LOCATION WINNETT CO+MT WYEstablished Series
TAXONOMIC CLASS: Fine, smectitic, mesic Ustic Natrargids
TYPICAL PEDON: Winnett silty clay loam - Rangeland. (Colors are for dry soil unless otherwise noted)
E--0 to 1 inch; light brown (7.5YR 6/4) silty clay loam, brown (7.5YR 5/4) moist; strong fine granular structure; slightly hard, friable, sticky and very plastic; common discontinuous random vesicular pores; violently effervescent; strongly alkaline (pH 8.8); abrupt smooth boundary. (0 to 2 inches thick)
Btn1--1 to 2 inches; pink (7.5YR 7/4) silty clay, dark brown (7.5YR 4/4) moist; strong medium columnar structure parting to strong fine angular blocks; extremely hard, firm, sticky and plastic; common discontinuous random vesicular pores; violently effervescent; very strongly alkaline (pH 9.6); clear smooth boundary. (1 to 3 inches thick)
Btn2--2 to 6 inches; light brown (7.5YR 6/4) silty clay, brown (7.5YR 5/4) moist; strong fine angular blocky structure; hard, friable, sticky and very plastic; many fine roots; violently effervescent; very strongly alkaline (pH 9.6); clear smooth boundary. (3 to 7 inches thick)
C--6 to 37 inches; light brown (7.5YR 6/4) silty clay loam, brown (7.5YR 5/4) moist; massive; hard, friable, very sticky and plastic; violently effervescent; strongly alkaline (pH 8.6); clear wavy boundary. (25 to 35 inches thick)
Ck--37 to 60 inches; pale brown (10YR 6/3) silty clay, dark brown (10YR 4/3) moist; massive; very hard, firm, sticky and plastic; common fine lime threads; violently effervescent; moderately alkaline (pH 8.4).
TYPE LOCATION: San Miguel County, Colorado; 2,200 feet east and 2,600 feet north of the southwest corner of Sec. 8, T. 44 N., R. 16 W.
RANGE IN CHARACTERISTICS: Mean annual soil temperature ranges from 48 to 51 degrees F., and mean summer soil temperature ranges from 65 to 68 degrees F. The moisture control section is dry for 15 consecutive days from May 15 to July 15 when the soil temperature at 20 inches is greater than 41 degrees F. It is neither dry in all parts of the moisture control section for as long as 45 consecutive days following the summer solstice to October 20, nor for as long as 90 cumulative days during the period.
Clay percentage in the particle size control section ranges from 35 to 50 percent. These soils are calcareous to the surface. Secondary lime occurs as fine threads in the substrata.
Coarse fragments range 0 to 15 percent throughout the pedon but are normally less than one percent. Depth to the base of the Bt horizon ranges from 4 to 12 inches.
The E horizon has hue of 2.5Y through 7.5YR, value of 6 or 7 dry, 4 or 5 moist, and chroma of 2 through 4.
The Bt horizon has hue of 2.5Y through 7.5YR, value of 5 through 7, 4 or 5 moist, and chroma of 2 through 4. Texture is silty clay or silty clay loam.
The C horizon has hue of 2.5Y through 7.5YR, value of 5 or 6, 4 or 5 moist, and chroma of 2 through 4. Texture is silty clay loam or silty clay.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Winnett soils are on alluvial valley floors and drainage bottoms. Slopes are 1 to 3 percent. Winnett soils are in a climatic setting that receives precipitation uniformly throughout the year with over 50 percent received as snow. The average annual precipitation ranges from 10 to 12 inches, mean annual temperature is 46 to 49 degrees F., and the mean summer air temperaturer ranges from 63 to 66 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bodot, Vananda and Zyme soils. Bodot soils lack a natric horizon and have a paralithic contact above a depth of 40 inches. Vananda soils lack a natric horizon. Zyme soils have a paralithic contact above a depth of 20 inches.
DRAINAGE AND PERMEABILITY: Well drained; slow runoff; very slow permeability.
USE AND VEGETATION: These soils are used for rangeland and wildlife habitat. Native vegetation is mainly greasewood, gardner saltbush, western wheatgrass, and fourwing saltbush.
DISTRIBUTION AND EXTENT: Southwestern Colorado and possibly adjacent parts of New Mexico and Utah. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Denver, Colorado
SERIES ESTABLISHED: Reconnaissance Soil Survey of Central Montana, 1949.
REMARKS: This draft documents a change in type location and responsibility for this series from Montana to Colorado. Pedon is representative of file number SM-29 and map unit 17 in San Miguel County Area. Diagnostic features include the natric horizon from the surface to a depth of 12 inches.