LOCATION CLEYMOR ID
Established Series
Rev. DJT/ALH/CLM
01/2011
CLEYMOR SERIES
The Cleymor series consists of very deep, well drained soils with very slow permeability that formed in colluvium and slope alluvium from fine pyroclastic materials and basalt. Slopes range from 4 to 35 percent in foothills. The average annual precipitation is about 26 inches and the average annual temperature is about 44 degrees F.
TAXONOMIC CLASS: Fine, smectitic, frigid Vertic Argixerolls
TYPICAL PEDON: Cleymor silt loam, forested -- on a west-facing slope of 35 percent at 4,980 feet elevation. When described on October 4, 1994, the soil was dry throughout. (Colors are for air-dry soil unless otherwise noted.)
Oi--0 to 1 inch; slightly decomposed forest litter.
A--1 to 4 inches; very dark gray (10YR 3/1) silt loam, very dark brown (10YR 2/2) moist; moderate very thin platy structure parting to weak fine granular; soft, very friable, moderately sticky and moderately plastic; many very fine and fine and few medium and coarse roots; many very fine, fine and medium irregular pores; moderately acid (pH 6.0); clear smooth boundary. (1 to 5 inches thick)
ABt--4 to 7 inches; very dark gray (10YR 3/1) silty clay loam, very dark brown (10YR 2/2) moist; weak fine and medium subangular blocky structure parting to moderate very fine subangular blocky; hard, friable, moderately sticky and moderately plastic; many very fine and fine, few medium and coarse roots; many very fine, fine and medium irregular and tubular pores; common faint clay films on faces of peds; moderately acid (pH 5.9); clear smooth boundary. (0 to 5 inches thick)
Bt1--7 to 11 inches; very dark grayish brown (10YR 3/2) silty clay loam, very dark brown (10YR 2/2) moist; strong fine subangular blocky structure; very hard, firm, very sticky and very plastic; many very fine and fine, few medium and coarse roots; many very fine, fine and medium tubular pores; many distinct clay films on faces of peds; about 25 percent of ped surface covered with siltans; cracks 1 to 5 cm wide; moderately acid (pH 5.9); abrupt smooth boundary. (0 to 5 inches thick)
Bt2--11 to 18 inches; very dark grayish brown (10YR 3/2) silty clay loam, very dark brown (10YR 2/2) moist; moderate very coarse prismatic structure; very hard, firm, moderately sticky and moderately plastic; common very fine and fine, few medium and coarse roots; many very fine, fine and medium tubular pores; many distinct clay films on faces of peds; cracks 1 to 5 cm wide; moderately acid (pH 5.8); gradual smooth boundary. (5 to 10 inches thick)
Btss1--18 to 31 inches; dark gray (10YR 4/1) silty clay, very dark gray (10YR 3/1) moist; strong very coarse prismatic structure; extremely hard, very firm, very sticky and very plastic; common very fine and fine, few medium and coarse roots; common very fine and fine tubular and irregular pores; many prominent clay films on faces of peds; about 25 percent of ped surface covered with siltans; common distinct intersecting slickensides; cracks 1 to 5 cm wide; slightly acid (pH 6.1); gradual wavy boundary. (10 to 15 inches thick)
Btss2--31 to 37 inches; very dark grayish brown (10YR 3/2) silty clay, very dark brown (10YR 2/2) moist; moderate medium prismatic structure; extremely hard, very firm, very sticky and very plastic; few very fine, fine, medium and coarse roots; common very fine and fine tubular and irregular pores; many prominent clay films on faces of peds; common distinct intersecting slickensides; 1 percent gravel; cracks 1 to 5 cm wide; moderately acid (pH 5.8); gradual wavy boundary. (0 to 5 inches thick)
Bt3--37 to 45 inches; brown (10YR 4/3) cobbly silty clay, dark brown (10YR 3/3) moist; weak coarse subangular blocky structure; extremely hard, very firm, very sticky and very plastic; few very fine, fine, medium and coarse roots; common very fine and fine tubular and irregular pores; many prominent clay films on faces of peds; 25 percent cobbles and 5 percent gravel; cracks 1 to 5 cm wide; moderately acid (pH 5.9); gradual wavy boundary. (5 to 10 inches thick)
Bt4--45 to 60 inches; brown (10YR 4/3) silty clay, dark brown (10YR 3/3) moist; weak coarse subangular blocky structure; extremely hard, very firm, very sticky and very plastic; few very fine, fine, medium and coarse roots; common very fine and fine tubular and irregular pores; many prominent clay films on faces of peds; 5 percent gravel; cracks 1 to 5 cm wide; moderately acid (pH 6.0).
