LOCATION DOUTHIT OREstablished Series
TAXONOMIC CLASS: Ashy-skeletal, amorphic Typic Vitricryands
TYPICAL PEDON: Douthit ashy sandy loam - woodland, on a 35 percent convex, northeast facing slope at 4400 feet elevation. (When described (7/25/85), soil was dry throughout. Colors are for moist soil unless otherwise noted.)
Oi--0 to 2 inches; slightly decomposed litter of white fir, leaves and twigs.
A1--2 to 5 inches; very dark grayish brown (10YR 3/2) ashy sandy loam, brown (10YR 4/3) dry; weak fine granular structure; slightly hard, friable, nonsticky and nonplastic; many very fine and common fine and medium roots; many very fine irregular pores; 10 percent gravel, 2 percent cobbles and 2 percent stones; neutral (pH 6.8); gradual wavy boundary.
A2--5 to 14 inches; dark yellowish brown (10YR 3/4) ashy cobbly sandy loam, dark yellowish brown (10YR 4/4) dry; weak fine subangular blockly structure parting to single grain; slightly hard, friable, nonsticky and nonplastic; many very fine and common fine, medium, and coarse roots; many very fine irregular pores; 15 percent gravel, 10 percent cobbles and 5 percent stones; neutral (pH 7.0); gradual irregular boundary. (Combined thickness of the A horizon is 10 to 20 inches)
2C1--14 to 54 inches; dark brown (7.5YR 3/4) extremely stony ashy sandy loam, brown (7.5YR 4/4) dry; single grain; slightly hard, friable, nonsticky and nonplastic; many very fine and common fine, medium, and coarse roots; many very fine irregular pores; 25 percent gravel, 20 percent cobbles and 20 percent stones; neutral (pH 7.0); clear irregular boundary. (10 to 45 inches thick)
2C2--54 to 64 inches; dark yellowish brown (10YR 3/4) extremely stony ashy sandy loam, pale brown (10YR 6/3) dry; single grain; slightly hard, friable, nonsticky and nonplastic; many very fine and common fine, medium and coarse roots; many fine irregular pores; 25 percent gravel, 20 percent cobbles and 20 percent stones; neutral (pH 7.0).
TYPE LOCATION: Jefferson County, Oregon; 1000 feet north and 200 feet east of the southwest corner of section 1, T. 12 S., R. 8 E. (Latitude 44 degrees, 32 minutes, 48 seconds N, Longitude 121 degrees, 43 minutes, 58 seconds W)
RANGE IN CHARACTERISTICS: The soil moisture control section is usually moist, it is dry in all parts or about 30 to 45 consecutive days after the summer solstice. The mean annual soil temperature is 40 to 45 degrees F. The mean summer soil temperature is 42 to 47 degrees F. Depth to bedrock is greater than 60 inches. Field estimated clay content is 5 to 15 percent throughout. Depth to glacial till is 10 to 20 inches. The upper part of the particle size control section contains 50 to 80 percent volcanic glass and glass-coated aggregates and the lower part contains 30 to 60 percent. It is moderately acid to neutral.
The Oi horizon is 1 to 3 inches thick, except where disturbed.
The A horizon has hue of 10YR or 7.5YR, value of 2 or 3 moist, 4 or 5 dry, chroma of 2 or 3 moist in the A1, 3 or 4 moist in the A2, and 3 or 4 dry. It contains 10 to 25 percent gravel, 0 to 15 percent cobbles, and 0 to 10 percent stones. Total rock fragments range from 10 to 40 percent.
The 2C horizon has hue of 10YR or 7.5YR and value of 2 or 3 moist, 4 to 6 dry and chroma of 3 or 4 moist and dry. It is ashy loamy sand or ashy sandy loam. It contains 10 to 30 percent gravel, 15 to 35 percent cobbles, and 10 to 30 percent stones. Total rock fragments range from 40 to 70 percent.
COMPETING SERIES: These are the Goatrock, Haynap, Joebaldy, and Longjohn series. Goatrock soils have an umbric epipedon, are dry for 15 to 25 days and the texture (fine earth) of the ash mantle is silt loam. Joebaldy soils have an umbric epipedon and fragmental material at 20 to 40 inches. Longjohn soils have an umbric epipedon and are strongly or very strongly acid throughout. Haynap soils have rock fragments which are cinders.
GEOGRAPHIC SETTING: The Douthit soils are on glacial moraines at elevations of 3200 to 5200 feet. These soils formed in ash and pumice deposits over glacial till. The climate is characterized by cold, wet winters and cool, moist summers. The mean annual precipitation is 40 to 70 inches, falling mostly as snow. The mean annual temperature is 35 to 44 degrees F. The frost-free period is 10 to 80 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Belrick, Bott, Haynap, Linksterly, and Minkwell soils. The Belrick and Linksterly soils are ashy. Bott soils are on mountains and are ashy over loamy-skeletal. Haynap soils have a cindery mantle. Minkwell soils are ashy over loamy and have a buried argillic horizon above 40 inches.
DRAINAGE AND PERMEABILITY: Well drained; moderately rapid permeability.
USE AND VEGETATION: These soils are used for timber production, wildlife habitat, recreation and watershed. Potential native vegetation is ponderosa pine, Douglasfir, snowbrush ceanothus, snowberry, chinkapin, and pinegrass.
DISTRIBUTION AND EXTENT: East slopes of the Cascades in central Oregon; MLRA 3. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Jefferson County (Upper Deschutes River Area), Oregon, 1992.
REMARKS: Diagnostic horizons and features in the pedon are:
Ochric epipedon
Andic soil properities - the entire profile meets andic soil properities; this is based on laboratory data from the associated Belrick series.
Particle-size control section - the zone from 2 to 42 inches. Throughout this depth the 15-bar water content (dried) is less than 12 percent and glass content is over 30 percent.