LOCATION ARENASED OR
Tentative Series
DMK/TDT/KMS
12/2024
ARENASED SERIES
Landscape--mountains
Landform--mountain flanks, hillslopes, canyon walls
Slope--5 to 65 percent
Parent Material--volcanic ash over mixed colluvium and residuum derived from marine sediments
Mean annual precipitation--about 530 mm
Mean annual air temperature--about 7 degrees C
Depth class--moderately deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--frigid
Soil moisture subclass--typic
TAXONOMIC CLASS: Ashy over loamy, glassy over isotic, frigid Humic Vitrixerands
TYPICAL PEDON: Arenased ashy sandy loam - upland forest, on a 20 percent linear slope, north aspect, at an elevation of 1638 meters. (Colors are for dry soil unless otherwise noted.)
Oi--0 to 3 centimeters; slightly decomposed needles and twigs
A1--3 to 8 centimeters; brown (10YR 5/3) ashy sandy loam, dark brown (10YR 3/3) moist; weak very fine granular structure; loose, loose, non-sticky and non-plastic; many very fine and fine roots; many very fine and fine interstitial pores; 10 percent gravel, neutral (pH 6.6); clear wavy boundary.
A2--8 to 38 centimeters; brown (10YR 4/3) ashy sandy loam, dark brown (10YR 3/3) moist; moderate very fine and fine subangular blocky structure; moderately hard, friable, non-sticky and non-plastic; common very fine and fine roots; common very fine dendritic tubular pores; 10 percent gravel, neutral (pH 7.0); clear wavey boundary. (15 to 25 inches thick)
2Bt1--38 to 51 centimeters; brown (10YR 4/3) very fine sandy loam, dark brown (10YR 3/3) moist; moderate fine subangular blocky structure; moderately hard, friable, non-sticky and non-plastic; few fine and coarse roots; common medium dendritic tubular pores; very few faint clay films bridging sand grains; 10 percent gravel; slightly acid (pH 6.4); clear wavey boundary.
2Bt2--51 to 64 centimeters; brown (10YR 5/3) very fine sandy loam; brown (10YR 4/3) moist; moderate fine subangular blocky structure, moderately hard, friable, slightly sticky, and non-plastic; common medium and coarse roots; few very fine dendritic tubular pores; very few faint clay films bridging sand grains; 10 percent gravel; neutral (pH 6.8); clear wavey boundary. (5 to 10 inches thick)
3Crt--64 to 66 centimeters; weathered conglomerate.
3R--66 centimeters; fractured conglomerate.
TYPE LOCATION: Grant County, Oregon. Located about 433 meters north and 100 meters east from the SW corner of section 10, T.18 S., R. 26 E.; Latitude 44.0203896, Longitude -119.5964203, WGS84 Datum (coordinates determined from a GPS)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--5 to 7 degrees C
Soil moisture--dry 60 to 90 consecutive days in summer and early fall
Depth to paralithic contact--50 to 95 centimeters
Depth to lithic contact--50 to 100 centimeters
Thickness of mollic epipedon--35 to 60 centimeters
Thickness of surface ash influenced layers--36 to 60 centimeters
Estimated properties of layers influenced by volcanic ash
*Al+1/2Fe (ammonium oxalate)--0.4 to 0.8 percent
*P retention--25 to 50 percent
*Volcanic glass content in the 0.02 to 2.0 mm fraction--30 to 50 percent
*Water content at 1500 kPa tension (air dried)--7 to 12 percent
Particle-size control section (upper part, ashy)
*Clay content (weighted average)--10 to 18 percent
*Total fragment content (weighted average)--5 to 15 percent
Particle-size control section (lower part, loam)
*Clay content (weighted average)--12 to 20 percent
*Total fragment content (weighted average)--5 to 35 percent
A horizons
*Hue--10YR
*Value--4 or 5 dry, 3 moist
*Chroma--3 dry or moist
*Fine earth texture--ashy fine sandy loam, ash sandy loam
*Clay content--10 to 18 percent
*Sand content--45 to 75 percent
*Organic matter content--2 to 4 percent
*Total fragments--5 to 15 percent
*Gravel content--5 to 15 percent
*Cobble content--0 to 5 percent
*Stone content--0 to 5 percent
*Reaction--slightly acid to neutral
2Bt horizons
*Hue--10YR
*Value--4 or 5 dry, 3 or 4 moist
*Chroma--3 dry or moist
*Fine earth texture--sandy loam, fine sandy loam
*Clay content--12 to 20 percent
*Sand content--45 to 75 percent
*Organic matter content--0.5 to 2 percent
*Total fragments--5 to 35 percent
*Gravel--0 to 30 percent
*Cobbles--0 to 5 percent
*Stones--0 to 2 percent
*Reaction--slightly acid to neutral
COMPETING SERIES:
Havillah--50 to 100 centimeters to densic contact (glacial till)
Koepke--100 to 150 centimeters to densic contact (glacial till)
GEOGRAPHIC SETTING:
Elevation--1150 to 1830 meters
Climate--cool, wet winters and warm, dry summers
Mean annual precipitation--460 to 560 mm
Mean annual air temperature--5 to 7 degrees C
Frost-free period--50 to 90 days
Lithology--mesozoic sediments composed of marine shale, sandstone, limestone, argillite, or conglomerate
GEOGRAPHICALLY ASSOCIATED SOILS:
Bluebucket--occur on north facing mountain slopes; average less than 35 percent coarse fragments in the control section; greater than 100 centimeters to lithic contact
Keerins--occurs on adjacent hillslopes; less than 50 centimeters to lithic contact; averages greater than 35 percent coarse fragments in the control section; lacks organic surface horizon
Logdell--occurs on adjacent mountain slopes and hillslopes; less than 25 centimeters to lithic contact
Utley--occurs on toeslopes and drainageways; greater than 100 centimeters to lithic contact
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturation during normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)-high throughout
USE AND VEGETATION:
Use--timber production, wildlife habitat, livestock grazing
Potential native vegetation--ponderosa pine, mountain mahogany, pinegrass, Idaho fescue, bluebunch wheatgrass
DISTRIBUTION AND EXTENT:
Distribution--Blue and Ochoco Mountains of central Oregon
Extent--MLRA43C; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: BOZEMAN, MONTANA
SERIES PROPOSED: Grant County, Oregon, 2008
REMARKS:
Diagnostic horizons and features recognized in this pedon are;
*Andic soil properties--3 to 38 centimeters
*Mollic epipedon--3 to 38 centimeters
The Plant association at the type location is: CPG221, Ponderosa pine; pinegrass (Johnson and Clausnitzer, 1992, Plant Associations of the Blue and Ochoco Mountains);
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National Cooperative Soil Survey
U.S.A.