to 61 cm; ashy very fine sandy loam, very pale brown (10YR 8/2) dry, light yellowish brown (10YR 6/4) moist; weak medium and fine angular blocky structure; soft, very friable, nonsticky and nonplastic; common fine and medium and few coarse roots; common fine irregular pores; moderately acid (pH 6.0); abrupt wavy boundary

2Ab--61 to 66 cm; sandy loam, grayish brown (10YR 5/2) dry, very dark grayish brown (10YR 3/2) moist; weak medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; few fine and medium roots; many fine irregular pores; slightly acid (pH 6.5); gradual smooth boundary

2Eb--66 to 94 cm; coarse sandy loam, light brownish gray (10YR 6/2) dry, dark grayish brown (10YR 4/2) moist; single grain; loose, nonsticky and nonplastic; few fine and medium roots; many fine irregular pores; neutral (pH 7.0); gradual smooth boundary

2BCb--94 to 109 cm; sandy loam, light brownish gray (10YR 6/2) dry, brown (10YR 5/3) moist; single grain; loose, nonsticky and nonplastic; many fine irregular pores; 5 percent gravel; slightly acid (pH 6.5); gradual smooth boundary

2C--109 to 157 cm; coarse sandy loam, light gray (10YR 7/2) dry, grayish brown (10YR 5/2) moist; single grain; loose, nonsticky and nonplastic; many fine irregular pores; 5 percent gravel; moderately acid (pH 6.0)

TYPE LOCATION: Grant County, Oregon; in the NE1/4NW1/4NW1/4 of section 27, T. 6 S., R. 37 E.; Anthony Butte U.S. Geological Survey quadrangle; latitude 45.0187927, longitude -118.1719869, Datum WGS84 (Coordinates estimated from pin prick on a map)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--5 to 7 degrees C
Mean summer soil temperature--9 to 11 degrees C
Mean winter soil temperature--0 to 3 degrees C
Soil moisture--dry 45 to 60 days in summer
Thickness of ash-influenced layers--0 to 75 cm

Estimated properties of E horizon influenced by volcanic ash
*Ammonium oxalate extractable Al + 1/2 Fe--0.2 to 1.0 percent
*0.02- to 2.0-mm fraction--40 to 70 percent
*Volcanic ash content in 0.02- to 2.0-mm fraction--5 to 30 percent
*Phosphate retention--20 to 40 percent
*15-bar water retention--5 to 10 percent (dried samples)
*8 x Si plus 2 x Fe--1 to 3 percent
*8 x Si minus 2 Fe--0 to 1 percent

Estimated properties of Bw and BC horizons influenced by volcanic ash
*Ammonium oxalate extractable Al + 1/2 Fe--1.0 to 2.5 percent
*0.02- to 2.0-mm fraction--40 to 60 percent
*Volcanic ash content in 0.02- to 2.0-mm fraction--30 to 60 percent
*1/3-bar bulk density--0.65 to 1.00 g/cm3
*Phosphate retention--55 to 85 percent
*15-bar water retention--5 to 12 percent (dried samples)
*8 x Si plus 2 x Fe--5 to 12 percent
*8 x Si minus 2 Fe--4 to 8 percent

Particle-size control section
*Upper part--13 to 25 cm thick; 5 to 9 percent clay; 0 to 25 percent total rock fragments
*Middle part--36 to 56 cm thick; 3 to 8 percent clay; 0 to 10 percent total rock fragments
*Lower part--33 to 53 cm thick; 4 to 10 percent clay; 0 to 30 percent total rock fragments

E horizon
Hue--10YR
Value--4 or 5 moist, 6 or 7 dry
Chroma--3 or 4 moist, 2 to 4 dry
Fine-earth texture--ashy sandy loam
Clay content--5 to 9 percent
Sand content--50 to 70 percent
Organic matter content--1 to 5 percent
Total rock fragment content--0 to 25 percent
Gravel content--0 to 25 percent
Cobble content--0 to 5 percent
Reaction--5.1 to 6.0
Thickness--13 to 25 cm

Bw horizon
Hue--10YR
Value--5 or 6 moist, 7 or 8 dry
Chroma--3 to 6 moist, 3 or 4 dry
Fine-earth texture--ashy very fine sandy loam, ashy silt loam
Clay content--4 to 8 percent
Sand content--40 to 54 percent
Organic matter content--0.5 to 2.5 percent
Total rock fragment content--0 to 10 percent
Gravel content--0 to 10 percent
Reaction--5.1 to 6.5
Thickness--13 to 35 cm

