LOCATION GARRETT WYEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Pachic Argiustolls
TYPIFYING PEDON: Garrett sandy loam, grassland. (Colors are for dry soil unless otherwise noted.)
A1--0 to 4 inches; grayish brown (10YR 5/2) light sandy loam, dark brown (10YR 3/3) moist; strong very fine granular structure; soft, very friable; neutral (pH 7.0); clear smooth boundary. (4 to 5 inches thick)
B1--4 to 9 inches; brown (7.5YR 5/3) sandy loam, dark brown (7.5YR 3/3) moist; weak very coarse prismatic structure that parts to weak coarse subangular blocks; slightly hard, very friable; thin glossy coatings on some sand grains; neutral (pH 7.4); clear smooth boundary. (4 to 5 inches thick)
B21t--9 to 24 inches; reddish brown (5YR 5/3) sandy clay loam, reddish brown (5YR 3/3) moist; moderate coarse prismatic structure that parts to moderate coarse subangular blocks; slightly hard, very friable; thin wax-like patches on peds; glossy coatings in root channels; thin wax-like coatings on sand grains, and wax-like bridges between sand grains; neutral (pH 7.0); clear smooth boundary. (4 to 10 inches thick)
B22t--24 to 30 inches; reddish brown (5YR 5/3) sandy clay loam, reddish brown (5YR 4/3) moist; moderate coarse prismatic structure that parts to moderate coarse subangular blocks; hard, very friable; thin wax-like patches on peds; glossy coatings on sand grains, and wax-like bridges between sand grains; neutral (pH 7.2); gradual smooth boundary. (4 to 17 inches thick)
B3--30 to 36 inches; reddish brown (5YR 5/3) heavy sandy loam, reddish brown (5YR 4/3) moist; weak coarse subangular blocky structure; slightly hard, very friable; few glossy coatings on sand grains and few wax-like bridges between sand grains; mildly alkaline (pH 7.4); gradual smooth boundary. (4 to 12 inches thick)
Cca--36 to 60 inches; light reddish brown (5YR 6/3) sandy loam, reddish brown (5YR 4/3) moist; massive; soft, very friable; some visible secondary calcium carbonate occurring as concretions, in thin seams and streaks, and as coatings on sand grains; calcareous; moderately alkaline (pH 8.0). (Several feet thick)
TYPE LOCATION: An unsectionized portion of Johnson County, Wyoming. The type location indicated on aerial photograph 14-N76.
RANGE IN CHARACTERISTICS: Thickness of the mollic epipedon ranges from 20 to 40 inches, depth to calcareous material ranges from 20 to 40 inches, thickness of solum ranges from 20 to 40 inches. Organic carbon in the mollic epipedon ranges from .8 to 2 percent and decreases uniformly with depth. The soil is 80 to 100 percent. Mean annual soil temperature ranges from 0 to 15 percent but are typically less than 5 percent. Mean annual soil temperature ranges from 47 degrees to 58 degrees F., and mean summer soil temperature from 59 degrees to 78 degrees F. The A1 horizon has hue of 10YR or 7.5YR, value of 4 or 5 dry, 2 or 3 moist, and chroma of 2 through 4. It usually has granular structure but has weak subangular blocky structure in some pedons. This horizon is soft or slightly hard and is neutral or mildly alkaline. The B2t horizon has hue of 5YR through 10R, value of 5 or 6 dry, 3 through 5 moist, and chroma of 3 or 4. It usually has coarse prismatic structure, but it has subangular blocky structure in some pedons. This horizon is typically sandy clay loam but clay ranges from 18 to 35 percent, silt from 5 to 30 percent, and sand from 45 to 75 percent, with more than 35 percent fine sand or coarser. It is neutral or mildly alkaline. The C horizon has hue of 5YR through 10YR. It has about 4 to 10 percent calcium carbonate equivalent. Accumulation of secondary calcium carbonate is weak but consistent from pedon to pedon. This horizon is mildly to strongly alkaline.
COMPETING SERIES AND THEIR DIFFERENTIAE: These are the Haxton, Jarita, Keya, Marydel, Prosper, Renner, Sampson, Windom and Woodly series. Haxton, Keya, Marydel, Prosper, Renner, Sampson, Windom and Woodly soils have hue no redder than 7.5YR in the B2t horizon. Jarita soils have limestone bedrock above depth of 40 inches.
SETTING: These soils are on gently to moderately sloping alluvial fans and valley filling side slopes where materials have been weathered and locally transported from reddish brown sandstones and loamstones. Slope gradients are usually 0 to 15 percent. These soils formed in moderately coarse textured calcareous alluvial sediments derived principally from reddish brown calcareous sedimentary rock. At the type location the average annual precipitation is 14 inches with peak periods of precipitation during the spring and early summer. Mean annual temperature is 47 degrees F., and mean summer temperature is 63 degrees F.
PRINCIPAL ASSOCIATED SOILS: These are the Barnum and LaLande soils. The Barnum and LaLande soils lack a mollic epipedon and an argillic horizon.
DRAINAGE AND PERMEABILITY: Well to somewhat excessively drained; slow runoff; rapid permeability.
USE AND VEGETATION: These soils are used principally as native pastureland; however, they may be tilled to both dry land and irrigated crops in some localities. Principal native vegetation is blue grama, needleandthread grass and sage.
DISTRIBUTION AND EXTENT: North-central Wyoming. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Johnson County (Southern Johnson Area), Wyoming, 1971.
REMARKS:
The superactive cation exchange activity class was added in 03/2003 to the taxonomic classification by the National Soil Survey Center on request of the Reno MLRA office, without review of the soil series property data. The remainder of this document has not been updated.