LOCATION TEPETE             ID+WY+MT
Established Series
Rev. TWP/CBR/FCF
02/2008

TEPETE SERIES


The Tepete series consists of very deep, very poorly drained organic soils that formed in herbaceous material overlying mixed alluvium. These soils form in swales, marshes, and depressions on the lower parts of fan remnants. Slopes are 0 to 2 percent. The average annual precipitation is about 457 millimeters and the average annual air temperature is about 4 degrees C.

TAXONOMIC CLASS: Loamy, mixed, euic Terric Cryohemists

TYPICAL PEDON: Tepete mucky peat in a level wet meadow at 1832 meters. (Colors are for moist soil unless otherwise noted.)

Oe1--0 to 18 cm; very dark brown (10YR 2/2), mucky peat; about 40 percent fiber and 35 percent rubbed; many very fine and fine and common medium roots; massive; fibers are primarily brown (10YR 4/3) and very dark brown (10YR 2/2) dry sedges and rushes; moderately acid (pH 5.6); clear smooth boundary. (13 to 30 cm thick)

Oe2--18 to 36 cm; black (10YR 2/1) mucky peat; about 40 percent fiber and 35 percent rubbed; many very fine and common fine and medium roots; massive; fibers are primarily sedges and rushes; moderately acid (pH 5.6); clear smooth boundary. (10 to 51 cm thick)

Oe3--36 to 64 cm; black (10YR 2/1) mucky peat, black (10YR 2/1) dry; about 75 percent fiber and 60 percent rubbed; fibrous or massive; extremely hard and wets very slowly, very friable, few very fine and fine roots; fibers are primarily sedges and rushes; neutral (pH 6.8); clear smooth boundary. (15 to 64 cm thick)

Oe4--64 to 74 cm; black (10YR 2/1) mucky peat, black (10YR 2/1) dry; few thin layers of very dark gray (N 3/) silty clay loam, dark gray (N 4/) dry; about 75 percent fiber and 60 percent rubbed; massive; extremely hard, very friable, slightly sticky and slightly plastic; fibers are primarily sedges and rushes; neutral (pH 6.8); clear smooth boundary. (0 to 25 cm thick)

A--74 to 86 cm; black (N 2/) silty clay loam, dark gray (2.5Y 4/1) dry; massive; extremely hard, firm, moderately sticky and moderately plastic; common very fine tubular pores; contains common partially decomposed plant remains; neutral (pH 6.8); clear smooth boundary. (0 to 25 cm thick)

Cg1--86 to 109 cm; dark gray (5Y 4/1) silty clay loam, gray (5Y 6/1) dry; massive; very hard, friable, moderately sticky and moderately plastic; few very fine tubular pores; common fine prominent black (10YR 2/1) and few fine distinct very dark grayish brown (10YR 3/2) irregularly shaped iron masses around roots and on surfaces along pores; the lower 8 to 15 cm of this horizon contains pockets of very fine sand and silt having common coarse prominent yellowish brown (10YR 5/6) irregularly shaped iron masses, brownish yellow (10YR 6/6) dry; contains common partially decomposed plant remains; slightly alkaline (pH 7.6); clear wavy boundary. (0 to 51 cm thick)

2Cg2--109 to 147 cm; grayish brown (2.5Y 5/2) gravelly loamy sand, light brownish gray (2.5Y 6/2) dry; single grain; loose; nonsticky and nonplastic; 30 percent gravel, dominantly granite and some sandstone, quartzite, limestone; moderately alkaline (pH 8.0). (0 to 51 cm thick)

2Cg3--147 to 152 cm; very gravelly sand; single grain; loose; nonsticky and nonplastic; 50 percent gravel; moderately alkaline (pH 8.0).

TYPE LOCATION: Teton County, Idaho; about 4 kilometers west of Driggs; 132 meters east and 56 meters south of the northwest corner of section 28, T. 5 N., R. 45 E; USGS Bates topographic quadrangle; lat. 43 degrees 44 minutes 15 seconds N. and long. 111 degrees 9 minutes 34 seconds W., NAD 83.

RANGE IN CHARACTERISTICS:
Thickness of organic materials: 41 to 114 cm
Depth to the 2Cg horizon: 50 to greater than 152 cm
Particle-size control section: averages 0 to 30 percent gravel and 15 to 30 percent clay
Soil reaction: moderately acid to moderately alkaline
Mean annual soil temperature: 1.7 to 5.6 degrees C.
Mean summer soil temperature: 4.4 to 6.1 degrees C. (cryic temperature regime)

Oe horizons
Hue: 10YR through 5Y, or neutral
Value: 1 to 4 moist or dry
Chroma: 0 to 2 moist or dry
Reaction: strongly acid to neutral, in some hummocky areas the surface 2 inches of mounds is
calcareous
Other: surface few inches are sapric material in some pedons

A horizon (when present)
Hue: N, 10YR, 10GY moist
Value: 2 to 5 moist
Chroma: 0 to 2 moist
Texture: SICL, MK-SIL with 18 to 35 percent clay
Cg horizon (when present)
Hue: 2.5Y or 5Y moist
Value: 4 or 5 moist
Chroma: 1 or 2 moist
Texture: SICL, SIL, GR-SIL with 18 to 35 percent clay
Redoximorphic features (where they occur): Value 2 to 5, chroma 1 to 6 moist

2Cg horizons (when present)
Hue: 2.5Y or 10YR moist
Chroma: 2 or 3 moist
Texture: LS, S, SCL, L with 0 to 60 percent gravel and 3 to 27 percent clay

COMPETING SERIES: These are the Doroshin, Hewitt, and Stanbro (T) series. Doroshin and Stanbro soils lack continuous layers of loamy sand and sand in the lower part of the series control section. Hewitt soils have a mean annual soil temperature of about 1 degree C and lack sand and gravel in the lower part of the profile.

GEOGRAPHIC SETTING:
Landscape: Outwash and alluvial plains
Landform: Swales, marshes and depressions on valley floors
Elevation: 1768 to 2134 meters
Slope: 0 to 2 percent
Parent material: Herbaceous materials over mixed alluvium
Mean annual air temperature: 1 to 6 degrees C
Mean annual precipitation: 305 to 635 millimeters
Frost free period: 20 to 80 days

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Boquet, Furniss, Foxcreek, Zohner, and Cedron[cr2] soils, all of which are mineral soils. These soils are on adjacent flood plains, terraces, oxbows, swales and marshes.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class: Very poorly drained
Runoff: Negligible
Saturated hydraulic conductivity: Very high in the organic layer,
moderately low in the upper part of the mineral material and very high in the lower part
of the mineral material
Flooding frequency and duration: Frequent flooding or ponding for long or very long durations

USE AND VEGETATION:
Major uses: Pasture; if partially drained and seeded with clovers and grasses, used for hay
Range/ecological site: R013XY051ID, R013XY055ID, and R044XS365MT
Dominant native vegetation: Nebraska sedge, baltic rush, beaked sedge, shrubby cinquefoil and
willows

DISTRIBUTION AND EXTENT:
Distribution: Southeastern Idaho, western Wyoming and southwestern Montana; MLRA 13 and 44
Extent: The soils are not extensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Teton County, Idaho, 1975; Teton Area, Idaho-Wyoming Soil Survey

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Organic layer: 0 to 74 cm
Mineral layer: the zone from 74 to 152 cm
Soil temperature regime: Cryic
Soil moisture regime: Aquic
Series control section: from a depth of 0 to 132 cm
Particle size control section: from a depth of 74 to 132 cm


National Cooperative Soil Survey
U.S.A.