BC horizon
Hue--10YR
Value--4 to 6 moist, 6 to 8 dry
Chroma--2 to 4 moist
Fine-earth texture--ashy very fine sandy loam, ashy silt loam
Clay content--3 to 5 percent
Sand content--35 to 65 percent
Organic matter content--0.5 to 2.5 percent
Total rock fragment content--0 to 5 percent
Gravel content--0 to 4 percent
Reaction--5.1 to 6.5
Thickness--20 to 35 cm

2Ab horizon, or 2Eb horizon (where present)
Hue--10YR
Value--3 or 4 moist; 5 to 7 dry
Chroma--2 to 4 moist or dry
Fine-earth texture--loam, sandy loam
Clay content--5 to 8 percent
Sand content -50 to 70 percent
Organic matter content--2.5 to 4.0 percent
Total rock fragment content--0 to 25 percent
Gravel content--0 to 20 percent
Cobble content--0 to 5 percent
Reaction--5.1 to 6.5
Thickness--0 to 15 cm

2Eb horizon
Thickness--28 to 45 cm

2BCb horizon
Hue--10YR
Value--4 or 5 moist, 6 or 7 dry
Chroma--3 or 4 moist, 2 to 4 dry
Fine-earth texture--sandy loam
Clay content--4 to 10 percent
Sand content--50 to 70 percent
Organic matter content--0 to 2.0 percent
Total rock fragment content--0 to 30 percent
Gravel content--0 to 15 percent
Cobble content--0 to 10 percent
Stone content--0 to 5 percent
Reaction--5.1 to 6.5
Thickness--10 to 65 cm

2C horizon
Hue--10YR
Value--4 or 5 moist; 6 to 8 dry
Chroma--2 to 6 moist or dry
Fine-earth texture--loam, sandy loam, coarse sandy loam
Clay content--5 to 11 percent
Sand content--50 to 70 percent
Organic matter content--0 to 1.0 percent
Total rock fragment content--0 to 30 percent
Gravel content--0 to 15 percent
Cobble content--0 to 10 percent
Stone content--0 to 5 percent
Reaction--5.1 to 6.5

COMPETING SERIES: None

GEOGRAPHIC SETTING:
Lithology--granite, granodiorite
Elevation--1340 to 1870 m
Climate--cold, wet winters; cool, moist summers
Mean annual precipitation--700 to 950 mm
Mean annual air temperature--3 to 6 degrees C
Frost-free period--35 to 90 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Bulgar--on gentle, north-facing slopes of lateral moraines; ash mantle over till; more than 35 percent rock fragments in lower part of particle-size control section; udic soil moisture regime
Twocolor--on gentle, south-facing slopes of lateral moraines; xeric soil moisture regime
Inkler--on steeper slopes of adjacent lateral moraines; ash mantle 20 to 35 cm thick
Treble--on steeper slopes of adjacent lateral moraines; loamy-skeletal; 5 to 20 percent volcanic glass and 0.4 to 1.0 percent acid oxalate Al plus 1/2 Fe in upper 25 to 50 cm

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--timber production, watershed, wildlife habitat, recreation
Native vegetation--ponderosa pine, grand fir, Douglas-fir, lodgepole pine, western larch, pinegrass, heartleaf arnica, elk sedge, woodland strawberry, big huckleberry, white hawkweed, Sierra pea, common yarrow

DISTRIBUTION AND EXTENT: Blue Mountains of northeastern Oregon; MLRA 10; small extent

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Baker County, Oregon; 2012

REMARKS:
Diagnostic horizons and other features in this pedon
*Ochric epipedon
*Cambic horizon--zones from 15 to 61 cm and 66 to 109 cm
*Andic soil properties--zone from 15 to 61 cm
*Vitrandic feature--zone from 3 to 15 cm
*Volcanic glass--zone from 3 to 61 cm
*Depth to lithologic discontinuity--61 cm
*Particle-size control section--zones from 3 to 15 cm and 61 to 104 cm (loamy part); zone from 15 to 61 cm (ashy part)

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.

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National Cooperative Soil Survey
U.S.A.