LOCATION TODOS CAEstablished Series
TAXONOMIC CLASS: Fine, smectitic, thermic Typic Argixerolls
TYPICAL PEDON: Todos clay loam, irrigated orchard. (Colors are for dry soil unless otherwise noted.)
Ap--0 to 5 inches; dark reddish brown (5YR 3/2) clay loam, dark reddish (5YR 2/2) moist; moderate fine granular structure; hard, friable, sticky and plastic; many very fine, fine and medium roots; many very fine and medium interstitial pores; slightly acid (pH 6.5); clear wavy boundary. (0 to 8 inches thick).
A12-- 5 to 18 inches; dark reddish brown (5YR 3/2) clay loam, dark reddish brown (5YR 2/2) moist; weak fine subangular blocky structure; very hard, firm, sticky and plastic; common very fine and many medium and coarse roots; common very fine interstitial pores and many very fine, fine and medium tubular pores; slightly acid (pH 6.2); clear wavy boundary. (7 to 19 inches thick)
B21t--18 to 33 inches; dusky red (2.5YR 3/2) clay, very dusky red (2.5YR 2/2) moist; weak fine subangular blocky structure; very hard, very firm, very sticky and very plastic; common fine, medium and coarse roots; common very fine interstitial pores and common very fine and fine tubular pores; common thin clay films on faces of peds and lining pores; neutral (pH 7.0); gradual wavy boundary. (9 to 18 inches thick)
B22t--33 to 44 inches; dark reddish brown (2.5YR 3/4) clay, dark reddish brown (2.5YR 2/4) moist; moderate fine subangular blocky structure; very hard, very firm, very sticky and very plastic; few fine, medium and coarse roots; common very fine interstitial pores and few very fine and fine tubular pores; common thin clay films lining pores and many thin clay films on faces of peds; neutral (pH 7.3); clear wavy boundary. (7 to 15 inches thick)
Cr--44 to 56 inches; reddish brown (5YR 5/3) highly fractured soft shale, fractures more than 10 cm apart, reddish brown (5YR 4/3) moist; breaks down to clay loam, strongly effervescent with disseminated lime and lime in seams.
TYPE LOCATION: Santa Barbara County, California; about 11 miles west of Santa Barbara in Winchester Canyon; approximately 2,600 feet north of Los Padres National Forest boundary and 100 feet east of farm road on a fresh terrace cut.
RANGE IN CHARACTERISTICS: Depth to a paralithic contact is 40 to 60 inches. The mean annual soil temperature is about 59 to 62 degrees F. and the soil temperature is never below 47 degrees F. at any time. The soil becomes moist between depths of 4 and 12 inches in mid-November and remains moist until about mid-May. It is usually dry the rest of the year. Rock fragments make up about 5 percent of the soil volume except in horizons transitional to the parlithic contact where there is up to 20 percent gravel. Base saturation is more than 75 percent in all parts of the soil profile. It has 2 to 4 percent organic matter to a depth of 10 inches and decreases regularly to less than 1 percent at depths of 15 to 18 inches.
The A horizon is dark reddish brown or reddish brown (5YR 3/2, 3/3, 4/3) or dark brown (7.5YR 3/2, 4/2). It is clay loam or light clay. This horizon has weak to moderate granular or subangular blocky structure and is slightly acid or neutral.
The B2t horizon is dusky red, reddish brown, dark reddish brown, or yellowish red (2.5YR 3/2, 3/4, 4/4 or 5YR 3/3, 3/4, 4/3, 4/4, 4/6). It is clay with 35 to 48 percent clay, 6 to 10 percent (absolute) more clay than the A horizon. This horizon has weak or moderate subangular blocky structure. It is slightly acid to moderately alkaline and the lower part is calcareous in most areas.
The Cr horizon is sandstone or shale and is shattered and decomposed to depth of several feet. The parent material is reddish colored and imparts reddish colors to soils formed from it.
COMPETING SERIES: These are the Fagan, Gabino, Los Osos, Sespe and Sween series. Fagan soils have hue of 10YR or 2.5Y. Gabino, Los Osos, Sespe and Sween soils are all underlain by bedrock at depths of 24 to 40 inches.
GEOGRAPHIC SETTING: The Todos soils are on foothills and uplands. Elevations are 300 to 1400 feet. The soils formed in material weathered from reddish sandstone and shale of the Sespe formation. The climate is subhumid mesothermal with warm dry summers and cool moist winters. Mean annual precipitation is 17 to 22 inches. Average January temperature is 50 degrees to 53 degrees F., average July temperature is 67 degrees to 72 degrees F. and mean annual temperature is 60 degrees to 61 degrees F. The frost-free season is 300 to 330 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Sespe soils and the Ayar, Gaviota, Lodo and Maymen soils. Ayar soils have more than 35 percent clay and are calcareous throughout. Lodo, Gaviota and Maymen soils have a lithic contact at depths of less than 20 inches and lack of B2t horizon.
DRAINAGE AND PERMEABILITY: Well-drained; medium to rapid runoff; slow permeability.
USE AND VEGETATION: Used for watershed, range, some avocado and lemon plantings. Native vegetation is annual grasses, forbs, and scattered oaks and brush on lower slopes and chaparral brush on steep slopes.
DISTRIBUTION AND EXTENT: Mapped in a narrow east-to-west strip within 1 to 4 miles from the Pacific coastline in south coastal Santa Barbara County on the Sespe formation. The soils are inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Santa Barbara County, California, South Coastal Part, 1974.
REMARKS: Formerly mapped Sespe series in the Santa Barbara Area Soil Survey. Similar soils mapped Sespe series in Ventura Area. Todos soils average over 40 inches deep to a paralithic contact; Sespe soils are less than 40 inches deep.
OSED scanned by SSQA. Last revised by state on 6/76.