LOCATION LAINAND WAEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic Vitrandic Argixerolls
TYPICAL PEDON: Lainand gravelly ashy loam- rangeland, on a 29 percent northwest-facing slope at 2,900 feet elevation. (Colors are for dry soil unless otherwise stated. All textures are apparent field textures.)
A1--0 to 4 inches; brown (10YR 4/3) gravelly ashy loam, very dark grayish brown (10YR 3/2) moist; weak coarse platy parting to weak medium and fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine and few medium roots; many very fine irregular and tubular pores; 20 percent gravel and 5 percent cobbles; neutral (pH 6.8); clear smooth boundary.
A2--4 to 9 inches; brown (10YR 4/3) very gravelly ashy loam, very dark grayish brown (10YR 3/2) moist; moderate medium and fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine, and few medium roots; many very fine irregular and tubular pores; 35 percent gravel and 15 percent cobbles; neutral (pH 6.8); abrupt wavy boundary. (Combined thickness of the A horizon is 7 to 16 inches)
AB--9 to 22 inches; brown (10YR 4/3) very gravelly ashy loam, very dark grayish brown (10YR 3/2) moist; moderate medium and fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine, and few medium roots; many very fine irregular and tubular pores; 40 percent gravel and 15 percent cobbles; neutral (pH 6.6); clear wavy boundary. (12 to 16 inches thick)
2Bt1--22 to 30 inches; yellowish brown (10YR 5/4) extremely gravelly clay loam, dark brown (7.5YR 3/4) moist; moderate medium and fine subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common very fine and fine roots; common very fine tubular pores; few patchy distinct 5YR 5/8 clay films on the faces of peds, common distinct 7.5YR pressure faces on peds; 50 percent gravel and 15 percent cobbles; slightly acid (pH 6.4); clear wavy boundary.
2Bt2--30 to 43 inches; brown (7.5YR 4/4) extremely cobbly loam, dark brown (7.5YR 3/4) moist; moderate medium and fine subangular blocky structure; hard, firm, slightly sticky and slightly plastic; few very fine roots; common very fine tubular pores; few distinct patchy 5YR 5/8 clay films on the faces of peds; common distinct 7.5YR pressure faces on peds; 40 percent gravel and 45 percent cobbles; slightly acid (pH 6.4); abrupt irregular boundary. (Combined thickness of the 2Bt horizon is 20 to 35 inches.)
3R--43 inches; basalt bedrock.
TYPE LOCATION: Kittitas County, Washington, about 700 feet south, and 2,100 feet east of the NW corner of section 20, T. 16 N., R. 21 E.; USGS McDonald Spring topographic quadrangle; Latitude 46 degrees, 51 minutes, 53 seconds N; Longitude 120 degrees, 13 minutes, 27 seconds W.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 47 to 52 degrees F. These soils are usually moist but are dry in all parts of the moisture control section for 90 to 105 consecutive days following the summer solstice. Thickness of the mollic epipedon is 20 to 29 inches. The upper 20 to 29 inches has estimated moist bulk density of 1.10 to 1.30 g/cc, volcanic glass content of 5 to 20 percent, acid oxalate extractable aluminum plus one-half extractable iron of 0.4 to 0.7 percent, and 15-bar water retention of 5 to 10 percent for air dried samples. The particle-size control section averages 30 to 35 percent clay and 35 to 85 percent coarse fragments with at least 5 percent cobbles. The organic matter is estimated to range from 2 to 4 percent. Depth to extremely gravelly or extremely cobbly 2Bt horizon is 21 to 32 inches. Solum thickness and depth to bedrock is 40 to more than 60 inches.
The A1 and A2 horizons have hue of 7.5YR or 10YR, value of 3 through 5 dry, 2 or 3 moist, and chroma of 1 through 3 moist. The A2 horizon has texture of ashy silt loam, gravelly ashy silt loam, very gravelly ashy loam, ashy loam, or gravelly ashy loam.
The AB horizon has value of 3 through 5 dry, 2 or 3 moist, and chroma of 2 or 3, dry or moist. Texture is very cobbly ashy loam or very gravelly ashy loam or cobbly ashy loam.
The 2Bt horizon has hue of 7.5YR or 10YR, value of 4 through 6 dry, 3 or 4 moist, and chroma of 3 through 4, dry or moist. Texture is extremely gravelly clay loam, very cobbly clay loam, extremely cobbly clay loam, or extremely cobbly clay loam in the upper part and very gravelly clay loam, very gravelly loam, or extremely cobbly loam.
