LOCATION EGLIRIM OREstablished Series
TAXONOMIC CLASS: Clayey-skeletal, smectitic, mesic Aridic Argixerolls
TYPICAL PEDON: Eglirim very stony loam rangeland. (Colors are for dry soil unless otherwise noted.)
A1--0 to 4 inches; dark grayish brown (10YR 4/2) very stony loam, very dark brown (10YR 2/2) moist; moderate fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine roots; 5 percent gravel, 5 percent cobbles, 30 percent stones, 5 percent boulders; moderately alkaline (pH 8.0); clear wavy boundary. (1 to 10 inches thick)
A2--4 to 16 inches; dark grayish brown (10YR 4/2) very stony loam, very dark brown (10YR 2/2) moist; moderate fine subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; common very fine and fine roots; 10 percent gravel, 10 percent cobbles, 10 percent stones, 5 percent boulders; moderately alkaline (pH 8.0); clear irregular boundary. (0 to 16 inches thick)
2Bt1--16 to 29 inches; dark yellowish brown (10YR 4/4) extremely stony clay, dark yellowish brown (10YR 3/4) moist; moderate medium subangular blocky structure; very hard, very firm, very sticky and plastic; few fine roots; few fine tubular pores; many faint clay films on ped faces and in pores; 25 percent gravel, 15 percent cobbles, 40 percent stones, 5 percent boulders; moderately alkaline (pH 8.2); gradual wavy boundary. (7 to 13 inches thick)
2Bt2--29 to 37 inches; dark yellowish brown (10YR 4/4) extremely stony clay loam, dark yellowish brown (10YR 3/4) moist; moderate fine subangular blocky structure; hard, firm, sticky and slightly plastic; few fine roots; few fine tubular pores; many faint clay films on ped faces and in pores; 25 percent gravel, 15 percent cobbles, 40 percent stones, 5 percent boulders; moderately alkaline (pH 8.2); gradual wavy boundary. (5 to 10 inches thick)
3C--37 to 60 inches; yellowish brown (10YR 5/4) extremely stony loam, dark yellowish brown (10YR 3/4) moist; massive; soft, very friable, slightly sticky and nonplastic; few fine roots; few fine tubular pores; many faint clay films on ped faces and in pores; 25 percent gravel, 15 percent cobbles, 45 percent stones, 5 percent boulders; moderately alkaline (pH 8.2)
TYPE LOCATION: Lake County, Oregon; About 2 miles west of Ana reservoir in the SW1/4, SE1/4, SE1/4 of section 35, T. 29 S., R. 16 E.
RANGE IN CHARACTERISTICS: The soils are dry in all parts of the moisture control section for over half the time (cumulative) when the soil temperature is above 41 degrees F., and are continuously dry for over 90 days following the summer solstice. The mean annual soil temperature is 49 to 52 degrees F. Depth to bedrock is greater than 60 inches. The solum is 20 to 40 inches thick. The mollic epipedon is 10 to 20 inches thick. The particle-size control section has an average of 35 to 50 percent clay and contains 50 to 90 percent rock fragments.
The A horizon has a value of 2 moist, 4 dry and chroma of 2 moist and dry. It has 5 to 15 percent gravel, 5 to 15 percent cobbles and 15 to 40 percent stones.
The 2Bt horizon has a value of 3 moist, 4 or 5 dry and chroma of 4 moist and dry. It is a very stony clay, extremely stony clay or extremely stony clay loam. It has 30 to 50 percent clay and 50 to 90 percent rock fragments. Rock fragments are 15 to 35 percent gravel, 10 to 30 percent cobbles and 25 to 50 percent stones and boulders.
The 3C horizon has a value of 3 moist, 5 or 6 dry and chroma of 4 moist and dry. It is extremely stony loam with 15 to 27 percent clay. It has 60 to 90 percent rock fragments. It has rock fragment content similar to the 2Bt horizon.
COMPETING SERIES: These are the Cassiro, Hyall, Pickup and Ruclick series. Cassiro soils are neutral to moderately acid, have hue of 7.5YR or 5YR in the Bt, rock fragments are primarily gravel and the Bt horizon is sandy clay. Pickup and Ruclick soils are 20 to 40 inches to bedrock. Hyall soils have a mean annual soil temperature of 47 to 50 degrees F., rock fragments are primarily gravel and cobbles, and are on terrace sideslopes (Eola geomorphic surface).
GEOGRAPHIC SETTING: Eglirim soils are on coalescent fans at elevations of 4,200 to 4,700 feet. Slopes range from 2 to 50 percent. These soils formed in colluvium from tuff and rhyolite. The climate is characterized by cool moist winters and hot dry summers. The mean annual temperature is 52 to 54 degrees F., and the mean annual precipitation is 10 to 14 inches. The frost free period is 70 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bullump, Nuss, Royst and Winterim soils. Bullump soils are loamy-skeletal, frigid and have a mollic epipedon over 20 inches thick. Nuss soils are shallow to bedrock, frigid and loamy. Royst soils are moderately deep to bedrock, frigid and have a mollic epipedon over 20 inches thick. Winterim soils are frigid and have a mollic epipedon over 20 inches thick.
DRAINAGE AND PERMEABILITY: Well drained; rapid to very rapid runoff; slow permeability.
USE AND VEGETATION: Eglirim soils are used for livestock grazing and wildlife habitat. Native vegetation is Wyoming big sagebrush, bluebunch wheatgrass and Idaho fescue.
DISTRIBUTION AND EXTENT: On colluvial fans beneath rimrock in south central Oregon, MLRA 21. The series is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Lake County, Oregon, Southern Part; 1991.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon; 0 to 16 inches
Argillic horizon; 16 to 37 inches
Clayey-skeletal family; clay content is about 41 percent and rock fragments are about 85 percent.