LOCATION YSIDORA CAEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, thermic Haplic Durixeralfs
TYPICAL PEDON: Ysidora gravelly very fine sandy loam - annual grass pasture. (Colors are for dry conditions unless otherwise noted)
A11--0 to 6 inches; brown (7.5YR 5/4) gravelly very fine sandy loam, dark brown (7.5YR 4/2) moist; weak medium subangular blocky structure; slightly hard, friable, nonsticky and slightly plastic; abundant very fine roots; many very fine interstitial pores; medium acid (pH 5.7); gradual, smooth boundary. (4 to 8 inches thick)
A12--6 to 12 inches; brown (7.5YR 5/4) gravelly loam, dark brown (7.5YR 4/2) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; abundant very fine roots; many very fine and common fine tubular pores; medium acid (pH 5.7); clear, wavy boundary. (5 to 7 inches thick)
B21t--12 to 19 inches; reddish brown (5YR 4/4) gravelly clay loam, dark reddish brown (5YR 3/4) moist; moderate medium subangular blocky structure; hard, firm, sticky and plastic; abundant very fine roots; many very fine and common fine tubular pores; common moderately thick clay films on ped faces and in pores; slightly acid (pH 6.2); clear, wavy boundary. (4 to 9 inches thick)
B22t--19 to 25 inches; reddish brown (2.5YR 4/4) gravelly clay loam, dark reddish brown (2.5YR 3/4) moist; moderate medium subangular blocky structure; hard, firm, sticky and plastic; abundant very fine roots; many very fine and few fine tubular pores; common moderately thick clay films on ped faces and in pores; slightly acid (pH 6.2); clear, wavy boundary. (4 to 8 inches thick)
B3--25 to 29 inches; brown to dark brown (7.5YR 4/4) gravelly clay loam, dark reddish brown (5YR 3/3) moist; massive; hard, firm, sticky and plastic; few very fine roots; few very fine tubular pores; common moderately thick clay films in pores; slightly acid (pH 6.3); abrupt, wavy boundary. (2 to 6 inches thick)
Cm--29 inches +; olive gray (5Y 4/2) gravelly sandy loam, dark olive gray (5Y 3/2) moist; massive; extremely hard, extremely firm; nonsticky and nonplastic; light gray (10YR 7/2) siliceous coatings along cleavage planes; neutral (pH 7.0). Many feet thick.
TYPE LOCATION: Riverside County, California; approximately 1,200 feet east, 1,000 feet north of the southwest corner Section 5, T8S, R3W, about 4 miles west of Temecula, California.
RANGE IN CHARACTERISTICS: The A horizon range from dark brown to yellowish brown, with hues of 10YR, values of 4 to 5, 3 to 4 moist, and chromas of 3 to 4, fine sandy loam to loam, and medium to slightly acid. Proportion of coarse fragments ranges from about 10 to 50 percent. The Bt horizons range from brown to reddish brown, with hues from 2.5YR to 7.5YR, values of 4 to 5, 3 to 4 moist, and chromas of 3 to 4, gravelly loam to gravelly clay loam, and medium to slightly acid. The Cm horizon ranges from grayish brown to olive gray, with hues of 10YR to 5Y, values of 4 to 5, 3 to 4 moist, and chromas of 2 to 3, sometimes faintly mottled, and slightly acid to mildly alkaline, often slightly effervescent in seams.
COMPETING SERIES: The Ysidora soils resemble those of the Arlington, Arbuckle, Buren, Hillgate, Jalama, Perkins, and Redding series. The Arlington soils have sandy loam argillic horizons and duripans with less than 15 percent coarse fragments, and are developed in alluvium predominantly from granitic rocks. The Arbuckle soils lack duripans immediately below the argillic horizon. The Buren soils have argillic horizons and duripans with less than 15 percent coarse fragments, and are developed in alluvium predominantly from basic igneous rocks. The Hillgate soils have argillic horizons with less than 15 percent coarse fragments, and lack duripans immediately below the argillic horizon. The Jalama soils have dark gray to dark grayish brown, medium to strongly acid argillic horizons. The Perkins soils have fine textured argillic horizons, and lack duripans immediately below the argillic horizon. The Redding soils are medium to strongly acid, and have strongly indurated very gravelly duripans.
GEOGRAPHIC SETTING: The Ysidora soils occur on gently to strongly sloping alluvial fans and terraces, at elevations of about 500 to 2,500 feet. The climate is one of long, dry summers and mild, moist winters, with an average annual rainfall of 10 to 15 inches. The average January temperature is 52 degrees F., the average July temperature 75 degrees F., and the average annual temperature 63 degrees F.
PRINCIPAL ASSOCIATED SOILS: The Ysidora soils are associated with those of the Arbuckle, Cortina, Lodo, and Perkins series. The Cortina soils are developed in moderately coarse, very gravelly recent alluvium, and lack diagnostic subsurface horizons. The Lodo soils are underlain by hard metamorphic rock at less than 20 inches.
DRAINAGE AND PERMEABILITY: The Ysidora soils are moderately well drained, very slowly permeable, with medium run-off.
USE AND VEGETATION: The native vegetation consists of annual grasses and forbs. They are used mostly for pasture or grain, with some citrus plantings in areas supplied with irrigation water.
DISTRIBUTION AND EXTENT: The Ysidora soils occur in the intermediate and coastal valleys of Southern California, where they are of limited extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Capistrano Area, California, 1929.
REMARKS: The Ysidora soils were formerly classified as noncalcic brown soils, University of California profile group VI.
OSED scanned by SSQA. Last revised by state on 9/66.