LOCATION CELLROCK                OR

Tentative Series
JRD/DAL/TDT
12/2024

CELLROCK SERIES

Landscape--plateaus, mountains
Landform--hillslopes, summits, plateaus
Slope--10 to 60 percent
Parent material--colluvium and residuum derived from Mesozoic sedimentary siltstones and mudstones
Mean annual precipitation--about 610 mm
Mean annual air temperature--about 5 degrees C
Depth class--moderately deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--frigid
Soil moisture subclass--typic

TAXONOMIC CLASS: Clayey-skeletal, smectitic, frigid Ultic Argixerolls

TYPICAL PEDON: Cellrock very stony ashy sandy loam on a 25 percent west facing slope at an elevation of 1,770 m in rangeland. (Colors are for dry soil unless otherwise noted).

Oi--0 to 5 cm; mahogany leaf litter

A1--5 to 10 cm; dark brown (10YR 3/3) very stony ashy loam, very dark grayish brown (10YR 3/2) moist; strong thin and medium platy structure; soft, very friable; non-sticky and non-plastic; many very fine and fine roots; many very fine and fine vesicular pores; 10 percent gravels, 10 percent cobbles and 20 percent stones; slightly acid (pH 6.2); abrupt smooth boundary.

A2--10 to 18 cm; dark brown (10YR 3/3) very stony ashy sandy loam, dark grayish brown (10YR 3/2) moist; moderate medium platy structure; soft, friable, slightly sticky and slightly plastic; many very fine and fine roots, common medium roots; common very fine vesicular and tubular pores; 10 percent gravels, 10 percent cobbles and 20 percent stones; slightly acid (pH 6.2); abrupt wavy boundary. (The combined thickness of the A1 and A2 horizons is 4 to 6 inches)

2AB--18 to 33 cm; brown (10YR 4/3) very stony sandy clay loam, very dark grayish brown (10YR 3/2) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; many very fine, fine, medium and coarse roots; common very fine and fine tubular pores; about 10 percent gravels, 20 percent cobbles and 20 percent stones; slightly acid (pH 6.2); abrupt wavy boundary. (0 to 6 inches thick)

2Bt1--33 to 56 cm; yellowish brown (10YR 5/4) extremely stony sandy clay, dark brown (10YR 3/3) moist; strong medium subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common fine, medium and coarse roots; few very fine and fine tubular pores; 10 percent gravels, 20 percent cobbles and 30 percent stones; common faint clay films on ped faces and on rock faces; moderately acid (pH 6.0); abrupt wavy boundary. (8 to 12 inches thick)

2Bt2--56 to 91 cm; yellowish brown (10YR 5/4) extremely stony sandy clay, dark yellowish brown (10YR 4/4) moist, strong medium subangular blocky structure; hard, friable, very sticky and very plastic; few fine, medium and coarse roots; few very fine tubular pores; 10 percent gravels, 20 percent cobbles and 30 percent stones; many distinct thick clay films on ped faces and rock faces; moderately acid (pH 6.0) abrupt wavy boundary. (10 to 18 inches thick).

3Cr--91 to 109 cm; weathered Mesozoic sedimentary rock

3R--109 cm; indurated Mesozoic sedimentary bedrock.

TYPE LOCATION: Grant County, on the 4385 road west of Snow Mountain. SE1/4, NW1/4 of section 30, T. 18 S., R. 27 E.; latitude 43.9831992, longitude -119.5315499, WGS84 Datum (coordinates determined with a GPS)

RANGE IN CHARACTERISTICS:
Mean Annual Soil Temperature--4 to 8 degrees C
Soil Moisture--usually moist but are dry for 60 to 75 days following the summer solstice
Depth to paralithic contact--50 to 90 cm
Depth to lithic contact--125 to 150 cm
Mollic epipedon--25 to 50 cm thick
Base saturation above 76 cm--50 to 75 percent

Estimated properties of layers influenced with volcanic ash
*Volcanic ash thickness--10 to 15 cm
*Acid oxalate extractable Al+1/2Fe--0.4 to 1.0 percent
*Volcanic glass content--5 to 20 percent

