LOCATION KIDD CA
Established Series
Rev. SBJ/DJE/JJJ/AEC
05/2018
KIDD SERIES
The Kidd series consists of shallow, somewhat excessively drained soils formed in material weathered from rhyolitic tuff and rhyolite. Kidd soils are on hills and have slopes of 2 to 75 percent. The mean annual precipitation is about 45 inches and the mean annual temperature is about 56 degrees F.
TAXONOMIC CLASS: Loamy, mixed, superactive, mesic Lithic Haploxerepts
TYPICAL PEDON: Kidd gravelly loam--on a northwest facing convex slope of 35 percent under brush and scattered conifers at 1,400 feet elevation. (Colors are for dry soil unless otherwise stated. When described on November 14, 1972, the soil was moist throughout).
A--0 to 4 inches (0 to 10 cm); grayish brown (10YR 5/2) and very pale brown (10YR 7/3) gravelly loam, dark brown (7.5YR 3/2) and brown (7.5YR 4/4) moist; moderate medium crumb structure; slightly hard, friable, slightly sticky, and slightly plastic; many fine and medium roots; many very fine and fine interstitial and tubular pores; moderately acid (pH 5.8); clear smooth boundary. (3 to 8 inches thick)
Bw1--4 to 10 inches (10 to 25 cm); very pale brown (10YR 7/3) loam, brown (7.5YR 4/4) and brown (7.5YR 5/4) moist; weak medium subangular blocky and weak medium crumb structure; slightly hard, friable, slightly sticky, slightly plastic; common fine and coarse, few very fine roots; many very fine and fine, common medium interstitial and tubular pores; continuous thin clay films on peds, in pores and as bridges between mineral grains; moderately acid (pH 6.0); clear wavy boundary. (4 to 10 inches thick)
Bw2--10 to 14 inches (25 to 36 cm); very pale brown (10YR 8/3) loam, light yellowish brown (10YR 6/4) moist; massive; hard, friable, slightly sticky, slightly plastic; few fine roots; many fine tubular pores; very thin clay films in pores; moderately acid (pH 6.0); abrupt irregular boundary. (3 to 6 inches thick)
R--14 to 18 inches (36 to 46 cm); white (10YR 8/1) shattered rhyolitic tuff
TYPE LOCATION: Napa County, California; about 2 miles southwest of Angwin; about 500 feet west from intersection of Deer Park Road and Crestmont Drive and 100 feet south of Deer Park Road; in the SW 1/4 SW 1/4 section 7, T.8 N., R.5 W. 38 degrees 33 minutes 21.2 seconds North, 122 degrees 27 minutes 56.7 seconds West, NAD83.
RANGE IN CHARACTERISTICS: Depth to bedrock is 10 to 20 inches (25 to 51 cm). The mean annual soil temperature is 55 degrees to 59 degrees F, and the soil temperature usually is not below 47 degrees F at any time. The soil to bedrock is dry in all parts from about June 5 until October 15 and is moist in all parts from December through April 30. Rock fragments, mostly 1/2 to 3 inches in size, makeup about 10 to 35 percent of the soil. Rock fragments commonly increase as depth increases and exceed 35 percent in the lower part of the Bw horizon in some pedons. They average less than 35 percent in the control section.
The A horizon is 10YR with value of 4 through 8 dry, 3, 4, or 5 moist, and chroma of 1 through 4 dry, and 1, 2, or 3 moist. Some pedons are 7.5YR 4/4 or 5/4 moist. It is gravelly loam, sandy loam or fine sandy loam and has weak or moderate granular or crumb structure. It is slightly or medium acid.
The Bw horizon is 10YR or 7.5YR hue with value of 4 through 8 dry and 4 through 6 moist and chromas of 1, 2, 3 or 4 dry and 3 or 4 moist. It is sandy loam, clay loam, gravelly loam or loam and has granular or crumb structure or is massive. It is slightly through strongly acid.
COMPETING SERIES: These are the
Crater Lake,
Forward, and
Synarep series in other families. Crater Lake and Synarep soils are more than 60 inches deep. Forward soils are 20 to 40 inches deep to a lithic or paralithic contact.
GEOGRAPHIC SETTING: Kidd soils are on hills. Slopes are 2 to 75 percent. The soils formed in material weathered from rhyolitic tuff and rhyolite. Elevations are 500 to 4,300 feet. The climate is subhumid with warm to hot dry summers and cool moist winters. Mean annual precipitation is 30 to 60 inches. Mean January temperature is 40 degrees F; mean July temperature is 72 degrees F; and mean annual temperature varies from 50 degrees to 56 degrees F. Frost-free season is 145 to 260 days.
GEOGRAPHICALLY ASSOCIATED SOILS: This is the competing
Forward soil and the
Boomer,
Cohasset,
Goulding,
Hambright,
Henneke,
Los Gatos, and
Neuns soils. Boomer, Cohasset, Henneke, and Los Gatos soils have argillic horizons and lack medial control sections. Goulding soils lack medial control sections and have frigid temperature regimes. Hambright soils have mollic epipedons, loamy-skeletal control sections, and thermic temperature regimes. Neuns soils have bulk density of 1 or more and have loamy-skeletal control sections.
DRAINAGE AND PERMEABILITY: Well-drained to excessively drained; medium to very rapid runoff; moderately rapid or rapid permeability.
USE AND VEGETATION: Used for watershed and recreation with some very limited grazing. Natural vegetation is hoary manzanita, chamise, ceanothus, scrub oak, knobcone pine, grasses, forbs and scattered ponderosa pine.
DISTRIBUTION AND EXTENT: Northern Coast Range Mountains and Cascade Range of California. The soils are moderately extensive in MLRAs 15 and 18.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Napa County, California, 1974.
REMARKS: The Kidd soils mapped with depths that range from 5 to 20 inches was changed to eliminate those soils with depths of 5 to 10 inches. Soils with depths less than 10 inches would exclude cambic horizons.
Series reclassified 5/95. Mineralogy family added 3/97. Competing series not updated at that time.
Series reclassified on 5/2018 with insufficient lab data and the assumption that soils in the Sonoma volcanics lack ASP. - AEC
ADDITIONAL DATA: NSSL pedon S72CA-055-001 (type location). Andic soil porperties were not run on the type location samples.
National Cooperative Soil Survey
U.S.A.