LOCATION LEOPOLD OREstablished Series
TAXONOMIC CLASS: Fine-loamy, isotic, frigid Andic Dystrudepts
TYPICAL PEDON: Leopold clay loam-forested, on a northeast-facing slope of 10 percent at an elevation of 2360 feet. (Colors are for moist soil unless otherwise stated.)
Oi--0 to 1 inch; partially decomposed and burned fir needles, twigs, leaves and branches.
A--1 to 6 inches; dark brown (7.5YR 3/4) clay loam, brown (7.5YR 4/4) dry; moderate fine and medium granular structure; slightly hard, friable, moderately sticky and slightly plastic; many very fine, fine and medium and few coarse roots; many very fine and fine irregular pores; 10 percent gravel; very strongly acid (pH 5.0); clear smooth boundary. (4 to 10 inches thick)
Bw1--6 to 21 inches; brown (7.5YR 4/4) gravelly silty clay loam, yellowish brown (10YR 5/4) dry; moderate fine and medium subangular blocky structure; hard, friable, moderately sticky and moderately plastic; common fine and medium and few coarse roots; common very fine and fine irregular pores; 15 percent gravel and 5 percent cobbles; very strongly acid (pH 4.8); clear smooth boundary.
Bw2--21 to 25 inches; brown (7.5YR 4/4) very gravelly silty clay loam, light yellowish brown (10YR 6/4) dry; weak medium and coarse subangular blocky structure; hard, firm, moderately sticky and moderately plastic; few fine and medium roots; common fine irregular and tubular pores; 30 percent gravel and 10 percent cobbles; very strongly acid (pH 4.6); abrupt wavy boundary. (combined thickness of the Bw horizon is 10 to 30 inches thick)
R----25 inches; sandstone.
TYPE LOCATION: Douglas County, Oregon, 1/2 mile east of Baldy Mountain, 2475 feet west and 500 feet north of the southeast corner of section 17, T. 19 S., R. 9 W. W.M. (Latitude 43 degrees, 54 minutes, 57 seconds N, Longitude 123 degrees, 47 minutes, 49 seconds W)
RANGE IN CHARACTERISTICS: Solum thickness and depth to bedrock is 20 to 40 inches. The mean annual soil temperature is 42 to 47 degrees F. The soil is usually moist but is dry within all parts of the moisture control section for less than 45 consecutive days following the summer solstice. The particle-size control section has 27 to 35 percent clay, and averages 15 to 35 percent rock fragments. Hue is 10YR or 7.5YR.
The A horizon has value of 2 or 3 moist, 3 or 4 dry, and chroma of 3 or 4 moist and dry. It has 0 to 15 percent gravel. It is very strongly acid or strongly acid.
The Bw horizon has value of 3 or 4 moist, 5 or 6 dry, and chroma of 3 or 4 moist and dry. The upper part is gravelly silty clay loam or gravelly clay loam. The lower part is very gravelly silty clay loam and is absent in many pedons. The upper part has 10 to 20 percent gravel and 5 to 15 percent cobbles. The upper lower has 25 to 35 percent gravel and 10 to 20 percent cobbles.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Leopold soils are on benches and mountain sideslopes. They formed in colluvium and residuum derived from sandstone. Slopes are 3 to 60 percent. Elevations are 1750 to 2550 feet. The climate is characterized by cool, wet winters and warm, moist summers. The mean annual temperature is 42 to 45 degrees F, and the mean annual precipitation is 80 to 120 inches. The frost free period is 100 to 145 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Laderly and Romanose soils. Laderly soils are loamy-skeletal. Romanose soils are shallow.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability.
USE AND VEGETATION: Leopold soils are used for timber production and wildlife habitat. Native vegetation includes Douglas fir and western hemlock with an understory of cascade Oregongrape, red huckleberry, salal, vine maple, western swordfern, big huckleberry, Pacific trillium, and Oregon oxalis.
DISTRIBUTION AND EXTENT: Coast Range of Oregon, MLRA 1. The series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Douglas County, Oregon, 1994.
REMARKS: Diagnostic horizons and features recognized in this pedon include:
Ochric epipedon
Cambic horizon - from 6 to 25 inches. (Bw1 and Bw2 horizons)
All depths to diagnostic horizons and features are measured from the top of the first mineral horizon.
Particle-size control section - from 11 to 25 inches averages 29 percent rock fragments.
Base saturation is assumed to be less than 50 percent throughout the soil profile.