LOCATION SKYLAKE OR
Tentative Series
IRD. JFD/CEG/BTH
02/2025
SKYLAKE SERIES
Landscape--Cascade mountains
Landform--moraines, mountain valleys
Slope--0 to 12 percent
Parent material--colluvium and mudflows mixed with volcanic ash over alluvium
Mean annual precipitation--about 1200 mm
Mean annual air temperature--about 5.4 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--frigid
Soil moisture subclass--typic
TAXONOMIC CLASS: Medial over loamy, amorphic over isotic, frigid Alfic Hapludands
TYPICAL PEDON: Skylake cobbly medial sandy loam on a forested moraine on a mountain valley with a slope of 4 percent and an elevation of 1661 m
Oi--0 to 1 cm; slightly decomposed needles and twigs; abrupt smooth boundary
Oe--1 to 3 cm; moderately decomposed needles and twigs; abrupt smooth boundary
Oa--3 to 5 cm; strongly decomposed needles and twigs; abrupt smooth boundary
A--5 to 15 cm; gravelly medial sandy loam, brown (7.5YR 4/4) dry, dark reddish brown (2.5YR 3/3) moist; moderate fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine to medium and few coarse and very coarse roots; many very fine irregular pores; 5 percent paragravel, 10 percent gravel, 5 percent cobbles; neutral (pH 6.6); clear wavy boundary
Bw1--15 to 45 cm; gravelly medial loam, brown (7.5YR 4/4) dry, dark reddish brown (5YR 3/4) moist; weak very coarse subangular blocky parting to moderate fine granular structure; soft, very friable, nonsticky and slightly plastic; many very fine to medium, common coarse, and few very coarse roots; many very fine irregular pores; 10 percent paragravel, 10 percent gravel, 5 percent cobbles; moderately acid (pH 5.8); abrupt wavy boundary
2Bw2--45 to 55 cm; paragravelly loam, brown (7.5YR 5/4) dry, reddish brown (5YR 4/3) moist; moderate very coarse subangular blocky structure; moderately hard, very friable, slightly sticky and moderately plastic; common very fine and few fine and medium roots; many very fine dendritic tubular pores; 7 percent paragravel, 8 percent gravel, 5 percent cobbles; moderately acid (pH 5.8); clear wavy boundary
2Bt1--55 to 75 cm; paragravelly clay loam, brown (7.5YR 4/4) dry, dark brown (7.5YR 3/4) moist; moderate very coarse subangular blocky structure; hard, friable, moderately sticky and very plastic; common very fine and few fine and medium roots; many very fine and few fine dendritic tubular pores; 7 percent paragravel, 8 percent gravel, 5 percent cobbles; moderately acid (pH 5.8); clear wavy boundary
2Bt2--75 to 120 cm; paragravelly loam, brown (7.5YR 4/4) dry, dark brown (7.5YR 3/4) moist; moderate very coarse subangular blocky structure; hard, friable, slightly sticky and very plastic; few very fine to medium roots; many very fine and common fine dendritic tubular pores; 10 percent paragravel and 10 percent gravel; moderately acid (pH 5.6); diffuse wavy boundary
2BC--120 to 200 cm; paragravelly loam, strong brown (7.5YR 4/6) dry, brown (7.5YR 4/3) moist; moderate very coarse subangular blocky structure; moderately hard, friable, slightly sticky and very plastic; few very fine to medium roots; many very fine and common fine dendritic tubular pores; 10 percent paragravel and 10 percent gravel; moderately acid (pH 5.6)
TYPE LOCATION: Klamath County, Oregon; sec. 5, T. 38 S., R. 5 E., Willamette Meridian; Brown Mountain, Oregon USGS quadrangle; latitude 42.3002341 degrees north, longitude 122.2630317 degrees west, datum WGS84 (coordinates estimated from GPS)
RANGE IN CHARACTERISTICS:
*Soil temperature regime--frigid
*Mean annual soil temperature-- 5.0 to 8.0 degrees C
*Moisture control section--10 to 30 cm; dry for 30 to 45 consecutive days
*Rock fragments--strongly coherent to indurated andesite or basalt
*Pararock fragments--weakly to moderately coherent andesite
Particle-size control section
*Rock fragment content--12 to 32 percent
*Clay content--8 to 30 percent
Estimated properties, A and Bw horizons (upper part of the particle-size control section)
*Thickness--greater than 36 cm
