LOCATION EDGEWOOD OR
Tentative Series
Rev. DBM/JFD/TDT/CEG
02/2025
EDGEWOOD SERIES
Landscape--mountains
Landform--dip slopes and scarp slopes of stratovolcanoes
Slope--2 to 50 percent
Parent material--sandy colluvium derived from volcanic rock and/or from coarse pumiceous volcanic ash and pumice parafragments over loamy colluvium derived from volcanic rock and/or tephra
Mean annual precipitation--about 813 mm
Mean annual air temperature--about 4.1 degrees C
Depth class--very deep
Drainage class--somewhat excessively drained
Soil moisture regime--udic
Soil temperature regime--frigid
Soil moisture subclass--typic
TAXONOMIC CLASS: Ashy-skeletal over loamy-skeletal, amorphic over isotic, frigid Humic Udivitrands
TYPICAL PEDON: Edgewood gravelly ashy loamy coarse sand on a forested scarpslope, under a white fir/snowbrush ceanothus-prostrate ceanothus/Virginia strawberry plant association, with a slope of 30 percent and a west aspect at 1685.5 m elevation; surface stones and boulders cover 2 percent of the surface
Oi--0 to 3 cm; slightly decomposed plant material; forest litter of needles, twigs, cones and leaves; abrupt smooth boundary
Oe--3 to 4 cm; moderately decomposed plant material; forest litter of needles, twigs, cones and leaves; abrupt smooth boundary
A1--4 to 19 cm; gravelly ashy loamy coarse sand, dark brown (10YR 3/3) dry, very dark grayish brown (10YR 3/2) moist; weak coarse granular structure; loose, nonsticky, nonplastic; few fine and coarse, common medium and many very fine roots; many very fine interstitial pores; 20 percent indurated volcanic rock gravel, 5 percent indurated volcanic rock cobbles, 2 percent indurated volcanic rock stones, 1 percent indurated volcanic rock boulders and 2 percent moderately cemented pumice paragravel; slightly acid (pH 6.4); clear wavy boundary
A2--19 to 47 cm; cobbly ashy coarse sandy loam, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; weak medium subangular blocky structure; soft, very friable, nonsticky, nonplastic; common fine and medium, few coarse and many very fine roots; many fine and very fine irregular pores; 15 percent indurated volcanic rock gravel, 10 percent indurated volcanic rock cobbles, 5 percent indurated volcanic rock stones, 1 percent indurated volcanic rock boulders and 2 percent moderately cemented pumice paragravel; slightly acid (pH 6.4); gradual smooth boundary
Bw1--47 to 98 cm; extremely stony ashy loamy coarse sand, brown (7.5YR 5/4) dry, brown (7.5YR 4/3) moist; single grain; loose, nonsticky, nonplastic; common fine and coarse, many very fine and medium, and few very coarse roots; many very fine interstitial pores; 20 percent indurated volcanic rock gravel, 30 percent indurated volcanic rock cobbles, 25 percent indurated volcanic rock stones and 1 percent moderately cemented pumice paragravel and ; slightly acid (pH 6.2); clear wavy boundary
2Bw2--98 to 155 cm; very cobbly ashy sandy loam, brown (10YR 5/3) dry, dark grayish brown (10YR 4/2) moist; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; few fine, medium and coarse and many very fine roots; many very fine irregular pores; 15 percent indurated volcanic rock gravel, 20 percent indurated volcanic rock cobbles and 2 percent indurated volcanic rock stones; slightly acid (pH 6.2)
TYPE LOCATION: Klamath County, Oregon; about 12 miles north and 3 miles east of Klamath Falls; 800 feet east and 100 feet south of the northwest corner of section 35, T. 36 S., R. 8 E., Willamette Meridian; Swan Lake Point, Oregon USGS quadrangle. Latitude 42.4142838 degrees north, longitude 121.7386017 degrees west, datum WGS84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
*Soil Temperature--frigid regime
*Mean annual soil temperature-- 2.5 to 7.8 degrees C
*Mean summer soil temperature-- 5.3 to 10.6 degrees C
*Mean winter soil temperature-- -1.4 to 3.9 degrees C
*Moisture control section--20 to 60 cm; not dry in any part for as long as 90 days in normal years; dry in all parts for 30 to 45 consecutive days in August, September or October
*Rock fragments--pumice paragravel in the upper part of the profile; hard lava or andesite gravel, cobbles and stones
*Umbric epipedon--25 to 50 cm thick
*Lithologic discontinuity, depth below mineral soil surface--36 to 95 cm
Particle-size control section
*Rock fragment content, upper part--35 to 70 percent
*Rock fragment content, lower part--35 to 80 percent
*Pararock fragment content, upper part--0 to 10 percent
*Pararock fragment content, lower part--0 to 15 percent
Estimated properties, upper part of the profile
