LOCATION DOYN                    OR

Established Series
Rev. EGH/TDT
11/2010

DOYN SERIES

The Doyn series consists of very shallow, well drained soils that formed in residuum from basalt, rhyolite and andesite. They are on hills and tablelands. Slopes are 2 to 30 percent. The mean annual precipitation is about 13 inches and the mean annual temperature is about 44 degrees F.

TAXONOMIC CLASS: Loamy, mixed, superactive, frigid Aridic Lithic Haploxerolls

TYPICAL PEDON: Doyn very stony loam, rangeland. (Colors are for dry conditions unless otherwise noted.)

A1--0 to 2 inches; brown (10YR 5/3) very stony loam, dark brown (10YR 3/3) moist; moderate medium platy structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine roots; common very fine vesicular pores; 10 percent gravel, 20 percent cobbles and 15 percent stones: slightly alkaline (pH 7.8); clear smooth boundary. (1 to 3 inches thick.)

A2--2 to 8 inches; brown (10YR 5/3) cobbly loam, dark brown (10YR 3/3) moist; weak medium platy structure parting to moderate fine and medium subangular blocky; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine, and few medium roots; common very fine and fine irregular pores; 10 percent gravel and 10 percent cobbles; slightly alkaline (pH 7.8); abrupt smooth boundary. (2 to 8 inches thick.)

R--8 inches; basalt.

TYPE LOCATION: Harney County, Oregon; about 2,000 feet north and 400 feet west of the southeast corner of section 21, T. 22 S., R. 34 E., on the Stinkingwater Pass quadrangle.

RANGE IN CHARACTERISTICS: The soils are dry for one-half to three-fourths of the time when the soil temperature is greater than 41 degrees F. The mean annual soil temperature is 45 to 47 degrees F. Depth to bedrock is 4 to 10 inches. The particle-size control section averages 10 to 35 percent rock fragments and 18 to 30 percent clay.

The A horizon has value of 4 or 5 dry, 3 moist and chroma of 2 or 3 moist and dry. It is sandy clay loam, loam or clay loam. The upper part contains 10 to 50 percent rock fragments and is neutral or slightly alkaline. The lower part is slightly or moderately alkaline and contains 5 to 35 percent rock fragments.

COMPETING SERIES: These are the Choptie, Nuss, Quicksilver, Sadorus and Spaa series. All of these soils have bedrock at 10 to 20 inches.

GEOGRAPHIC SETTING: The soils occur on hills and tablelands at elevations of 3,900 to 6,200 feet. The soils formed in residuum and colluvium from basalt, andesite or rhyolite. Slopes are 2 to 30 percent. The climate is semiarid and summers are dry. The mean annual precipitation is 10 to 16 inches and the mean annual temperature is 43 to 45 degrees F. The frost-free period is 50 to 80 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are Arcia, Lonely, and Merlin soils. Arcia are 20 to 40 inches to bedrock and are in the fine family. Lonely soils are 20 to 40 inches deep to bedrock and have an ochric epipedon. Merlin soils are clayey with an argillic horizon.

DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderate permeability.

USE AND VEGETATION: The soils are used for limited livestock grazing and wildlife habitat. The potential native vegetation is stiff sagebrush. Thurber needlegrass, bluebunch wheatgrass, and Sandberg bluegrass.

DISTRIBUTION AND EXTENT: South-central Oregon; MLRA 10 and 23. The series is minor in extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Harney County, Oregon, 1997.

REMARKS: Diagnostic horizons and features recognized in this pedon are:

- Mollic epipedon - 0 to 8 inches

- Particle-size control section - 0 to 8 inches; averages 26 percent rock fragments and 23 percent clay

- Aridic bordering on xeric soil moisture regime

- Lithic contact at 8 inches

- The series was proposed in 1967 with the type location in Lake County Oregon. Areas mapped as Doyn in Lake County are now mapped as Fitzwater soils. The type location was moved in 1996, no change in classification

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National Cooperative Soil Survey
U.S.A.