LOCATION MISLATNAH OREstablished Series
TAXONOMIC CLASS: Loamy-skeletal, magnesic, mesic Dystric Eutrudepts
TYPICAL PEDON: Mislatnah cobbly clay loam, woodland. On a 30 percent northwest-facing slope at an elevation of 1,800 feet. (When described on September 30, 1988, the soil profile was moist to a depth of 19 inches and dry below this depth. Colors are for moist soil unless otherwise noted.)
Oi--0 to 1 inch; slightly decomposed needles, leaves, twigs, and woody materials.
A--1 to 3 inches; dark reddish brown (5YR 3/3) cobbly clay loam, dark reddish brown (5YR 3/4) dry; moderate very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic, weakly smeary; many very fine and fine, and few medium and coarse roots; many fine and very fine continuous tubular pores; 10 percent gravel and 10 percent cobbles; moderately acid (pH 6.0); clear smooth boundary. (2 to 4 inches thick)
BA--3 to 9 inches; dark reddish brown (5YR 3/4) cobbly clay loam, yellowish red (5YR 4/6) dry; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic, weakly smeary; many fine and very fine, and few medium and coarse roots; many fine and very fine continuous tubular pores; 15 percent gravel, 10 percent cobbles, and 25 percent soft rock fragments; moderately acid (pH 6.0); clear smooth boundary. (0 to 6 inches thick)
Bw1--9 to 20 inches; dark reddish brown (5YR 3/4) cobbly clay loam, strong brown (7.5YR 4/6) dry; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic, weakly smeary; many fine and very fine, and few medium and coarse roots; many fine and very fine continuous tubular pores; 15 percent gravel, 10 percent cobbles, and 25 percent soft rock fragments; slightly acid (pH 6.2); gradual smooth boundary.
Bw2--20 to 29 inches; reddish brown (5YR 4/3) very cobbly clay loam, strong brown (7.5YR 5/6) dry; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine, and few medium and coarse roots; many very fine and fine continuous tubular pores; 20 percent gravel, 25 percent cobbles, and 15 percent soft rock fragments; slightly acid (pH 6.2); abrupt wavy boundary.
Bw3--29 to 39 inches; brown (7.5YR 4/4) very cobbly clay loam, strong brown (7.5YR 5/6) dry; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few medium and coarse roots; many fine and very fine continuous tubular pores; 20 percent gravel, 30 percent cobbles, and 15 percent soft rock fragments, slightly acid (pH 6.2); abrupt wavy boundary. (Combined thickness of the Bw horizon is 15 to 30 inches)
R--39 inches; highly fractured reddish-black peridotite and greenish-black serpentine.
TYPE LOCATION: Curry County, Oregon; located about 2,475 feet north and 250 feet west of the southeast corner of section 13, T. 37 S., R. 14 W. (Latitude 42 degrees, 22 minutes, 27 seconds N.; Longitude 124 degrees, 17 minutes, 59 seconds W.)
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 47 to 54 degrees F. The soils are usually moist and are dry for less than 45 consecutive days in all parts between depths of 4 and 12 inches in the four months following the summer solstice. The particle-size control section averages 27 to 35 percent clay and 40 to 75 percent rock fragments. Depth to bedrock is 20 to 40 inches. The solum is moderately acid to neutral throughout. Hue is 5YR or 7.5YR.
The A horizon has value of 2 or 3 moist, 3 or 4 dry and chroma of 3 moist and 4 to 6 dry. It is cobbly clay loam with 27 to 30 percent clay. It has 0 to 10 percent gravel and 5 to 10 percent cobbles.
The BA horizon has value of 3 or 4 moist, 4 to 6 dry and chroma of 3 or 4 moist and 4 to 6 dry. It is cobbly clay loam or very cobbly clay loam with 27 to 30 percent clay. It has 5 to 35 percent gravel, 10 to 20 percent cobbles, and 10 to 30 percent soft rock fragments.
The Bw horizon has value of 3 or 4 moist, 4 to 6 dry and chroma of 3 or 4 moist and 4 to 6 dry. The upper part of the Bw horizon is cobbly clay loam with 5 to 35 percent gravel and 10 to 20 percent cobbles. The lower part is very cobbly clay loam or extremely cobbly clay loam with 20 to 45 percent gravel and 25 to 30 percent cobbles. The Bw horizon has 27 to 35 percent clay and 10 to 30 percent soft rock fragments.
COMPETING SERIES: This is the Serpentano series which is 40 to 60 inches deep to bedrock.
GEOGRAPHIC SETTING: Mislatnah soils are on metastable broad ridgetops and active side slopes of mountains. Slopes are 0 to 90 percent. The soils formed in colluvium and residuum derived from serpentinized peridotite or other serpentinized rock types. Elevations are 400 to 3,000 feet. The climate is characterized by warm wet winters and hot moist summers. The mean annual precipitation is 90 to 130 inches. The mean annual temperature is 45 to 53 degrees F. The frost-free period is 120 to 210 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Greggo, Redflat, and Serpentano soils. All these soils are on broad ridgetops and side slopes of mountains. Greggo soils are 10 to 20 inches deep to bedrock and are loamy-skeletal. Redflat soils are over 60 inches deep to bedrock and are fine-loamy. Serpentano soils are 40 to 60 inches deep to bedrock.
DRAINAGE AND PERMEABILITY: Well drained; moderately slow permeability.
USE AND VEGETATION: These soils are used mainly for watershed, recreation, woodland, and wildlife habitat. The native vegetation is knobcone pine, Jeffrey pine, lodgepole pine, incense cedar, western white pine, Douglas fir, California laurel, tanoak, California buckthorn, huckleberry oak, whiteleaf manzanita, pinemat manzanita, evergreen huckleberry, red huckleberry, and common beargrass.
DISTRIBUTION AND EXTENT: Mountainous areas of southwestern Oregon; MLRA 1. The series is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Curry County, Oregon, 1995.
REMARKS: Diagnostic horizons and other features:
Ochric epipedon
Cambic horizon - from 8 to 38 inches (Bw1, Bw2, and Bw3 horizons).
Particle-size control section - from 10 to 38 inches (lower Bw1 horizon and the Bw2 and Bw3 horizons) weighted average of 40 percent rock fragments.
Eutrochrepts great group - base saturation by ammonium acetate is assumed to be 60 percent or more in some subhorizon between depths of 10 and 30 inches below the soil surface. This is based on laboratory data from the associated Redflat soil.
All depths to diagnostic horizons and features are measured from the to of the first mineral horizon.