LOCATION TREBOR SD
Established Series
Rev. ACM-KEC
12/2021
TREBOR SERIES
The Trebor series consists of moderately deep, well drained soils formed in residuum from limestone. They have moderately slow permeability in the solum and moderate permeability in the underlying material. Slopes range from 6 to 60 percent. Mean annual temperature is about 38 degrees F, and mean annual precipitation is about 24 inches.
TAXONOMIC CLASS: Loamy-skeletal, carbonatic Eutric Haplocryalfs
TYPICAL PEDON: Trebor silt loam - on a 13 percent convex northwest-facing slope under a ponderosa pine forest at 6,700 feet. When described the soil was dry throughout. (Colors are for dry soil unless otherwise stated.)
Oi--0 to 1 inch; forest litter and slightly decomposed forest litter. (1 to 3 inches thick)
E--1 to 3 inches; pinkish gray (7.5YR 7/2) silt loam, dark brown (7.5YR 4/2) moist; weak medium and thick platy structure; slightly hard, friable; many fine roots; slightly acid; abrupt wavy boundary. (1 to 4 inches thick)
Bt--3 to 7 inches; reddish brown (5YR 5/3) channery silty clay, reddish brown (5YR 4/3) moist; faces of peds dark reddish brown (5YR 3/3) moist; weak coarse prismatic structure parting to moderate fine and medium blocky; very hard, firm, sticky and plastic; common fine and coarse roots; common fine pores; 20 percent by volume fragments of limestone; neutral; gradual wavy boundary. (4 to 8 inches thick)
BC--7 to 11 inches; reddish brown (5YR 5/3) and very pale brown (10YR 7/4) channery silt loam, reddish brown (5YR 4/3) and yellowish brown (10YR 5/4) moist; moderate fine and medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; few fine and coarse roots; 20 percent by volume fragments of limestone; slight effervescence; slightly alkaline; gradual wavy boundary. (3 to 7 inches thick)
C--11 to 30 inches; yellow (10YR 8/6) very channery silt loam, brownish yellow (10YR 6/6) moist; weak medium and coarse subangular blocky structure; hard, friable; few fine and coarse roots; 45 percent by volume fragments of limestone; strong effervescence; moderately alkaline; gradual wavy boundary.
R--30 to 60 inches; fractured limestone.
TYPE LOCATION: Lawrence County, South Dakota; about 8 miles west and 12 miles south of Lead; 2475 feet east and 660 feet north of the southwest corner of sec. 31, T. 3 N., R. 2 E.
RANGE IN CHARACTERISTICS: Depth to the base of the argillic horizon is 5 to 10 inches. Coarse fragments range from 5 to 60 percent by volume in the solum and from 35 to 80 percent by volume in the C horizon. The control section averages from 18 to 35 percent clay and 35 to 60 percent by volume of coarse fragments. Depths to carbonates ranges from 5 to 14 inches. Depth to bedrock ranges from 20 to 40 inches.
The E horizon has hue of 7.5YR or 10YR, value of 4 to 7 and 3 to 5 moist, and chroma of 2 or 3. It is loam, silt loam, channery loam, channery silt loam, flaggy loam, or flaggy silt loam. It is moderately or slightly acid. Some pedons have an A horizon of 1 inch or less in thickness.
The Bt horizon has hue of 5YR to 10YR, value of 4 to 6 and 3 or 4 moist, and chroma of 3 or 4. It is clay loam, silty clay loam, silty clay or clay and contains up to 60 percent channers and flagstones. It averages between 35 and 50 percent clay. It is slightly acid or neutral.
Some pedons have a thin BE horizon.
The BC horizon has hue of 5YR to 10YR, value of 5 to 8 and 4 to 6 moist, and chroma of 2 to 6. It is silt loam, silty clay loam, or clay loam and contains up to 60 percent channers and flagstones. It is neutral or slightly alkaline.
Some pedons have a Bk horizon with colors and texture of the BC horizon. It is slightly or moderately alkaline.
The C horizon has hue of 10YR or 7.5YR, value of 6 to 8 and 4 to 6 moist, and chroma of 2 to 6. It is silt loam, loam, or clay loam and contains up to 80 percent channers and flagstones. It is slightly or moderately alkaline.
COMPETING SERIES: These are the
Agneston,
Angostura,
Cloud Peak,
Cundiyo,
Duchesne,
Frisco,
Gambler,
Granile,
Guffey,
Hyattville,
Kebler,
Lake Creek,
Lakehelen,
Larand,
Leadville,
Lulude, MacFarlane,
Presa,
Tigeron, and
Tolvar series. All these soils have the base of the argillic horizon at depths greater than 10 inches.
GEOGRAPHIC SETTING: Trebor soils are moderately sloping to very steep on mountains at elevations of 6200 to 7200 feet. Slope gradients ranges from 6 to 60 percent. These soils formed in residuum from limestone. Mean annual temperature ranges from 32 degrees to 45 degrees F, and mean annual precipitation ranges from 18 to 28 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are
Lail,
Redbird, and
Stovho soils. All of these soils have limestone at depths greater than 40 inches.
DRAINAGE AND PERMEABILITY: Well drained. Runoff is high or very high. Permeability is moderately slow in the solum and moderate in the underlying material.
USE AND VEGETATION: Used for timber production, recreation and wildlife, and for grazing. Native vegetation is dominantly ponderosa pine and Black Hills spruce with lesser amounts of aspen and birch. Dominant grass species included bearded wheatgrass, oatgrass, sedges, and bromegrass. Dominant forbs include arrowleaf balsamroot, yarrow, and iris. Dominant shrubs are oregon-grape, bearberry, snowberry and common juniper.
DISTRIBUTION AND EXTENT: Higher elevations of the Black Hills in western South Dakota and eastern Wyoming. The series is moderately extensive.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Salina, Kansas
SERIES ESTABLISHED: Lawrence County, South Dakota, 1977.
REMARKS: Diagnostic horizons and features recognized in this pedon are: ochric epipedon - the zone from the surface of the soil to a depth of about 3 inches (E horizon); argillic horizon - the zone from about 3 to 7 inches (Bt horizon). Depths were adjusted to account of for in measuring O horizons. JCW 12/21
ADDITIONAL DATA: NSSL Lab No. 76P0706-09 is for typical pedon.
National Cooperative Soil Survey
U.S.A.