LOCATION GLENVIEW CAEstablished Series
TAXONOMIC CLASS: Fine, halloysitic, mesic Ultic Palexeralfs
TYPICAL PEDON: Glenview very gravelly loam - on a northwest facing convex slope of 17 percent under a clean tilled irrigated walnut orchard at 2,200 feet elevation. (Colors are for dry soil unless otherwise stated. When described on June 25, 1981, the soil was moist below 15 inches.)
Ap1--0 to 1 inches; brown (7.5YR 5/4) very gravelly loam, dark brown (7.5YR 3/4) moist; weak fine subangular blocky structure; hard, friable, moderately smeary, slightly sticky and slightly plastic; few fine roots; many very fine and fine interstitial pores; 40 percent obsidian fragments 2 to 25 mm in diameter; neutral (pH 7.0); clear wavy boundary. (1 to 2 inches thick)
Ap2--1 to 6 inches; brown (7.5YR 5/4) gravelly loam, dark brown (7.5YR 3/4) moist; weak fine and medium subangular blocky structure; hard, friable, moderately smeary, slightly sticky and slightly plastic; few fine roots; many very fine and fine interstitial pores; 30 percent obsidian fragments 2 to 25 mm in diameter; neutral (pH 7.0); abrupt wavy boundary. (4 to 10 inches thick)
BAt--6 to 15 inches; reddish yellow (5YR 6/6) clay loam, yellowish red (5YR 4/6) moist; moderate fine and medium angular blocky structure; very hard, friable, moderately smeary, sticky and plastic; few fine roots; common very fine and fine interstitial pores; common moderately thick clay films on peds; 10 percent obsidian fragments 2 to 15 mm in diameter; neutral (pH 7.0); abrupt wavy boundary. (6 to 15 inches thick)
Bt1--15 to 25 inches; reddish yellow (5YR 6/6) gravelly clay, yellowish red (5YR 4/6) moist; moderate fine and medium angular blocky structure; very hard, friable, strongly smeary, sticky and plastic; few fine roots; common very fine and fine interstitial pores; common moderately thick clay films on peds; 15 percent obsidian fragments 2 to 15 mm in diameter; neutral (pH 7.0); gradual wavy boundary (10 to 20 inches thick)
Bt2--25 to 40 inches; reddish yellow (5YR 6/6) gravelly clay, yellowish red (5YR 4/6) moist; moderate fine and medium angular blocky structure; very hard, friable, strongly smeary, very sticky and plastic; few fine roots; common very fine and fine interstitial pores; common moderately thick clay films on peds; 15 percent obsidian fragments 2 to 15 mm in diameter; neutral (pH 7.0); gradual wavy boundary. (15 to 25 inches thick)
Bt3--40 to 65 inches; reddish yellow (5YR 6/6) gravelly clay loam, yellowish red (5YR 5/6) moist; weak fine and medium angular blocky structure; very hard, friable, strongly smeary, very sticky and very plastic; few fine roots; common very fine and fine interstitial pores; common moderately thick clay films on peds; 20 percent obsidian fragments 2 to 25 mm in diameter; neutral (pH 7.0).
TYPE LOCATION: Lake County, California; about 7 miles southeast of Kelseyville, about 10 feet south of road at a point 1,350 feet north and 30 feet west of the southeast corner of sec. 3, T. 12 N., R. 8 W.
RANGE IN CHARACTERISTICS: The thickness of the solum and depth to a lithic contact is greater than 60 inches. Mean annual soil temperature is 54 to 59 degrees F. The soil between the depths of 8 to 22 inches is dry in all parts from June 15 to October 15 and moist in all parts from January 1 to April 30 in 6 or more years out of 10. Mineralogy is halloysitic and is strongly influenced by amourphous properties. Base saturation is 40 to 70 percent (sum of cations) throughout. Reaction is medium acid through neutral throughout.
The A horizon is 5YR 6/3, 6/4, 6/6; 7.5YR 5/2, 5/4; 10YR 5/3 or 5/4. Moist color is 5YR 4/3, 4/4; 7.5YR 3/4, 4/4; or 10YR 3/4. It is very gravelly loam occurring as a surface pavement in the upper A horizon. The lower A horizon is gravelly loam. Gravel content is 40 to 90 percent at the surface and 15 to 35 percent in the lower A horizon.
The Bt horizon is 5YR 5/6, 6/4, 6/6; 7.5YR 5/6 or 6/6. Moist color is 5YR 4/4, 4/6, 5/6; 7.5YR 4/6, 5/4, or 5/6. It is gravelly clay loam, gravelly clay, clay loam or clay. Gravel content is 5 to 35 percent. Coarse and very coarse sand is 5 to 20 percent. Clay content is 30 to 50 percent, and the weighted average in the upper 20 inches of the argillic horizon is 35 to 50 percent. Clay content does not decrease more than 20 percent from its maximum within a depth of 60 inches.
COMPETING SERIES: These are the Bottlerock, Cotati, and Spreckles (T) series in another family. Bottlerock soils are loamy-skeletal and have mixed mineralogy. Cotati and Spreckles soils have mixed mineralogy.
GEOGRAPHIC SETTING: Glenview soils are on hills with slopes of 2 to 50 percent. They formed in material derived from obsidian and pyroclastic materials. Elevation is 1,500 to 3,000 feet. The climate is subhumid with cool, moist winters and warm, dry summers. Mean January temperature is 41 degrees F; mean July temperature is 68 degrees F; mean annual temperature is 53 degrees to 59 degrees F. Mean annual precipitation is 30 to 50 inches. Frost-free season is 150 to 195 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Bottlerock soils and the Arrowhead, Benridge, and Konocti soils. Arrowhead soils are 20 to 40 inches to a lithic contact and are clayey-skeletal. Benridge soils lack obsidian fragments and have a thermic soil temperature. Konocti soils are 20 to 40 inches to a lithic contact and are loamy-skeletal.
DRAINAGE AND PERMEABILITY: Well drained; slow to rapid runoff; moderately slow permeability.
USE AND VEGETATION: This soil is used mainly for cropland producing walnuts, timber production, watershed and wildlife habitat. Native vegetation is California black oak, canyon live oak, ponderosa pine, Douglas-fir, poisonoak, manzanita, scrub interior live oak and deerbrush.
DISTRIBUTION AND EXTENT: Obsidian flows in the Clear Lake volcanic field in Lake County, California. The soils are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Lake County, California, 1983.
REMARKS: This is a classification change from fine-loamy, mixed, mesic Ultic Haploxeralfs to fine, halloysitic, mesic Ultic Palexeralfs. Originally classification was based on field estimation; NSSL data (sample numbers 82P1848-1852) supports proposed change.
OSED scanned by SSQA. Last revised by state on 3/84.