LOCATION FINROD CAEstablished Series
TAXONOMIC CLASS: Fine, mixed, superactive, thermic Pachic Haploxerolls
TYPICAL PEDON: Finrod clay loam - on a nearly level slope of less than 1 percent in a walnut orchard at 65 feet elevation. (Colors are for dry soil unless otherwise stated. When described on March 25, 1980, the soil was moist throughout.)
Ap--0 to 8 inches; brown (10YR 4/3) clay loam, very dark grayish brown (10YR 3/2) moist; moderate medium subangular blocky structure; hard, friable, sticky and plastic; common fine and very fine roots; few very fine interstitial and tubular pores; neutral (pH 6.8) gradual smooth boundary. (8 to 10 inches thick)
A--8 to 21 inches; brown (10YR 4/3) clay, variegated very dark grayish brown (10YR 3/2) and brown (10YR 4/3) moist; moderate medium subangular blocky structure; hard, friable, sticky and plastic; common fine and very fine roots; common very fine tubular pores; few pressure faces; slightly alkaline (pH 7.5); gradual smooth boundary. (12 to 20 inches thick)
Bw1--21 to 33 inches; yellowish brown (10YR 5/4) clay, variegated dark brown (10YR 3/3) and brown (10YR 4/3) moist; moderate medium subangular blocky structure; very hard, friable, sticky and plastic; few medium, fine and very fine roots; common very fine tubular pores; few pressure faces; slightly alkaline (pH 7.5); gradual wavy boundary. (7 to 13 inches thick)
Bw2--33 to 40 inches; brown (7.5YR 5/4) clay, variegated brown (10YR 4/3) and brown (7.5YR 4/4) moist; very dark gray (10YR 3/1) manganese stains; moderate coarse subangular blocky structure; very hard, friable, sticky and plastic; few very fine roots; few very fine tubular pores; many pressure faces; slightly alkaline (pH 7.5); gradual smooth boundary. (6 to 12 inches thick)
Bw3--40 to 48 inches; variegated light yellowish brown (10YR 6/4) and strong brown (7.5YR 4/6) clay, brown (7.5YR 4/4) and dark brown (7.5YR 3/4) moist; moderate coarse subangular blocky structure; very hard, friable, sticky and plastic; few very fine roots; few very fine tubular pores; many pressure faces; slightly alkaline (pH 7.8); abrupt smooth boundary. (7 to 12 inches thick)
Bqkm--48 to 60 inches; variegated very pale brown (10YR 7/4) and light yellowish brown (10YR 6/4) strongly cemented duripan, light yellowish brown (10YR 6/4) and brown (10YR 5/3) moist; massive; brittle; indurated continuous laminar capping 1 to 3 mm thick, strongly cemented in 50 percent of the matrix; slightly effervescent with segregated lime in seams and filaments; slightly alkaline (ph 7.8).
TYPE LOCATION: San Joaquin County, California; approximately 3 miles west of Linden, 1,240 feet south of Baker Road and 1880 feet east of Jack Tone Road in the SW1/4, NE1/4, NW1/4 of Sec. 18, T.2 N., R.8 E., MDBM Waterloo quadrangle.
RANGE IN CHARACTERISTICS: The mollic epipedon is 20 to 30 inches thick. Depth to thick duripan is 40 to 60 inches. The mean annual soil temperature is 62 or 63 degrees F. The soil moisture control section is dry in all parts from June to October unless irrigated, and moist in all parts from December through April. The particle-size control section has 35 to 50 percent clay. Organic matter decreases regularly with depth and is 1.5 percent at 220 inches.
The A horizon has color of 10YR 5/1, 5/2, 5/3, 4/2, 4/3; or 7.5YR 5/2 and moist color of 10YR 3/1, 3/2, 3/3; or 7.5YR 3/2. This horizon has 1 to 3 percent organic matter. It is clay loam, silty clay loam or clay.
The Bw horizon has color of 10YR 5/2, 5/3, 5/4, 6/2, 6/3, 6/4; or 7.5YR 5/4, 6/4 and moist color of 10YR 3/2, 3/3, 3/4, 4/2, 4/3, 4/4; or 7.5YR 3/4, 4/4. It is neutral to moderately alkaline. It is clay loam, silty clay loam or clay.
The Bqkm has color of 10YR 5/4, 6/4, 7/4; 7.5YR 5/4, 5/2 or 6/6 and moist color of 10YR 4/4, 5/3, 5/4, 6/4; or 7.5YR 4/4.
COMPETING SERIES: These are the Archerdale and Bussaca series. Archerdale soils lack duripans within 60 inches and have a combined A and Bw thickness of 60 inches or more. Bussaca soils do not have a duripan.
GEOGRAPHIC SETTING: Finrod soils are on low fan terraces and alluvial fans. Slopes are 0 to 2 percent. The soils formed in alluvium from mixed rock sources. Elevations are 35 to 150 feet. The climate is subhumid with hot dry summers and cool moist winters. Dense ground fog commonly occurs in the winter months. Mean annual precipitation is 14 inches. The mean January temperature is 45 degrees F; mean July temperature is 77 degrees F; and mean annual temperature is 60 degrees F. Frost-free period is 260 to 280 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Archerdale soils and the Cogna and Hollenbeck soils. Cogna soils are fine-silty on similar positions. Hollenbeck soils have intersecting slickensides, montmorillonitic mineralogy, wide cracks and are on lower basin positions.
DRAINAGE AND PERMEABILITY: Moderately well drained; slow runoff; slow permeability.
USE AND VEGETATION: Used mainly for irrigated cropland to grow almonds, walnuts, cherries, field and row crops such as bell peppers, beans, sugar beets, tomatoes, alfalfa and small grains. Vegetation is wild oats, soft chess, ripgut brome, filaree and other annual grasses, forbs and scattered California White Oaks.
DISTRIBUTION AND EXTENT: Low terraces in the northeastern San Joaquin Valley. These soils are not extensive in MLRA-17.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: San Joaquin County, California, 1990.
REMARKS: The activity class was added to the classification in February of 2003. Competing series were not checked at that time. - ET
Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from the surface to a depth of 21 inches (Ap, A)
Cambic horizon - the zone from 33 to 48 inches (Bw1, Bw2 horizons)
Duripan - the zone from 48 to 60 inches (Bqkm horizon)