LOCATION BOAR CAEstablished Series
TAXONOMIC CLASS: Fine, smectitic, thermic Mollic Haploxeralfs
TYPICAL PEDON: Boar loam, rangeland.
(Colors are for dry soil unless otherwise stated.
A1--0 to 5 inches; light brownish gray (10YR 6/2) loam, very dark grayish brown (10YR 3/2) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine roots; few very fine tubular and many very fine interstitial pores; slightly acid; abrupt wavy boundary.
A2--5 to 12 inches; grayish brown (10YR 5/2) loam, very dark grayish brown (10YR 3/2) moist; weak coarse and very coarse prismatic structure; hard, friable, slightly sticky and slightly plastic; many very fine roots; common very fine and few fine and medium tubular pores; neutral; clear wavy boundary.
Bt1--12 to 20 inches; dark grayish brown (2.5Y 4/2) clay loam, dark brown (10YR 3/3) moist; weak coarse and very coarse prismatic structure; hard, firm, sticky and plastic; few very fine roots; many very fine and few fine and medium tubular pores; few thin clay films in pores and bridging mineral grains; 3 percent gravel; neutral; abrupt wavy boundary.
Bt2--20 to 37 inches; variegated olive (5Y 5/3) and light olive brown (2.5Y 5/6) clay loam, dark grayish brown (2.5Y 4/2) and light olive brown (2.5Y 5/4) moist; weak coarse prismatic structure; hard, firm, sticky and plastic; many very fine tubular pores; many moderately thick clay films in pores; 30 percent soft saprolite masses; 7 percent gravel; slightly alkaline; clear wavy boundary.
Bt3--37 to 56 inches; olive gray (5Y 5/2) clay, olive gray (5Y 4/2) moist; weak coarse and very coarse subangular blocky structure; hard, firm, sticky and plastic; few very fine roots; common very fine tubular pores; common moderately thick clay films in pores; many pressure faces and few slickensides; 25 percent soft saprolite fragments; slightly effervescent; disseminated lime; moderately alkaline; clear wavy boundary.
Btk--56 to 75 inches; olive gray (5Y 5/2) clay loam, gray (5Y 5/1) moist; weak coarse and very coarse subangular blocky structure; hard, firm, slightly sticky and slightly plastic; few very fine roots; few very fine tubular pores; few moderately thick clay films in pores; common pressure faces; 70 percent soft saprolite fragments; strongly effervescent; disseminated lime; moderately alkaline.
TYPE LOCATION: Lake County, California; about 5 miles north of Lakeport; about 3,250 feet northwest of the Sewage Treatment Plant gate; 2,125 feet north and 1,812 feet west of the southeast corner of section 25, T.15 N., R.10 W., MDB&M; 39 degrees, 7 minutes, 10 seconds north latitude, 122 degrees, 54 minutes, 55 seconds west longitude, USGS Lakeport California quadrangle.
RANGE IN CHARACTERISTICS: Thickness of the solum and depth of the profile are 60 inches or more. The mean annual soil temperature is 59 degrees to 63 degrees F. The soil between the depths of 8 and 24 inches is dry in all parts from July 1 to October 15 and is moist in all parts from December 1 to April 30. Slickensides are not present in all pedons. Base saturation is (sum of cations) 75 to 95 percent throughout the profile.
The A horizon has dry color of 10YR 5/2, 5/3, 5/4, 6/2, 6/3 or 6/4. Moist colors are 10YR 3/2, 3/3 or 3/4. Organic matter content is 0.25 to 1.0 percent below a depth of 10 inches. Texture is loam. Clay content is 15 to 26 percent. Reaction is slightly acid or neutral.
The Bt horizon has dry color of 10YR or 5Y 4/2, 4/3, 5/2, 5/3; 2.5Y 4/2, 5/2, 5/6. Moist color is 10YR or 5Y 3/1, 3/2, 3/3, 4/1, 4/2, 4/3, 4/4, 5/1, 5/2; 2.5Y 3/2, 4/2, 5/2, 5/4. Texture is clay loam or clay and has 35 to 45 percent clay. Reaction is neutral to moderately alkaline. Disseminated lime is not present in all pedons.
COMPETING SERIES: These are the
Azule,
Rincon, (T)
Shoba,
Skyhigh,
Sleeper and
Stomar series. Azule soils are 20 to 40 inches deep a paralithic contact. Rincon soils are greater than 60 inches deep, formed on alluvial fans and stream and marine terraces and have a difference between mean summer and mean winter temperatures of less than 19 degrees F.
Shoba and Skyhigh soils have a lithic contact at 20 to 40 inches. Sleeper soils have a lithic contact at 40 to 60 inches. Stomar soils are on gently sloping alluvial fans and terraces.
GEOGRAPHIC SETTING: Boar soils are on hills and mountains. Slopes are 5 to 50 percent. Elevations are from 1,250 to 2,500 feet. The climate is subhumid with cool wet winters and hot dry summers. Mean January temperature is 41 degrees F; mean July temperature is 68 degrees F; mean annual temperature varies from 55 degrees to 60 degrees F. The mean annual precipitation varies from 18 to 40 inches. The frost-free season varies from 155 to 210 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Sleeper, Skyhigh and the Millsholm soils. Sleeper soils have lithic contacts at 40 to 60 inches. Skyhigh soils have lithic contacts at 20 to 40 inches. Millsholm soils are 10 to 20 inches deep.
DRAINAGE AND PERMEABILITY: Well drained; medium to very high runoff; slow permeability.
USE AND VEGETATION: Used for livestock grazing and watershed. Vegetation is wild oats, soft chess, filaree, medusahead, blue oak and live oak.
DISTRIBUTION AND EXTENT: Interior Coast Range Mountains of California. The soils are not extensive. MLRA 15.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Lake County, California, 1996.
REMARKS: This series establishes the former Sleeper Variant as published in the 1989 Lake County, California, Soil Survey.