LOCATION ZEPPELIN CAEstablished Series
TAXONOMIC CLASS: Fine, smectitic, thermic Pachic Argixerolls
TYPICAL PEDON: Zeppelin very fine sandy loam, on a north facing 13 percent slope under a cover of annual grasses and forbs at an elevation of 420 feet. When described the soil was moist throughout. (Colors are for dry soil unless otherwise noted).
A1--0 to 2 inches, (0 to 6 cm); dark grayish brown (10YR 4/2) broken face very fine sandy loam, very dark brown (10YR 2/2) broken face moist; 18 percent clay; moderate medium subangular blocky structure; slightly hard, very friable, slightly sticky, slightly plastic; many very fine roots; many very fine interstitial pores; slightly acid, pH 6.4 by pH meter 1:1 water; abrupt smooth boundary.
A2--2 to 7 inches, (6 to 19 cm); dark grayish brown (10YR 4/2) broken face loam, very dark brown (10YR 2/2) broken face moist; 21 percent clay; moderate medium subangular blocky structure; slightly hard, very friable, moderately sticky, slightly plastic; common very fine roots; many very fine interstitial pores; slightly acid, pH 6.4 by pH meter 1:1 water; abrupt smooth boundary. (combined thickness of the A horizons is 19 to 60 centimeters)
Bt1--7 to 19 inches, (19 to 48 cm); dark grayish brown (10YR 4/2) broken face loam, very dark grayish brown (10YR 3/2) broken face moist; 25 percent clay; moderate medium subangular blocky structure; slightly hard, very friable, moderately sticky, moderately plastic; common very fine roots; many very fine tubular pores; 90 percent clay films on all faces of peds; slightly acid, pH6.5 by pH meter 1:1 water; abrupt smooth boundary.
Bt2--19 to 30 inches, (48 to 77 cm); dark grayish brown (10YR 4/2) broken face clay, very dark grayish brown (10YR 3/2) broken face moist; 40 percent clay; weak medium subangular blocky structure; hard, firm, moderately sticky, very plastic; common very fine tubular pores; 60 percent clay films on all faces of peds; slightly acid, pH 6.6 by pH meter 1:1 water; clear smooth boundary. (combined thickness of the Bt horizons is 40 to 60 centimeters)
BCt--30 to 40 inches, (77 to 100 cm); 10 percent dark grayish brown (2.5Y 4/2) broken face and 90 percent light olive brown (2.5Y 5/3) broken face clay, 10 percent very dark grayish brown (2.5Y 3/2) broken face and 90 percent olive brown (2.5Y 4/3) broken face moist; 40 percent clay; moderate coarse subangular blocky structure; hard, friable, moderately sticky, very plastic; common very fine tubular pores; 80 percent clay films on all faces of peds; neutral, pH 6.8 by pH meter 1:1 water; abrupt smooth boundary.
Cr--40 to 43 inches, (100 to 110 cm); moderately cemented sandstone bedrock, slightly hard, very fine grained.
TYPE LOCATION: Santa Clara County, California, Stanford University Academic Preserve, west of large satellite dish, south and west of recreation trail to creek, on north slope., in an unsectionalized area of Township 6s, Range 3w,
UTM Northing 41406616, UTM Easting 572210, Zone 10, NAD83. - U.S.G.S Quad:
Palo Alto, California.
RANGE IN CHARACTERISTICS:
Depth to weakly cemented sandstone is 100 to 126 centimeters. The mean annual soil temperature is 60 to 62 degrees F. The soil moisture control section is dry in all parts from about May 1 to November 1 (about 180 days). The particle size control section averages 35 to 45 percent clay, with 0 to 20 percent rock fragments, mostly gravel. Mineralogy is mixed. The soil is not calcareous. Organic matter ranges from 1 to 3 percent to a depth of 20 centimeters.
The A horizon dry color is 10YR 5/4, 5/3, 5/1 or 4/2. Moist color is 10YR 3/4, 3/3, 3/2, 2/2. Texture is very fine sandy loam, fine sandy loam or loam. Clay content ranges from 12 to 25 percent. Rock fragments range from 0 to 5 percent and are gravel in size. Reaction ranges from 5.6 to 6.6.
The Bt and BCt horizons dry color is 10YR 6/4, 5/6, 5/2, 4/4; 2.5Y 7/3, 6/3, 5/3 or 4/2. Moist color is 10YR 4/6, 4/4, 4/2, 3/2; 2.5Y 5/3, 4/3 or 3/2. Texture is clay, sandy clay and clay loam. Clay content ranges from 35 to 45 percent. Rock fragments range from 0 to 20 percent and are gravel in size. Reaction ranges from 5.6 to 6.6.
COMPETING SERIES: These are the Casino, Danville, Halyard and the Windage soils. Casino soils are moderately deep to a lithic contact of andesite. Danville soils are very deep and are on alluvial fans and terraces. Halyard soils are moderately deep to a paralithic contact of basalt, andesite or breccia. Windage soils are very deep on uplifted marine terraces on islands.
GEOGRAPHIC SETTING: Zeppelin soils are on hills. Slopes are 5 to 50 percent. These soils formed in residuum weathered from fine grained sandstone. Elevation is 160 to 530 feet. Mean annual precipitation is 18 to 22 inches. The mean
annual temperature is 59 to 62 degrees F. Frost free season is 275 to 325 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Mccoy and Sehorn soils. The Mccoy soils are fine-loamy and moderately deep to a paralithic contact of sandstone, the Sehorn soils are fine textured throughout and are moderately deep to a paralithic contact of sandstone or shale.
DRAINAGE AND PERMEABILITY: Well drained; slow permeability.
USE AND VEGETATION: This soil is used for recreation and home sites. Vegetation is annual grasses with scattered oaks.
DISTRIBUTION AND EXTENT: The soils are not extensive and are mapped in northern Santa Clara County. Major Land Resource Area: 15 -- Central California Coast Range
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Santa Clara County, California 2009. Source of name from historic zeppelins moored at Moffitt Field.
REMARKS:
Particle Size Control Section for this pedon: 7 to 27 in. (19 to 69 cm)
Diagnostic horizons and features recognized in this pedon are:
Mollic Epipedon: 0 to 30 in. (0 to 77 cm)
Argillic Horizon: 19 to 40 in. (48 to 100 cm)
The soil moisture control section is dry in all parts from about May 1 to November 1 (about 180 days).
ADDITIONAL DATA:
Pedon information for this type location only: NASIS SITE and PEDON ID: 08ca085641157