LOCATION TURK WYEstablished Series
TAXONOMIC CLASS: Very-fine, illitic Vertic Argicryolls
TYPICAL PEDON: Turk silty clay loam - grassland (Colors are for dry soil unless otherwise noted.)
A--0 to 4 inches; brown (10YR 5/3) silty clay loam, very dark grayish brown (10YR 3/2) moist; moderate fine granular structure; slightly hard, very friable; neutral (pH 7.2); clear smooth boundary. (3 to 6 inches thick)
BA--4 to 7 inches; grayish brown (10YR 5/2) silty clay loam, very dark grayish brown (10YR 3/2) moist; strong very fine subangular blocky structure that parts to strong coarse granules; hard, very friable; few thin glossy patches on faces of peds; neutral (pH 7.2); clear smooth boundary. (3 to 5 inches thick)
Bt1--7 to 11 inches; grayish brown (10YR 5/2) clay, very dark grayish brown (10YR 3/2) moist; moderate medium prismatic structure that parts to strong medium angular blocky; extremely hard, very friable, very plastic; faint clay films on faces of peds intermingled with glass-like shiny slickenside surfaces; clay films in root channels; slightly alkaline (pH 7.4); clear wavy boundary. (0 to 6 inches thick)
Bt2--11 to 18 inches; grayish brown (2.5Y 5/2) clay, dark grayish brown (2.5Y 4/2) moist; strong medium prismatic structure that parts to strong medium angular blocks; extremely hard, very plastic; faint nearly continuous clay films intermingled with some glass-like shiny slickensides; clay films in root channels and pores; slightly alkaline (pH 7.8); gradual wavy boundary. (5 to 17 inches thick)
Bk--18 to 24 inches; grayish brown (2.5Y 5/2) clay, dark grayish brown (2.5Y 4/2) moist; weak coarse angular blocky structure; extremely hard, very plastic; few glossy patches on faces of peds; some glossy coatings in root channels; few glass-like slickenside surfaces; some visible secondary calcium carbonate occurring as concretions and in thin seams and streaks; calcareous; moderately alkaline (pH 8.4); gradual wavy boundary. (4 to 6 inches thick)
Ck--24 to 32 inches; grayish brown (2.5Y 5/2) clay, dark grayish brown (2.5Y 4/2) moist; massive; extremely hard, very plastic; many partially weathered shale fragments; visible secondary calcium carbonate occurring as concretions and in thin seams and streaks; calcareous; moderately alkaline (pH 8.3); gradual smooth boundary. (5 to 20 inches thick)
Cr--32 to 60 inches; olive gray calcareous shale.
TYPE LOCATION: Johnson County, Wyoming; NE1/4 NE1/4 sec. 28, T.45N., R.85W.
RANGE IN CHARACTERISTICS: The mollic epipedon ranges from 7 to 15 inches thick, depth to calcareous material ranges from 8 to 20 inches, the solum ranges from 15 to 40 inches thick and depth to the shale bedrock ranges from 20 to 40 inches. Organic carbon in the mollic epipedon ranges from 1 to 3 percent and decreases uniformly with increasing depth. The soil is 90 to 100 percent base saturated. Cation exchange capacity ranges from 30 to 60 milliequivalents per 100 grams of clay. Rock fragments are typically less than 2 percent and range from 0 to 5 percent. Mean annual soil temperature ranges from 32 degrees to 46 degrees F., and mean summer soil temperature ranges from 40 degrees to 58 degrees F. without an 0 horizon. The A horizon has hue of 2.5Y or 10YR, value of 4 or 5 dry, 2 or 3 moist and chroma of 1 or 2. It usually has granular or crumb structure but has weak subangular blocky structure in some pedons. This horizon is soft or slightly hard and neutral or slightly alkaline. The Bt horizon has hue of 5Y through 10YR, value of 4 through 6 dry, 3 through 5 moist and chroma of 2 through 4. It is 60 to 100 percent clay, 0 to 40 percent silt, and 0 to 40 percent sand. This horizon usually has prismatic structure but has angular blocky structure in some pedons. Oriented clay films occur in some part. This horizon is neutral to moderately alkaline and it is weakly calcareous in the lower part in some pedons. The Ck horizon has hue of 5Y through 10YR. It has approximately 2 to 12 percent calcium carbonate equivalent. This horizon is moderately or strongly alkaline.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: These soils are on gently to moderately sloping upland hills and ridges where the fine textured shale bedrock is near the surface. Slopes usually range from 0 to about 15 percent. These soils formed in fine textured materials weathered residually from underlying clay shales. At the type location the average annual precipitation is 20 inches, with peak periods of precipitation during the spring and early summer. Mean annual temperature is 36 degrees F., and mean summer temperature is 50 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Owen Creek soils and the Amsden soils. Amsden soils have hue of 5YR or redder and have a fine-loamy control section.
DRAINAGE AND PERMEABILITY: Well-drained; rapid runoff; slow permeability.
USE AND VEGETATION: These soils are used principally as native pastureland. Principal native vegetation is green needlegrass, Idaho fescue and sages.
DISTRIBUTION AND EXTENT: Bighorn Mountain areas of north-central Wyoming. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Johnson County (Southern Johnson Area), Wyoming, 1971.