LOCATION WYARNO WY+MTEstablished Series
TAXONOMIC CLASS: Fine, smectitic, mesic Ustic Haplargids
TYPICAL PEDON: Wyarno clay loam-rangeland. (Colors are for dry soil unless otherwise stated)
A--0 to 4 inches; grayish brown (10YR 5/2) clay loam, dark grayish brown (10YR 4/2) moist; moderate fine granular structure; soft, very friable, sticky and plastic; many fine and very fine roots; neutral (pH 7.2); gradual smooth boundary. (3 to 5 inches thick)
Bt--4 to 10 inches; brown (10YR 5/3) clay, brown (10YR 4/3) moist; moderate medium prismatic structure parting to strong medium subangular blocky; extremely hard, firm, very sticky and very plastic; common fine and very fine roots oriented along ped faces and few fine roots within ped matrix; many prominent clay films on faces of peds and in root channels; slightly alkaline (pH 7.4); clear wavy boundary (3 to 7 inches thick)
Bk1--10 to 13 inches; light olive brown (2.5Y 5/3) clay loam, olive brown (2.5Y 4/3) moist; weak medium prismatic structure parting to moderate medium subangular blocky; hard, very firm, sticky and plastic; strongly effervescent, calcium carbonate as common fine soft masses and filaments; moderately alkaline (pH 8.2); diffuse wavy boundary. (0 to 4 inches thick)
Bk2--13 to 60 inches; light olive brown (2.5Y 5/4) clay loam, olive brown (2.5Y 4/4) moist; massive; very hard, very firm, sticky and plastic; violently effervescent, calcium carbonate as common soft masses and filaments; moderately alkaline (pH 8.4).
TYPE LOCATION: Johnson County, Wyoming; NW1/4, NW1/4, sec. 31, T. 46 N., R. 81 W. Schlicht Draw Quadrangle. 43 degrees 55 minutes 10 seconds north latitude and 106 degrees 38 minutes 36 seconds west longitude.
RANGE IN CHARACTERISTICS: Depth to the base of the argillic horizon is 10 inches or less. Depth to horizons of continuous carbonate accumulations ranges from 7 to 12 inches. Rock fragments from 0 to 15 percent. The mean annual soil temperature ranges from 47 to 53 degrees F.
The A horizon has hue of 2.5Y or 10YR, value of 4 to 6 dry and 3 or 4 moist, and chroma of 2 or 3. It is neutral or slightly alkaline.
The Bt horizon has hue of 2.5Y, 10YR or 7.5YR, value of 4 to 6 dry and 3 to 5 moist, and chroma of 2 to 4. Texture is clay, silty clay loam or clay loam with 35 to 50 percent clay and 15 to 35 percent fine or coarser sand. It is neutral or slightly alkaline.
The Bk horizon has hue of 2.5Y or 10YR, value of 5 or 6 dry and 4 or 5 moist, and chroma of 2 to 4. Texture is clay, silty clay loam or clay loam with 35 to 42 percent clay. Calcium carbonate equivalent ranges from 6 to 14 percent. It is moderately alkaline or strongly alkaline.
COMPETING SERIES: These are the Agua Fria, Arp, Bessemer, Falfa, Manzanola, Mughouse, Rencalson, Renohill, Ulm and Winklo series. Agua Fria soils have gravelly or cobbly sandy loam strata at 18 to 36 inches. Arp, Mughouse, Rencalson, Renohill and Winklo soils have bedrock at 20 to 40 inches. Bessemer soils have loamy-skeletal material at depths of 11 to 20 inches. Falfa soils have argillic horizons over 40 inches thick. Manzanola and Ulm soils have argillic horizons greater than 10 inches thick.
GEOGRAPHIC SETTING: Wyarno soils are on fan remnants, fan aprons, fan piedmonts, alluvial fans and toeslopes of hills. They formed in fine textured alluvium. Slopes are 0 to 15 percent. Elevations range from 3,500 to 5,600 feet. The mean annual precipitation ranges from 12 to 14 inches of which about half falls as snow or rain in April, May, and early June. The mean annual air temperature is about 46 degrees F. and ranges from 45 to 47 degrees F. The frost-free season is estimated to range from 110 to 130 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Renohill and Ulm soils.
DRAINAGE AND PERMEABILITY: Well drained; medium or low runoff; moderately slow permeability.
USE AND VEGETATION: Rangeland, wildlife habitat, and limited dry cropland or irrigated pasture. Native vegetation consists of western wheatgrass, green needlegrass, blue grama and big sagebrush.
DISTRIBUTION AND EXTENT: Central and north central Wyoming and Colorado. These soils are of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Denver, Colorado
SERIES ESTABLISHED: Johnson County (southern part), Wyoming; 1971.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - 0 to 4 inches (A)
Argillic horizon - 4 to 10 inches (Bt)
MLRR- G
SIR- WY1079