TYPE LOCATION: Boise County, Idaho; about 2 miles south and 2 miles east of Banks; 2,000 feet north and 1,850 feet west of the southeast corner of section 10, T.8 N., R.3 E.; USGS Banks Quadrangle; Latitude - 44 degrees, 02 minutes, 35 seconds N. and Longitude - 116 degrees, 05 minutes, 07 seconds W.; NAD 83.
RANGE IN CHARACTERISTICS:
Mollic epipedon thickness - 20 to 60 inches or more
Depth to bedrock - greater than 60 inches
Reaction - slightly acid or moderately acid
Particle-size control section - 35 to 50 percent clay; 0 to 15 percent rock fragments
Moisture control section - dry 45 to 75 days consecutive following the summer solstice
Average annual soil temperature - 44 to 47 degrees F.
A horizon
Value - 3 or 4 dry, 2 or 3 moist
Chroma - 1 or 2 dry or moist
Clay content - 20 to 27 percent
ABt horizon (when present)
Value - 3 or 4 dry, 2 or 3 moist
Chroma - 1 through 3 dry or moist
Texture - SICL or SIL
Clay content - 23 to 30 percent
Bt1, Bt2, and Btss horizons
Value - 3 or 4 dry, 2 or 3 moist
Chroma - 1 through 3 dry or moist
Texture - SICL or SIC
Clay content - 35 to 50 percent
Rock fragments - 0 to 15 percent gravel
Cracks - 1 to 5 cm wide when dry
Bt3 and Bt4 horizons
Value - 3 or 4 dry, 2 or 3 moist
Chroma - 1 through 3 dry or moist
Texture - SIC
Clay content - 40 to 50 percent
Rock fragments - 0 to 30 percent cobbles, 0 to 15 percent gravel and 5 to 35 percent total
Cracks - 1 to 5 cm wide when dry
COMPETING SERIES: These are the
Laplatta,
Mondey, and
Shar (T),
Streek (T) and
Wickiser (T) series. LaPlatta soils have Bk horizons and the solum range from slightly to strongly alkaline. Mondey soils contain carbonates below argillic horizons and do not have an O horizon. Shar soils are 20 to 40 inches deep to a lithic contact. Streek soils have mollic epipedons 8 to 19 inches thick, do not have an O horizon and are moderately well drained. Wickiser soils do not have an O horizon nor slickensides and do have secondary carbonates at 30 to 44 inches.
GEOGRAPHIC SETTING: Cleymor soils are on hill footslopes and structural benches at elevations of 3,650 to 5,550 feet. These soils formed in colluvium and slope alluvium from fine pyroclastic materials and basalt. Slopes range from 4 to 35 percent. The average annual precipitation is 24 to 30 inches. The average annual temperature is 42 to 45 degrees F. The frost-free period is 60 to 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the ,
Hess,
Hoff,
Lidos and
Pumpkin soils. Hoff soils are shallow over bedrock and on convex hill shoulders and backslopes. Hess and Lidos soils are fine-loamy and on hill backslopes and footslopes. Pumpkin soils are clayey-skeletal and on hill footslopes and toeslopes.
DRAINAGE AND PERMEABILITY: Well drained; medium to very rapid runoff; very slow permeability.
USE AND VEGETATION: Cleymor soils are used mainly for timber production and woodland grazing. Native vegetation is Douglas-fir, ponderosa pine, mallow ninebark and Geyers (elk) sedge.
DISTRIBUTION AND EXTENT: West-central Idaho. MLRA 43B. Cleymor soils are of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Boise County Area, Idaho, Parts of Ada and Boise Counties, 2005.
REMARKS: Diagnostic horizons and features recognized in this pedon:
Mollic epipedon - zone from the soil surface to 60 inches (A, ABt, Bt1, Bt2, Btss1, Btss2, Bt3 and Bt4 horizons)
Argillic horizon - zone from 7 to 60 inches (Bt1, Bt2, Btss1, Btss2, Bt3 and Bt4 horizons)
Particle-size control section - zone from 7 to 27 inches
Linear extensibility - 6.0 or more in the zone from 1 to 41 inches (assumed)
Soil moisture regime xeric
All depths to diagnostic horizons and features within the range of characteristics are measured from the top of the first mineral horizon.
National Cooperative Soil Survey
U.S.A.