LOCATION CAMPCREEK OREstablished Series
TAXONOMIC CLASS: Fine, smectitic, frigid Vertic Palexerolls
TYPICAL PEDON: Campcreek very gravelly ashy loam - on a 20 percent convex south-facing slope, rangeland. (Colors are for moist soil unless otherwise noted.)
A1--0 to 2 inches; very dark grayish brown (10YR 3/2) very gravelly ashy loam, grayish brown (10YR 5/2) dry; moderate fine granular structure; soft, friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine and fine continuous irregular pores; 45 percent gravel; neutral (pH 6.8); clear smooth boundary. (2 to 5 inches thick)
A2--2 to 8 inches; very dark grayish brown (10YR 3/2) very gravelly ashy loam, grayish brown (10YR 5/2) dry; moderate fine and medium subangular blocky structure; slightly hard, firm, slightly sticky and slightly plastic; many very fine and fine roots; many very fine and fine continuous tubular pores; 35 percent gravel; neutral (pH 6.8); clear smooth boundary. (3 to 7 inches thick)
Bw--8 to 15 inches; very dark grayish brown (10YR 3/2) clay loam, grayish brown (10YR 5/2) dry; moderate medium and coarse subangular blocky structure; slightly hard, firm, slightly sticky and slightly plastic; common very fine and fine roots; common very fine and fine continuous tubular pores; 10 percent gravel; neutral (pH 7.0); abrupt smooth boundary. (4 to 10 inches thick)
2Bt--15 to 27 inches; dark yellowish brown (10YR 4/4) clay, dark yellowish brown (10YR 4/4) dry; strong very coarse angular blocky structure; hard, very firm, very sticky and very plastic; few very fine roots; few very fine discontinuous tubular pores; many thick clay films on face of peds and in pores; neutral (pH 7.2); clear smooth boundary. (11 to 17 inches thick)
2Btk1--27 to 51 inches; brown (7.5YR 4/4) clay, brown (7.5YR 4/4) dry; strong very coarse angular blocky structure; hard, very firm, very sticky and very plastic; many thick clay films on face of peds; strongly effervescent with segregated lime in blotches; moderately alkaline (pH 8.0); clear smooth boundary. (20 to 30 inches thick)
2Btk2--51 to 65 inches; brown (7.5YR 4/4) silty clay, strong brown (7.5YR 5/6) dry; moderate medium subangular blocky structure; slightly hard, firm, sticky and plastic; few thin clay films on face of peds; slightly effervescent with segregated lime in blotches; moderately alkaline (pH 8.0).
TYPE LOCATION: Baker County, Oregon; located 1,800 feet west and 1,400 feet north of the SE corner of sec. 28, T. 13 S., R. 37 E.
RANGE IN CHARACTERISTICS: These soils are usually moist, but are dry in all parts between about 4 to 12 inches for 50 to 80 consecutive days following the summer solstice. The mean annual soil temperature is 43 to 47 degrees F. Depth to the substratum is typically greater than 60 inches, but is 40 to 60 inches in some pedons. Thickness of the mollic epipedon is 10 to 20 inches. Hue is 10YR or 7.5YR. There is an absolute increase in clay content of 15 to 30 percent between the Bw and 2Bt horizons.
The A horizon has value of 2 or 3 moist, 4 or 5 dry and chroma of 2 or 3 moist and dry. It is ashy loam, gravelly ashy silt loam or very gravelly ashy loam and has 10 to 45 percent gravel. Ammonium oxalate extractable aluminum plus one-half iron is 0 to 0.4 percent and volcanic glass content is 5 to 20 percent.
The Bw horizon (E horizon in some pedons) has value of 2, 3 or 4 moist, 4, 5, or 6 dry and chroma of 2 through 6 moist and dry. It is loam, silt loam, gravelly loam, clay loam or silty clay loam. It has 0 to 30 percent gravel.
The 2Bt horizon has value of 4 or 5 moist and dry and chroma of 3 or 4 moist and dry. It is clay, gravelly silty clay or gravelly clay, has 45 to 60 percent clay and 0 to 30 percent gravel.
The 2Btk horizon, when present, has value of 4 or 5 moist and dry and chroma of 4 through 6 moist and dry. It is clay or silty clay, averaging 50 to 60 percent clay. It has 0 to 15 percent gravel. It is slightly to strongly effervescent. The 2Ck horizon (BC horizon in some pedons), when present, has hue of 2.5Y or 10YR, value of 4 or 5 moist, 5 or 6 dry and chroma of 4 through 6 moist and dry. It is clay loam silty clay loam, silt loam or very gravelly silty clay loam with 20 to 33 percent clay and 10 to 45 percent gravel. It is slightly to violently effervescent. (BC horizons in some pedons are non-effervescent.)
COMPETING SERIES: These are the Booth, Carryback, Crowcamp, Golars, Hankins, Jesh, Joenchris, Locrol, Longbarn, Tippett, Warpaint and Zumwalt soils, Booth, Carryback, Golars and Zumwalt soils are moderately deep to bedrock. Crowcamp soils have an aridic moisture regime. Hankins, Tippett and Warpaint soils have a surface layer over 7 inches thick that meets vitrandic subgroup criteria. Jest soils are on mountains. Joenchris soils are on fans. Lacrol soils are moderately well drained with episaturation from March to May. Longbarn soils are deep to bedrock with a 3 to 7 inch thick vitrandic surface layer.
GEOGRAPHIC SETTING: The Campcreek soils are on south-facing side slopes of terraces. Slopes are 12 to 60 percent. Elevations range from 3,500 to 5,000 feet. The soils formed in mixed alluvium. The mean annual precipitation is 12 to 18 inches. The mean annual temperature is 40 to 45 degrees F. The frost-free period is 60 to 90 days. This soil is on the Eola geomorphic surface.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Marack, Rastus, Skullgulch, and Wahstal soils. Marack soils are on adjacent lower terraces, have a calcic horizon and border on an aridic moisture regime. Rastus and Wahstal soils are on terrace tops and have indurated duripans. The Skullgulch soils are mapped in association with Campcreek soils; Skullgulch soils are on north aspects and have a mollic epipedon greater than 20 inches thick.
DRAINAGE AND PERMEABILITY: Well drained. Runoff is medium to rapid. Permeability is moderately slow in the surface horizons and slow in the subsoil.
USE AND VEGETATION: These soils are used for rangeland. The native vegetation is bluebunch wheatgrass, Idaho fescue, mountain big sagebrush and gray rabbitbrush.
DISTRIBUTION AND EXTENT: Eastern Oregon. The series is inextensive
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Baker County Area, Oregon, 1988.
REMARKS: Diagnostic horizons and features in this pedon are:
Mollic epipedon - the zone from the surface of the soil to a depth of approximately 15 inches (A1, A2, 2B horizons).
Argillic horizon - the zone from approximately 15 to 65 inches (2Bt, 2Btk1, 2Btk2 horizons).
"Pale" feature - argillic horizon with clayey particle-size class and abrupt upper boundary (2Bt horizon).