LOCATION SUILOTEM OREstablished Series
TAXONOMIC CLASS: Ashy, glassy, frigid Aquic Vitrixerands
TYPICAL PEDON: Suilotem ashy sandy loam - woodland, on a 2 percent slope at 2980 feet elevation. (When described (6-27-84), the soil was moist throughout. Colors are for moist soil unless otherwise noted.)
Oi--0 to 1 inches; slightly decomposed litter of ponderosa pine and western larch needles and mixed grasses.
A1--1 to 6 inches; dark brown (10YR 3/3) ashy sandy loam, dark grayish brown (10YR 4/2) dry; moderate very fine granular structure; slightly hard, friable, nonsticky and slightly plastic; many very fine, fine, and medium roots; many fine irregular pores; 10 percent pumice (2 to 5 millimeters); neutral (pH 6.6); clear wavy boundary.
A2--6 to 17 inches; dark brown (10YR 3/3) ashy sandy loam, yellowish brown (10YR 5/4) dry; moderate very fine granular structure; slightly hard, friable, nonsticky and nonplastic; common very fine, medium, and coarse roots; many fine irregular pores; 15 percent pumice (2 to 5 millimeters); neutral (pH 6.8); clear wavy boundary. (Combined thickness of the A horizon is 10 to 20 inches)
C1--17 to 28 inches; dark brown (10YR 3/3) ashy sandy loam, yellowish brown (10YR 5/4) dry; massive; slightly hard, friable, nonsticky and nonplastic; few very fine, medium, and coarse roots; many very fine irregular pores; 10 percent pumice (2 to 5 millimeters); neutral (pH 6.8); clear irregular boundary. (8 to 14 inches thick)
2C2--28 to 31 inches; very dark brown (10YR 2/2) ashy fine sandy loam, light gray (10YR 7/2) dry; massive; slightly hard, friable, nonsticky and nonplastic; few very fine, medium, and coarse roots; many very fine irregular pores; 10 percent pumice (2 to 5 millimeters); 5 percent rounded gravel; neutral (pH 7.0); abrupt broken boundary.
2C3--31 to 52 inches; black (10YR 2/1) ashy loamy fine sand, dark gray (10YR 4/1) dry; common medium to large prominent strong brown (7.5YR 4/6) redox concentrations; massive; slightly hard, friable, nonsticky and nonplastic; few very fine and medium roots; common fine tubular pores; 10 percent rounded gravel; neutral (pH 7.0); abrupt irregular boundary. (Combined thickness of the 2C horizon is 20 to 29 inches)
3Bwb--52 to 65 inches; dark brown (7.5YR 3/2) ashy very fine sandy loam, pale brown (10YR 6/3) dry; common medium distinct brown (7.5YR 4/4) redox concentrations; strong fine and medium subangular blocky structure; slightly hard, friable, nonsticky and slightly plastic; common medium and coarse roots; common fine tubular pores; common medium iron concretions; 5 percent rounded gravel; neutral (pH 7.0).
TYPE LOCATION: Jefferson County, Oregon; about 150 feet north of Forest Service road 1216 northeast of intersection of Forest Service roads 1216 and 1419; northeast quarter of section 9, T. 13 S., R. 9 E. (Latitude 44 degrees, 27 minutes, 36 seconds N, Longitude 121 degrees, 39 minutes, 14 seconds W)
RANGE IN CHARACTERISTICS: The soil moisture control section is usually moist but is dry in all parts for 60 to 90 consecutive days after the summer solstice. The mean annual soil temperature is 42 to 47 degrees F. Depth to glacial outwash material is 40 to over 60 inches and depth to bedrock is greater than 60 inches. Depth to redox concentrations is 30 to 40 inches. The umbric epipedon is 10 to 20 inches thick. The ash mantle (A, C, 2C horizons) contains 50 to 70 percent glass and glass-coated aggregate, phosphate retention of 75 to 85 percent, acid oxalate aluminum plus one-half the acid oxalate iron is 1.5 to 2.5 percent, and the 15-bar water content on dried and undried samples is 5 to 12 percent.
The Oi horizon is 1 to 3 inches thick except where disturbed.
The A and C horizon has hue of 10YR moist and dry, value of 2 or 3 moist, 4 or 5 dry, and chroma of 2 or 3 moist and 2 through 4 dry. It contains 5 to 15 percent pumice gravel. It is slightly acid or neutral. Base saturation by ammonium acetate is 40 to 50 percent.
The 2C horizon has hue of 10YR, value of 2 or 3 moist, 4 through 7 dry and chroma of 1 through 3 moist, 1 through 4 dry. It is fine sandy loam, loamy fine sand, or sandy loam. It has 5 to 15 percent gravel. It has common to many prominent mottles.
The 3B horizon has hue of 7.5YR or 10YR moist and dry, value of 2 or 3 moist, 5 or 6 dry, chroma of 2 moist, and 3 or 4 dry. It is very fine sandy loam or sandy loam. It contains 5 to 10 percent gravel and 0 to 5 percent cobbles. Total rock fragment content ranges from 5 to 10 percent. It has common to many distinct to prominent redox concentrations.
COMPETING SERIES: This is the Wizard Series. Wizard soils have glacial outwash material at 20 to 40 inches.
GEOGRAPHIC SETTING: The Suilotem soils are on glacial outwash plains at elevations of 2,500 to 3,500 feet. Slopes are 0 to 8 percent. The soil formed in stratified tephra over mixed glacial outwash material. The climate is characterized by cold, wet winters and hot, dry summers. The mean annual precipitation is 20 to 30 inches. The mean annual temperature is 40 to 47 degrees F. The frost-free period is 50 to 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Allingham, Circle, Suttle and the competing Wizard soils. These soils are on glacial outwash plains and are well drained except for Wizard.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; moderately rapid permeability. These soils have a high water table at 0 to 2 feet from April through June.
USE AND VEGETATION: These soils are used for timber production, wildlife habitat, and recreation. Potential native vegetation is ponderosa pine, white fir, snowberry, and twinflower.
DISTRIBUTION AND EXTENT: East slope of the Cascades in Central Oregon; MLRA 6. The series is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Jefferson County (Upper Deschutes River Area), Oregon, 1992.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
umbric epipedon - from the mineral soil surface to 16 inches (A1 and A2 horizon).
Andic soil properties - based on laboratory data from the associated Allingham Series.
Aquic subgroup - the zone from 31 to over 60 inches contain over two percent redox concentrations and has aquic soil conditions.