LOCATION TETONVILLE WYEstablished Series
TAXONOMIC CLASS: Sandy-skeletal, mixed Mollic Cryofluvents
TYPICAL PEDON: Tetonville fine sandy loam, cultivated. (Colors are for dry soil unless otherwise stated).
Ap--O to 8 inches; grayish brown (10YR 5/2) fine sandy loam, very dark grayish brown (10YR 3/2) moist; moderate fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; mildly alkaline (pH 7.8); clear smooth boundary. (4 to 8 inches thick)
C1--8 to 17 inches; light brownish gray (10YR 6/2) fine sandy loam stratified with thin lenses of loamy sand, dark grayish brown (10YR 4/2) moist; weak medium subangular blocky structure that parts to moderate fine granular structure; slightly hard, very friable, slightly sticky; mildly alkaline (pH 7.6); gradual wavy boundary. (6 to 20 inches thick)
IIC2--17 to 60 inches; light brownish gray (10YR 6/2) extremely gravelly loamy sand, dark grayish brown (10YR 4/2) moist; single grained; loose;50 percent gravel and .5 percent cobbles; mildly alkaline (pH 7.6).
TYPE LOCATION: Teton County, Wyoming; approximately 450 feet north and 200 feet east of the SW corner of the NE1/4 of the NW1/4 of sec. 13, T.41N., R.117W.
RANGE IN CHARACTERISTICS: The part of the profile dark enough and high enough in organic matter to be a mollic epipedon is 6 to 10 inches thick. Depth to the IIC horizon is 10 to 25 inches. Some mottles with chroma of 2 or less are found below depth of 20 inches in some pedons. The mean annual soil temperature is 38 degrees to 40 degrees F. The upper part of the control section has more than 50 percent fine or coarser sand. When mixed, the control section averages 35 to 70 percent rock fragments. The matrix material averages loamy sand or loamy fine sand.
The A horizon has hue of 2.5Y or 10YR, value of 4 through 6 dry, 2 through 4 moist, and chroma of 1 through 3. It is fine sandy loam, gravelly loam, or very gravelly sandy loam. It is neutral or mildly alkaline.
The C horizon has hue of 2.5Y or 10YR. It contains discontinuous lenses of loamy sand, fine sandy loam and silt loam. Gravel and cobbles range from O to 70 percent. This horizon is mildly or moderately alkaline.
The IIC horizon has hue of 2.5Y or 10YR. It has 45 to 70 percent gravel and 10 percent cobbles. The matrix is sand or loamy sand. This horizon is mildly or moderately alkaline.
COMPETING SERIES: This is the Wilsonville series. Wilsonville soils have a very gravelly sand or loamy sand IIC horizon at depths of 26 to 40 inches.
GEOGRAPHIC SETTING: Tetonville soils are on nearly level to gently sloping stream bottom lands and terraces. Slopes are 0 to 3 percent. The soils formed in gravelly and cobbly noncalcareous alluvium. Elevations are 6,000 to 7,000 feet. Average annual precipitation is 15 to 21 inches. The mean annual temperature is about 34 degrees to 38 degrees F. The frost-free season is less than 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Newfork soils and the competing Wilsonville soils. Newfork soils have an aquic moisture regime.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; slow runoff; moderately rapid permeability. A water table fluctuates to within 12 inches of the surface during the growing season.
USE AND VEGETATION: These soils are used for irrigated cropland, rangeland, homesites and other community uses, recreation, and wildlife habitat. Native vegetation is narrow leaf cottonwood, willows, Kentucky bluegrass, alpine timothy, Nebraska sedge, and baltic rush.
DISTRIBUTION AND EXTENT: In the intermountain valleys in western Wyoming. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Teton County, Wyoming, Grand Teton National Park Area, 1975.
OSED scanned by NSSQA. Last revised by state on 12/75.