LOCATION KAWENGA CAEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, thermic Pachic Argixerolls
TYPICAL PEDON:
Oe--0 to 2 inches (0 to 5 centimeters); Ceanothus leaves and twigs. (0 to 6 inches thick)
A1--2 to 10 inches (5 to 25 centimeters); brown (10YR 5/3) gravelly loam, dark brown (10YR 3/3) moist; moderate fine subangular blocky structure; slightly hard, very friable, slightly sticky and non-plastic; many very fine, few fine and medium roots; few very fine tubular pores; 20 percent fine and medium subangular gravel; neutral (pH 7.0); clear smooth boundary.
A2--10 to 27 inches (25 to 68 centimeters); brown (10YR 5/3) loam; dark brown (10YR 3/3) moist; moderate fine subangular blocky structure; slightly hard, very friable, slightly sticky and non-plastic; few very fine through medium roots; few very fine tubular pores; 5 percent fine and medium subangular gravel; neutral (pH 6.9); clear smooth boundary. (Combined thickness of A1 and A2 horizons is 20 to 34 inches thick)
Bt--27 to 37 inches (68 to 93 centimeters); light yellowish brown (10YR 6/4) clay loam, dark yellowish brown (10YR 4/4) moist; moderate fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; few very fine through medium roots; few very fine tubular pores; few thin clay films on ped faces and lining pores; 5 percent fine and medium subangular gravel; neutral (pH 6.6); clear smooth boundary. (5 to 15 inches thick)
BC--37 to 55 inches (93 to 138 centimeters); mixed matrix 85 percent pale brown (10YR 6/3) and 15 percent light yellowish brown (10YR 6/4) loam, 85 percent dark brown (10YR 3/3) and 15 percent dark yellowish brown (10YR 4/4) moist; moderate fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; few very fine through medium roots; few very fine tubular pores; 10 percent pararock fragments of very soft sandstone; 5 percent fine and medium subangular gravel; neutral (pH 6.6); clear wavy boundary. (10 to 30 inches thick)
Cr--55 to 60 inches (138 to 150 centimeters); very soft, highly weathered, easily excavated and augerable white sandstone.
TYPE LOCATION: Los Angeles, California; on the north side of Castro Peak at an elevation of 1850 feet; 700 feet west and 2700 feet north of the southeast corner of section 9, T. 1 S., R. 18 W.; Latitude 34 degrees, 6 minutes, 56 seconds north and Longitude 118 degrees, 45 minutes, 51 seconds west; Point Dume Quadrangle
.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature: 59 to 63 degrees F.
Soil moisture: Soil is moist in mid to late November until June.
Depth to soft rock: 40 to 60 inches (100 to 150 centimeters).
Organic matter content: 2 to 4 percent.
Reaction is moderately acid to neutral.
A horizondry colors 10YR 5/2, 5/3, 4/3, 4/2; moist colors 10YR 3/2, 3/3.
Texture--Loam, sandy loam, gravelly sandy loam or gravelly loam.
Clay percentage--12 to 27 percent.
Coarse fragments--5 to 30 percent, dominantly gravel.
Bt horizondry colors 10YR 4/3, 5/2, 5/3, 5/4, 6/3, 6/4; moist colors 10YR 3/2, 3/3, 3/4, 4/2, 4/3, 4/4.
Texture--Loam, gravelly loam, clay loam or gravelly clay loam.
Clay percentage--18 to 35 percent.
Coarse fragments--5 to 30 percent, dominantly gravel.
BC horizondry colors 10YR 5/2, 5/3, 5/4, 6/3, 6/4; moist colors 10YR 3/2, 3/3, 4/2, 4/3, 4/4.
Texture--Loam, gravelly loam, clay loam or gravelly clay loam.
Clay percentage--10 to 35 percent.
Coarse fragments--5 to 30 percent, dominantly gravel.
COMPETING SERIES: These are the Alumrock, Arujo, Botella, Chico, Elkhorn, Havala, Lockwood, McCoy, Minlum, Rimtrail, Saltcanyon, Sapwi and Tongva soils. Arujo soils have 33 degrees F.difference between mean summer soil temperatures and mean winter soil temperatures and do not have more than 10 percent coarse fragments. Bottella, Chico, Elkhorn, Havala, Lockwood, Minlum, Rimtrail and Saltcanyon soils do not have paralithic bedrock within 60 inches. Alumrock, McCoy and Tongva soils have a paralithic bedrock at 25 to 40 inches. Sapwi soils have a lithic contact at 20 to 40 inches.
GEOGRAPHIC SETTING: Kawenga soils are on northerly and easterly facing, concave, side slopes of hills and mountains. These soils formed in residuum and colluvium derived from sandstone. Slopes are 15 to 75 percent. Elevations are 500 to 3000 feet. The climate is characterized by warm, dry summers and cool, moist winters. The mean annual precipitation is 18 to 24 inches, the mean annual temperature is 57 to 61 degrees F., and the frost free season is to 290 to 330 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Mipolomol (T), Sapwi (T), Topanga (T), and Zumaridge (T) soils. All these soils are on side slopes of hills and mountains. Mipolomol and Topanga soils are shallow to rock. Sapwi soils are moderately deep to an R horizon and lack BC horizons. Zumaridge soils lack argillic horizons and are shallow to rock.
DRAINAGE AND PERMEABILITY: Well drained; low to very high runoff; moderate permeability.
USE AND VEGETATION: Wildlife habitat, recreation and building site development. Vegetation is Greenbark chaparral, Big Pod chaparral, Chamise chaparral, Bush Monkey Flower, and miscellaneous forbs and grasses.
DISTRIBUTION AND EXTENT: Ventura County, Los Angeles County and Santa Clara County, California. The soil is not extensive. MLRA 20 and MLRA 15.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California.
SERIES ESTABLISHED: Los Angeles County, California, 2000.
REMARKS: Diagnostic horizons and features recognized in this pedon: Competing series checked 11/2009.
Mollic epipedon--The zone from the soil surface to a depth of about 27 inches (A1 and A2 horizons).
Argillic horizon--The zone from a depth of 27 inches to a depth of about 37 inches (Bt horizon).
Paralithic rock--The zone at a depth of 55 inches to greater than 60 inches (Cr horizon).