Particle size control section
*Clay content--35 to 55 percent
*Total rock fragment content--35 to 85 percent

A horizons
*Hue--10YR moist or dry
*Value--3 or 4 moist, 4 or 5 dry
*Chroma--2 or 3, dry or moist
*Fine earth texture--sandy loam, loam
*Clay content--10 to 25 percent
*Sand content--35 to 65 percent
*Organic matter content--2 to 6 percent
*Total rock fragment content--15 to 55 percent
*Gravel content--5 to 20 percent
*Cobble content--5 to 30 percent
*Stone content--5 to 30 percent
*Reaction--slightly acid
*Thickness--10 to 15 cm

2AB horizon
*Hue--10YR moist or dry
*Value--3 or 4 moist, 4 or 5 dry
*Chroma--2 or 3, dry or moist
*Fine earth texture--sandy clay loam, clay loam
*Clay content--20 to 35 percent
*Sand content--30 to 65 percent
*Organic matter content--1 to 3 percent
*Total rock fragment content--15 to 55 percent
*Gravel content--5 to 20 percent
*Cobble content--5 to 30 percent
*Stone content--5 to 30 percent
*Reaction--slightly acid
*Thickness--0 to 15 cm

2Bt horizons
*Hue--10YR or 7.5 YR
*Value--3 to 5 dry, 3 or 4 moist
*Chroma--3 or 4, dry or moist
*Fine earth texture--sandy clay, clay
*Clay content--35 to 55 percent
*Sand content--30 to 60 percent
*Organic matter content--0.5 to 1.5 percent
*Total rock fragment content--35 to 85 percent
*Gravel content--5 to 25 percent
*Cobble content--15 to 40 percent
*Stone content--15 to 40 percent
*Reaction--moderately acid or slightly acid
*Thickness--25 to 75 cm

COMPETING SERIES:
Cavanaugh--50 to 100 cm to lithic contact; lacks influence of ash
Elksel--100 to 150 cm to lithic contact
Howcree--greater than 150 cm to restrictive feature; contain silica cementation above 100 cm
Stash--greater than 150 cm to restrictive feature

GEOGRAPHIC SETTING:
Elevation--1220 to 1980 m
Climate--cold, moist winters and warm, dry summers
Mean annual precipitation--500 to 660 mm
Mean annual air temperature--4 to 7 degrees C
Frost-free period--60 to 90 days
Lithology--mixed sedimentary rocks of the Baker and Oldsferry Terranes with an influence on mixed volcanic ash in the surface

GEOGRAPHICALLY ASSOCIATED SOILS:
Burntcabin--occur on hillslopes, mountainslopes; greater than 150 cm to restrictive feature; 18 to 36 cm of volcanic ash
Dobsonspring--occurs on hillslopes, mountainslopes; 100 to 150 cm to paralithic contact
Laycock--occurs on hillslopes, ridges; 25 to 50 cm to lithic contact
Volspring--occur on mountainslopes, benches; greater than 150cm to restrictive feature; greater than 36 cm of andic soil properties in surface

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage--Well drained
Saturation during normal years--none
Flooding--none
Ponding--none
Saturated hydraulic conductivity (Ksat)--moderately low

USE AND VEGETATION:
Use--livestock grazing, wildlife habitat
Potential native vegetation--scattered ponderosa pine and western juniper,

DISTRIBUTION AND EXTENT: Central Oregon; Southwestern Blue Mountains, MLRA 10, this series is of small extent.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana

SERIES PROPOSED: Grant County, Oregon, 2005.

REMARKS:
Diagnostic horizons and features recognized in this series are
Mollic epipedon--the zone from the mineral surface of the soil to 33 cm (A1, A2, and 2AB horizons).
Argillic horizon--the zone from approximately 33 to 91 cm (2Bt1 and 2Bt2 horizons)
Particle-size Control Section - upper 50 cm of argillic horizon

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National Cooperative Soil Survey
U.S.A.