LOCATION LEGALL WAEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic Ultic Argixerolls
TYPICAL PEDON: Legall cobbly loam - forested on a 25 percent southwest-facing side slope at an elevation of 800 feet. (Colors are for dry soils unless otherwise noted.)
A1--0 to 8 inches; brown (7.5YR 5/3) cobbly loam, dark brown (7.5YR 3/2) moist; moderate fine subangular blocky structure; soft, friable, nonsticky and nonplastic; common very fine and fine roots; many fine irregular pores; 15 percent gravel and 15 percent cobbles; moderately acid (pH 5.8); clear wavy boundary. (6 to 8 inches thick)
A2--8 to 18 inches; brown (7.5YR 5/3) very cobbly loam, dark brown (7.5YR 3/2) moist; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine, and common medium and coarse roots; common fine tubular pores; 15 percent gravel and 25 percent cobbles; moderately acid (pH 6.0); gradual irregular boundary. (7 to 11 inches thick)
Bt1--18 to 40 inches; brown (7.5YR 5/4) very cobbly clay loam, dark brown (7.5YR 3/4) moist; moderate medium subangular blocky structure; hard, firm, slightly sticky and moderately plastic; common fine, and medium roots; common fine tubular pores; common distinct clay films on faces of peds; 20 percent gravel and 30 percent cobbles; slightly acid (pH 6.2); gradual wavy boundary. (20 to 24 inches thick)
Bt2--40 to 60 inches; light brown (7.5YR 6/4) very cobbly clay loam, brown (7.5YR 4/4) moist; moderate medium subangular blocky structure; slightly hard, firm, moderately sticky and moderately plastic; few fine and medium roots; few fine tubular pores; common distinct clay films on faces of peds; 15 percent gravel and 40 percent cobbles; slightly acid (pH 6.4)
TYPE LOCATION: Klickitat County, Washington; 4 miles north of Wahkiacus about 100 feet north and 1,600 feet east of the southwest corner of section 30, T. 5 N., R. 14 E.; Latitude 45 degrees, 53 minutes, 06 seconds N. and Longitude 121 degrees, 53 minutes, 06 minutes, and 24 seconds W.
RANGE IN CHARACTERISTICS: These soils are usually moist but are dry in the moisture control section for 75 to 90 consecutive days following solstice. The mean annual soil temperature is 50 to 53 degrees F. The particle-size control section ranges from 35 to 65 percent rock fragments on a weighted average. The mollic epipedon is 15 to 20 inches thick. The particle-size control section ranges from 18 to 35 percent clay.
The A horizon has hue of 7.5YR or 10YR, value of 4 or 5 dry, 2 or 3 moist and chroma of 2 or 3 dry and moist. Reaction is moderately acid or slightly acid.
The Bt horizon has hue of 7.5YR or 10YR and value of 5 or 6 dry, 3 or 4 moist. Texture is very cobbly loam or very cobbly clay loam. Reaction is moderately acid or slightly acid.
COMPETING SERIES: These are the
Balake,
Beezee,
Bluenose,
Bluesprin,
Fordice,
Hunsinger,
Jebe,
Jellico,
Keuterville,
Nashmead,
Riverpoint,
Sauter,
Shanks (T), and
Sienna series.
Balake soils dry for 60 to 75 consecutive days following the summer solstice; mollic epipedon 10 to 15 inches thick; particle-size control section has 35 to 55 percent rock fragments of conglomerate origin
Beezee soils dry for 60 to 75 consecutive days following the summer solstice; particle-size control section with 20 to 40 percent parafragments
Bluenose soils - dry for greater than 90 consecutive days following the summer solstice; particle-size control section has 35 to 60 percent rock fragments of sandstone and shale origin
Bluesprin soils 20 to 40 inches to a lithic contact (basalt)
Fordice soils mean annual soil temperature of 52 to 57 degrees F.; particle-size control section has 20 to 50 percent subrounded and rounded gravel and 20 to 40 percent rounded and subrounded cobbles of mixed alluvial origin.
Hunsinger soils 40 to 60 inches to a paralithic contact (weathered basalt); dry for greater than 90 consecutive days following the summer solstice
Jebe soils - dry for 45 to 60 consecutive days following the summer solstice; mollic epipedon 10 to 16 inches thick
Jellico soils 20 to 40 inches to a lithic contact (basalt); dry for 110 to 130 consecutive days following the summer solstice
Kueterville soils dry for 45 to 60 consecutive days following the summer solstice
Nashmead soils 40 to 60 inches to a lithic contact (sandstone); dry for greater than 90 consecutive days following the summer solstice mean annual soil temperature of 54 to 59 degrees F.
Riverpoint soils mollic epipedon 10 to 15 inches thick; a mean annual soil temperature of 47 to 50 degrees F.; depth to base of argillic horizon is 25 to 45 inches
Sauter soils dry for 60 to 75 consecutive days following the summer solstice; a mean annual soil temperature of 47 to 50 degrees F.
Shanks soils 20 to 40 inches to a lithic contact (granodiorite); mollic epipedon 10 to 14 inches thick
Sienna soils 20 to 40 inches to a lithic contact (basalt); particle-size control section has 35 to 60 percent rounded quartzitic rock fragments (Ellensburg formation)
GEOGRAPHIC SETTING: Legall soils are on south-facing canyon side slopes and hill slopes at elevations of 200 to 3,500 feet. Slopes are 5 to 75 percent. They formed in colluvium derived from basalt mixed with loess. Summers are warm and dry; winters are cool and moist. The mean annual precipitation is 18 to 25 inches. The average January temperature is 30 degrees F. and the average July temperature is 68 degrees F. The mean annual temperature is 48 to 52 degrees F. The frost-free season is 110 to 150 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Dillcourt, Gunn, Leidl, Oreoke, and Sauter soils. Dillcourt and Oreoke soils are pachic and are on canyon side slopes. Gunn soils lack a mollic epipedon and are on hillslopes and plateaus. Leidl soils are moderately deep, have an ash influence in the surface and are on canyon side slopes.
DRAINAGE AND PERMEABILITY: Well drained; medium to rapid runoff; moderate permeability.
USE AND VEGETATION: These soils are used mainly for grazable woodland, wildlife habitat and recreation. Native vegetation is ponderosa pine, Oregon white oak, and scattered Douglas-fir with an understory of deerbrush ceanothus, western hazel, common snowberry, rose, and elk sedge.
DISTRIBUTION AND EXTENT: Klickitat County, Washington; MLRA 6. The series if of small extent.
MLRA OFFICE RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Klickitat County, Washington, 2003. The name is coined.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from 0 to 18 inches
Argillic horizon - the zone from 18 to 60 inches
Particle-size control section - the zone from 18 to 38 inches