LOCATION TANDY OR+CAEstablished Series
TAXONOMIC CLASS: Sandy over loamy, mixed, superactive, calcareous, mesic Aeric Fluvaquents
TYPICAL PEDON: Tandy loamy fine sand, range. (Colors are for moist soil unless otherwise noted.)
Ak--0 to 9 inches; dark grayish brown (2.5Y 4/2) loamy fine sand, gray (2.5Y 6/1) dry; single grain; loose; nonsticky and nonplastic; common very fine roots; many very fine pores; strongly effervescent; about 25 percent small mollusk shell fragments; moderately alkaline (pH 8.0); clear smooth boundary. (3 to 10 inches thick)
Ck1--9 to 12 inches; gray (2.5Y 5/1) fine sandy loam, gray (10YR 6/1) dry; massive; soft, very friable, slightly sticky and slightly plastic; few very fine roots; many very fine tubular pores; strongly effervescent; moderately alkaline (pH 8.0); clear smooth boundary. (2 to 6 inches thick)
Ck2--12 to 34 inches; very dark grayish brown (2.5Y 3/2) loamy fine sand, light brownish gray (10YR 6/2) dry; massive; very soft, very friable, nonsticky and nonplastic; few very fine roots; common very fine tubular pores; strongly effervescent; moderately alkaline (pH 8.1); abrupt smooth boundary. (15 to 24 inches thick)
2Akb---34 to 40 inches; black (10YR 2/1) silt loam, gray (10YR 5/1) dry; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots; common very fine tubular pores; strongly effervescent; moderately alkaline (pH 8.2).
2Ck3--40 to 60 inches; stratified clay loam to loamy fine sand; massive; strongly effervescent; moderately alkaline (pH 8.2).
TYPE LOCATION: Lake County, Oregon; about 6 miles south of Lakeview near Goose Lake; near the center of the SW1/4 SW1/4 section 15, T. 40 S., R. 20 E.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 47 to 49 degrees F. The soils are saturated below depth of 20 inches and are moist throughout at depths below 12 inches in the spring and most of the summer. Depth to the 2A horizon is 20 to 40 inches. The upper sandy mantle has 0 to 15 percent gravel and up to 30 percent mollusk shell fragments. It is moderately or strongly alkaline throughout. The sandy mantle lacks mottles and the dominant matrix chroma is 2 when moist.
The Ak horizon has hue of 10YR or 2.5Y, and chroma of 1 or 2 moist and dry, with the dominant chroma being 2.
The Ck horizon has hue of 10YR or 2.5Y, value of 3 to 5 moist, 5 to 7 dry, and chroma of 1 or 2 moist and dry. It is fine sandy loam and loamy fine sand and average 5 to 15 percent clay and more than 75 percent sand.
The 2A horizon has hue of 10YR or neutral, value of 2 or 3 moist, 4 or 5 dry, and chroma of 0 or 1 moist and dry. It has 5 to 12 percent organic matter.
The 2C horizon has texture that ranges mainly from silt loam to clay loam, but contains strata of fine sandy loam and loamy fine sand.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Tandy soils are on hummocky to smooth beach and shore deposits slightly above lake water level at elevations of 4,650 to 4,725 feet. They have 0 to 2 percent slopes. The soils formed in wind and water deposited sandy and loamy sediments overlying silty lacustrine sediments. The sediments are weathered from tuff, felsite, and basalt. The mean annual precipitation is 12 to 16 inches. The mean July temperature is 65 to 68 degrees F., the mean January temperature is 27 to 29 degrees F., and the mean annual temperature is 45 to 47 degrees F. The frost-free period is about 50 to 80 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Goose Lake, Ozamis, and Scherrard soils. These soils have a mollic epipedon. Goose Lake soils also have an albic horizon and clayey Bt horizon. Ozamis soils average more than 18 percent clay in the control section. Scherrard soils have a natric horizon and a duripan.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; moderately rapid permeability in the upper part and moderately slow in the lower part. A water table fluctuates with lake water levels of Goose Lake and commonly is at depths of 0.5 feet above the surface to 3 feet below the surface.
USE AND VEGETATION: Livestock grazing and wildlife habitat. Native plants are mainly inland saltgrass, and Nuttal alkaligrass,.
DISTRIBUTION AND EXTENT: South-central Oregon and northeastern California; MLRA 21. The series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Modoc County (Alturas Area), California; 1974.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon:
Fluvents: Irregular decrease in organic matter.
Udifluvents: portions of the soil moisture control section are moist most of the year due to a water table near the surface.
Aquic subgroup: the soil is saturated between 20 to 40 inches most of the year and the 2Ab horizon has chroma moist of 1 but ranges to 0.
The dominant matrix color (moist chroma) of the upper 20 inches is 2.