*Ammonium oxalate extractable Al plus 1/2 Fe--2.0 to 3.0 percent
*P retention--85 to 95 percent
*1/3-bar bulk density--0.75 to 0.9 g/cm3
*1500 kPa water (air-dried samples)--15 to 25 percent
Oi, Oe, and/or Oi horizons
Thickness--1 to 10 cm, combined
A horizon
Hue--7.5YR or 10YR dry, 5YR or 7.5YR moist
Value--3 to 6 dry, 3 or 4 moist
Chroma--3 to 6 dry, 2 to 4 moist
Fine-earth texture--medial loam, medial sandy loam
Clay content--5 to 20 percent
Total content of rock and pararock fragments--15 to 30 percent
Paragravel content--0 to 10 percent
Gravel content--10 to 20 percent
Cobble content--0 to 5 percent
Reaction--moderately acid to neutral (pH 5.6 to 7.3)
Thickness--5 to 30 cm
Bw horizons
Hue--5YR to 10YR dry or moist
Value--3 to 6 dry, 3 or 4 moist
Chroma--3 to 6 dry, 3 or 4 moist
Fine-earth texture--medial loam or medial sandy loam
Clay content--5 to 25 percent
Total content of rock and pararock fragments--15 to 34 percent
Paragravel content--0 to 10 percent
Gravel content--10 to 20 percent
Cobble content--0 to 5 percent
Reaction--moderately acid to neutral (pH 5.6 to 7.3)
Thickness--25 to 70 cm
2Bw horizons (where present)
Hue--7.5YR or 10YR dry, 5YR to 10YR moist
Value--3 to 6 dry, 3 to 5 moist
Chroma--3 to 6 dry, 3 or 4 dry
Fine-earth texture--loam, sandy loam
Clay content--5 to 25 percent
Total content of rock and pararock fragments--10 to 35 percent
Paragravel content--5 to 15 percent
Gravel content--5 to 15 percent
Cobble content--0 to 5 percent
Reaction--moderately acid to slightly acid (pH 5.6 to 6.5)
Thickness--0 to 40 cm
2Bt horizons
Hue--7.5YR or 10YR dry or moist
Value--4 to 6 dry, 3 to 5 moist
Chroma--3 to 6 dry, 3 to 6 moist
Fine-earth texture--sandy loam, loam, clay loam
Clay content--10 to 35 percent
Total content of rock and pararock fragments--10 to 30 percent
Paragravel content--5 to 10 percent
Gravel content--5 to 15 percent
Cobble content--0 to 5 percent
Reaction--moderately acid to slightly acid (pH 5.6 to 6.5)
Thickness--40 to 80 cm
2BC horizon
Hue--7.5YR or 10YR dry, 5YR to 10YR moist
Value--4 to 6 dry, 4 or 5 moist
Chroma--4 to 6 dry, 3 to 6 moist
Fine-earth texture--sandy loam, loam, clay loam
Clay content--10 to 25 percent
Total content of rock and pararock fragments--10 to 30 percent
Paragravel content--5 to 10 percent
Gravel content--5 to 15 percent
Cobble content--0 to 5 percent
Reaction--moderately acid to slightly acid (pH 5.6 to 6.5)
COMPETING SERIES:
There are no competing series.
GEOGRAPHIC SETTING:
Elevation--1265 to 1900 m
Climate--humid, wet winters and springs
Mean annual air temperature-- 3.9 to 7.0 degrees C
Mean annual precipitation--600 to 1500 mm
Frost-free period--40 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Aspenbutte--medial-skeletal over loamy-skeletal particle-size class
Grousehill--medial-skeletal particle-size class; duripan 50 to 100 cm from soil surface; oxyaquic conditions above duripan; cryic
Kyotesue--medial-skeletal particle-size class; no lithologic discontinuity
Nutmeg--medial particle size class; aquic conditions 50 to 100 cm from soil surface; cryic
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--moderately high to high
USE AND VEGETATION:
Use--timber production, wildlife habitat, recreation
Vegetation--white fir, Douglas-fir, ponderosa pine, incense cedar, sugar pine, mountain brome, western prince's pine, sedge
DISTRIBUTION AND EXTENT: Cascade Mountains in southern Oregon; MLRA 3; moderate extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED:
Klamath County, Oregon, 2010
REMARKS:
Diagnostic horizons and features in this pedon
*Particle-size control section--zone from 5 to 105 cm
*Ochric epipedon
*Andic soil properties--zone from 5 to 45 cm
*Cambic horizon--zone from 15 to 55 cm
*Argillic horizon--zone from 55 to 120 cm
*Lithologic discontinuity--upper boundary at 45 cm
ADDITIONAL DATA:
NASIS SITE ID--06-JFD-135; NASIS PEDON ID--06OR683011
*Complete Kellogg Soil Survey Laboratory (KSSL) characterization--lab pedon ID 11N0412
National Cooperative Soil Survey
U.S.A.