LOCATION LYMANSON WY+COEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive Ustic Argicryolls
TYPICAL PEDON: Lymanson loam-rangeland. (Colors are for dry soil unless otherwise stated.)
A--0 to 5 inches; grayish brown (10YR 5/2) loam, very dark grayish brown (10YR 3/2) moist; strong fine granular structure; soft, very friable, slightly sticky and slightly plastic; mildly alkaline (pH 7.6); clear smooth boundary. (2 to 6 inches thick)
Bt--5 to 10 inches; brown (10YR 5/3) loam, dark brown (10YR 3/3) moist; moderate coarse prismatic structure parting to moderate medium subangular blocky; hard, very friable, sticky and slightly plastic; common thin clay films on faces of peds and common moderately thick clay films in root channels; mildly alkaline (pH 7.8); clear wavy boundary. (5 to 14 inches thick)
Btk--10 to 13 inches; brown (10YR 5/3) loam, brown (10YR 4/3) moist; weak medium subangular blocky structure; hard, very friable, sticky and slightly plastic; few thin clay films on faces of peds; matrix slightly effervescent, lime as few fine soft masses; moderately alkaline (pH 8.1); gradual wavy boundary. (2 to 5 inches thick)
Bk--13 to 30 inches; light olive brown (2.5Y 5/3) loam, olive brown (2.5Y 4/3) moist; massive; hard, very friable, slightly sticky and nonplastic; strongly effervescent, lime as common fine and medium soft masses, in seams and as filaments and threads; moderately alkaline (pH 8.4); clear wavy boundary. (10 to 30 inches thick)
Cr--30 to 60 inches; soft, calcareous sandstone interbedded with loamstone, shale, and discontinuous hard sandstone lenses.
TYPE LOCATION: Johnson County, Wyoming; NE1/4 of sec. 28, T. 45 N., R. 82 W.
RANGE IN CHARACTERISTICS: Depth of the paralithic contact and soft sandstone is typically 25 to 35 inches but ranges from 20 to 40 inches. The mollic epipedon ranges from 7 to 15 inches thick. Depth to the base of the argillic horizon is 10 to 23 inches. The mean annual soil temperature ranges from 39 to 44 degrees F. and the mean summer soil temperature ranges from 47 to 52 degrees F. Rock fragments range from 0 to 35 percent and may be either cobble, pebbles, or a mixture of both throughout the soil to the paralithic contact. The EC is 2 mmhos or less throughout.
The A horizon has hue of 2.5Y through 7.5YR, value of 4 or 5 dry, 2 or 3 moist, and chroma of 2 or 3. Reaction is typically neutral or mildly alkaline but may be moderately alkaline due to recharge of carbonates from upslope.
The Bt argillic horizon has hue of 2.5Y through 7.5YR, value of 4 through 6 dry, 3 through 5 moist, and chroma of 2 through 4. Matrix texture is loam, clay loam, or sandy clay loam with 18 to 35 percent clay and more than 15 but less than 35 percent fine or coarser sand. Coarse fragments do not exceed 35 percent as defined above and are cobbles or pebbles or both. Reaction ranges from neutral to moderately alkaline.
The Btk horizon has hue of 2.5Y through 7.5YR, value of 5 or 6 dry, 4 or 5 moist, and chroma of 2 through 4. Matrix texture is as defined for the Bt horizon. The Btk is typically part of the argillic horizon but may be transitional in some pedons. Reaction is mildly or moderately alkaline.
The Bk horizon has hue of 5Y through 7.5YR, value of 5 through 8 dry, 4 through 7 moist, and chroma of 2 through 4. Matrix textures are loam, fine sandy loam, sandy loam, or sandy clay loam modified with 0 to 35 percent cobble, pebbles, or both. Clay ranges from 15 to 28 percent. Calcium carbonate equivalent ranges from 4 to 15 percent. Reaction is moderately or strongly alkaline. A C horizon is present in some pedons.
COMPETING SERIES: These are the
Amsden,
Buffork,
Croydon,
Dra,
Gelkie,
Hourglass,
Inchau,
Kezar,
Kittredge,
Leavitt,
Lucky,
Lyonman,
Michelson,
Miracle,
Monad,
Morset,
Mult,
Newlands,
Passcreek,
Philipsburg,
Primeaux,
Rammel, Sonseller,
Swede,
Tingey,
Tripit,
Troutdale,
Wellsville,
Woosley, and
Youga series. Amsden, Croydon, Gelkie, Hourglass, Kittredge, Leavitt, Lyonman, Michelson, Monad, Morset, Philipsburg, Tingey, Wellsville, and Youga soils are deep. Buffork, Inchau, Swede, and Troutdale soils are noncalcareous throughout. Dra, Kezar, Lucky, Miracle, Mult, Newlands,
Passcreek, Primeaux, Rammel,
Sponseller, and Woosley soils have a lithic contact at 20 to 40 inches. Miracle and Tripit soils have hue of 5YR through 10R.
GEOGRAPHIC SETTING: Lymanson soils are on mountain and ridge summits, shoulders, and backslope and footslope positions. These soils formed in calcareous, medium, or moderately fine textured material weathered from sedimentary rock. Colluvial slopewash, soil creep, and other colluvial processes have influenced soil properties and contributed coarse fragments unlike the sedimentary beds. Slopes range from 4 to 40 percent. Elevation ranges from 7,000 to 9,500 feet. The mean annual precipitation ranges from 15 to 19 inches. THE mean annual temperature ranges from 33 to 42 degrees F. The frost-free season is variable and is estimated to range from 30 to 90 days depending upon elevation, aspect, and air drainage.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Jenkinson, Mosroc, and Turk soils and the competing Gelkie soils. Jenkinson and Mosroc soils have a lithic contact at less than 20 inches. Also, Jenkinson soils do not have an argillic horizon and Mosroc soils are skeletal throughout. Turk soils have more than 60 percent clay in the control section.
DRAINAGE AND PERMEABILITY: Well drained; slow or medium runoff depending upon slope; moderate permeability.
USE AND VEGETATION: These soils are used for rangeland and wildlife habitat. Native vegetation is western wheatgrass, spike fescue, Idaho fescue, and big sagebrush.
DISTRIBUTION AND EXTENT: Mountainous areas of western and north-central Wyoming and northern Colorado. The series is of moderate extent.
MLRA OFFICE RESPONSIBLE: Lakewood, Colorado
SERIES ESTABLISHED: Johnson County (Southern Part), Wyoming; 1971.