*Ammonium oxalate extractable Al plus 1/2 Fe--0.4 to 2.0 percent
*.02- to 2.0-mm fraction--60 to 90 percent
*medium to very coarse sand in the .02 to 2.0 mm fraction--greater than 50 percent
*P retention--25 to 50
*Volcanic glass content--15 to 100 percent
*Moist bulk density--0.7 to 1.0 g/cm3
*1/3-bar bulk density--0.75 to 0.9 g/cm3
*1500 kPa water (air-dried samples)--3 to 12 percent
Estimated properties, lower part of the profile
*Ammonium oxalate extractable Al plus 1/2 Fe--0.2 to 0.4 percent
*P retention--10 to 25
*Volcanic glass content--30 to 70 percent
A horizons
*Hue--7.5YR or 10YR
*Value--2 to 3 moist, 3 to 5 dry; some coarse and very coarse sand grains are 4 moist, 6 dry
*Chroma--2 or 3 moist or dry; some coarse and very coarse sand grains are 4 to 6 moist
*Fine-earth texture--ashy coarse sandy loam, ashy loamy coarse sand
*Clay content--1 to 25 percent
*Total content of rock and pararock fragments--15 to 80 percent
*Paragravel content--0 to 5 percent
*Gravel content--0 to 35 percent
*Cobble content--0 to 40 percent
*Stone content--0 to 40 percent
*Boulder content--0 to 25 percent
*Reaction--strongly acid to slightly acid (pH 5.1 to 6.5)
*Thickness--25 to 48 cm
Bw horizon or C horizon (where present)
*Hue--7.5YR or 10YR
*Value--3 or 4 moist, 4 to 6 dry
*Chroma--3 or 4 moist or dry; some coarse and very coarse sand grains are 5 or 6 moist
*Fine-earth texture--ashy coarse sandy loam, ashy loamy sand, ashy loamy coarse sand
*Clay content--1 to 15
*Total content of rock and pararock fragments--15 to 80 percent
*Paragravel content--0 to 5 percent
*Gravel content--5 to 40 percent
*Cobble content--5 to 45 percent
*Stone content--0 to 40 percent
*Boulder content--0 to 25 percent
*Reaction: slightly acid or neutral (pH 6.1 to 7.3)
*Thickness--13 to 70 cm
2Bw horizon
*Hue--5YR to 10YR
*Value--3 to 5 moist, 4 or 5 dry
*Chroma--2 to 4 moist or dry
*Fine-earth texture--ashy loam, ashy sandy loam
*Clay content--1 to 25
*Total content of rock and pararock fragments--35 to 80 percent
*Paragravel content--0 to 15 percent
*Gravel content--10 to 55 percent
*Cobble content--5 to 40 percent
*Stone content--0 to 40 percent
*Boulder content--0 to 60 percent
*Reaction: slightly acid or neutral (pH 6.1 to 7.3)
COMPETING SERIES: None
GEOGRAPHIC SETTING:
Elevation--1300 to 2210 m
Climate--cold moist winters and cool dry summers
Mean annual air temperature--1.4 to 6.7 degrees C
Mean annual precipitation--455 to 1120 mm
Frost-free period--50 to 90 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Ryespur--plateaus and glacial outwash plains; argillic horizon; xeric soil moisture regime; lack andic soil properties
Yawhee--dip slopes on stratovolcanoes; argillic horizon in the lower part of the profile
Swantower--scarp slopes and dip slopes on stratovolcanoes; cryic temperature regime
Swansprings--scarp slopes and dip slopes on stratovolcanoes; argillic horizon in lower part of profile; cryic temperature regime
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--somewhat excessively drained
Saturated hydraulic conductivity (Ksat)--high to very high in the upper part and moderately high to high in the lower part
USE AND VEGETATION:
Use--timber production, wildlife habitat, livestock grazing, recreation
Vegetation--ponderosa pine, white fir, Douglas-fir, sugar pine, incense cedar, greenleaf manzanita, creeping snowberry, snowbrush ceanothus, prostrate ceanothus, long-stolon sedge
DISTRIBUTION AND EXTENT: Olympic and Cascade Mountains, Oregon; MLRA 3; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana
SERIES PROPOSED:
Winema National Forest, Klamath County, Oregon, 2008
REMARKS:
Diagnostic horizons and features in this pedon
*Umbric epipedon--zone from 4 to 47 cm
*Cambic horizon--zone from 98 to 155 cm
*Andic soil properties--zone from 47 to 98 cm
*Volcanic glass--zone from 4 to 155 cm
*Depth to lithologic discontinuity--98 cm
*Particle-size control section--4 to 104 cm
*Laboratory data--Supplementary analysis on another pedon identified as Edgewood, sample number S95OR-035-004. No "sampled as" name.
5/2020--Updated mineralogy and particle size class in taxonomic classfication, epipedon type, surface textural modifier, andic soil properties, competing series, geographically associated soils, and information on laboratory data.
ADDITIONAL DATA:
NASIS SITE ID--05-JFD-12; NASIS PEDON ID--05OR683012
NSSL analysis on the 4 to 19, 19 to 47, 47 to 98 and 98 to 155 cm depth zones (A1, A2, Bw1 and 2Bw2 horizons respectively), sample number S08OR-035-003.
National Cooperative Soil Survey
U.S.A.