COMPETING SERIES: These are the
Ackna (T),
Blint,
Brysill (T),
Bunselmeier,
Cubhill,
Hehe,
Hovelton,
Leidl,
McDaniel,
Millhouse (T),
Nint (T),
Norod,
Skooker, and Teoka series.
Akna soils have less than 15 percent rock fragments in the upper part of the argillic horizon; 0.25 to 0.4 percent acid oxalate extractable aluminum plus one-half iron, have 25 to 30 percent clay in the particle-size control section
Blint soils are 20 to 40 inches to a lithic contact
Brysill soils are 11 to 18 inches to a 2Bt horizon; have 25 to 30 percent clay in the particle-size control section; have an aridic soil moisture regime
Bunselmeier soils have sandy clay loam textures in the particle-size control section; are 40 to 60 inches to unweathered cinders; have mollic epipedons 10 to 14 inches thick
Cubhill soils have pscs dominated by rounded rock fragments derived from glacial till origin
Hehe soils have 10 to 25 percent medium, coarse, and very coarse sand; are 20 to 40 inches to weathered bedrock are dry for 60 to 90 consecutive days
Hovelton soils 20 to 40 inches to lithic contact; dry for 60 to 90 consecutive days
Leidl soils mollic epipedon 20 to 40 inches thick; have hue of 7.5YR or redder; are 20 to 40 inches to a lithic contact
McDaniel soils are dry for 60 to 90 consecutive days
Millhouse soils have 20 to 25 percent clay in the particle-size control section; are 20 to 40 inches to a 2C horizon; are dominated by rounded and subrounded rock fragments of alluvial origin
Nint soils 20 to 40 inches to a lithic contact; dry for 75 to 90 consecutive days
Norod soils are 20 to 40 inches to a lithic contact; are 25 to 38 inches to secondary carbonates.
Skooker soils are dry for 60 to 90 consecutive days
Setill soils have a similar classification except for having isotic mineralogy.
Setill soils are 25 to 35 inches to compact glacial till; are dry for 75 to 90 consecutive days
Teoka soils are 20 to 40 to shale bedrock.
GEOGRAPHIC SETTING: Lainand soils are on hillslopes, sideslopes of ridges, plateaus, and canyons and have slopes of 15 to 65 percent. These soils formed in basalt colluvium with an influence of mixed loess and volcanic ash in the surface. Elevations are 2,000 to 3,500 feet. The mean annual precipitation is 12 to 15 inches. Summers are warm and dry and winters are cool and moist. The average January temperature is 24 degrees F. and the average July temperature is 68 degrees F. The mean annual temperature is 45 to 50 degrees F. The frost-free season is 80 to 135 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Blint, Camaspatch, Rockly, Tanksel, Windry, and Wockum soils on hillslopes. Blint soils are 20 to 40 inches to bedrock. Camaspatch soils are less than 20 inches to bedrock and are clayey-skeletal. Rockly soils are less than 20 inches to bedrock. Tanksel soils are clayey-skeletal and 20 to 40 inches to bedrock. Windry soils are 12 to 20 inches to bedrock. Wockum soils are fine-loamy.
DRAINAGE AND PERMEABILITY: Well drained; medium to very rapid runoff; moderately slow permeability.
USE AND VEGETATION: These soils are used for livestock grazing and wildlife habitat. Native vegetation includes bluebunch wheatgrass, Idaho fescue, Sandberg bluegrass, and Wyoming big sagebrush.
DISTRIBUTION AND EXTENT: Yakima and Kittitas Counties, Washington; MLRA 8. Series is of small extent.
MLRA OFFICE RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Yakima Training Center, Yakima County, Washington, 1994.
REMARKS: Diagnostic horizons and features recognized in this pedon include:
Mollic epipedon (Pachic) - from 0 to 22 inches (A1, A2 and AB horizons)
Argillic horizon - from 22 to 43 inches (2Bt1 and 2Bt2 horizons)
PSCS - zone from 22 to 42 inches
Vitrandic feature - from 0 to 22 inches (A1, A2 and AB horizons)
Soil moisture - xeric
The classification was changed from Pachic Argixerolls to Vitrandic Argixerolls in 1994.