LOCATION FELKER OK+AR TXEstablished Series
TAXONOMIC CLASS: Fine-silty, siliceous, active, thermic Aquic Paleudults
TYPICAL PEDON: Felker loam -- on a west facing slope of 1 percent -- forested. (Colors are for moist soil unless otherwise stated.)
A--0 to 2 inches; very dark grayish brown (10YR 3/2) loam; weak fine granular structure; very friable; medium acid; clear smooth boundary. (2 to 7 inches thick)
E--2 to 10 inches; pale brown (10YR 6/3) silt loam; weak fine granular structure; very friable; many fine and common coarse roots; few organic stains; medium acid; clear smooth boundary. (4 to 9 inches thick)
Bt1--10 to 26 inches; light yellowish brown (10YR 6/4) silt loam; many fine faint light brownish gray redox depletions and dark brown redox iron concentrations; weak and moderate fine subangular blocky structure; friable; common thin discontinuous clay films on faces of peds and within pores; strongly acid; gradual smooth boundary. (8 to 20 inches thick)
Bt2--26 to 43 inches; yellowish brown (10YR 5/6) silt loam; many medium and coarse faint light brownish gray (10YR 6/2) redox depletions and pale brown (10YR 6/3) redox iron concentrations; weak fine and medium subangular blocky structure; friable; few fine and medium pores; patchy clay films on faces of peds and bridging sand grains; strongly acid; gradual smooth boundary. (9 to 24 inches thick)
Btg1--43 to 51 inches; light brownish gray (10YR 6/2) silt loam; many medium and coarse faint light yellowish brown (10YR 6/4) and prominent yellowish red (5YR 5/6) redox iron concentrations; weak medium subangular blocky structure; friable; slightly brittle; peds coated with sand and silt grains; patchy clay films on faces of peds and bridging sand grains; very strongly acid; gradual smooth boundary. (8 to 30 inches thick)
Btg2--51 to 70 inches; coarsely mottled gray (10YR 6/1) (redox depletions), yellowish brown (10YR 5/4) (redox iron concentrations), and pale brown (10YR 6/3) (redox iron concentrations) silty clay loam; weak medium subangular blocky structure; friable; streaks and pockets of light gray (10YR 7/2) and light brownish gray (10YR 6/2) clay depletions; patchy clay films on faces of peds and bridging sand grains; very strongly acid.
TYPE LOCATION: McCurtain County, Oklahoma; at north edge of Haworth, Oklahoma; about 600 feet west and 100 feet south of the northeast corner of sec. 23, T. 8 S., R. 25 E.
RANGE IN CHARACTERISTICS: Solum thickness is more than 60 inches.
The A horizon has hue of 10YR, value of 3 to 5, and chroma of 2 or 3. Texture is loam, silt loam, or very fine sandy loam. Reaction ranges from very strongly acid to medium acid.
The E horizon has hue of 10YR, value of 5 or 6, and chroma of 3 or 4. Texture and reaction are similar to the A horizon.
The Bt horizon has hue of 10YR, value of 5 or 6, and chroma of 3 to 8. Redox depletions and concentrations are in shades of gray, red, brown, or yellow. Texture is loam, silt loam, or silty clay loam. Clay content ranges from 18 to 30 percent, and silt content is more than 30 percent. Reaction ranges from very strongly acid to medium acid.
The Btg1 horizon has hue of 10YR, value of 5 or 6, chroma of 1 to 8. Redox depletions and concentrations are in shades of gray, red, brown, or yellow. Texture, clay content, and reaction are similar to the Bt1 horizon. Uncoated sand grains and silt coatings on ped faces are common.
The Btg2 horizon is coarsely mottled. Redox depletions and concentrations are in shades of gray, brown, or yellow. Texture, clay content, and reaction are similar to the Bt horizon. Some pedons have silty clay or clay textures below 60 inches. Streaks and pockets of uncoated sand grains are common. Silt coatings are present on faces of peds in some pedons.
COMPETING SERIES: These are the Exum and Sawyer series in the same family. Exum soils do not have uncoated sand grains and silt coatings on ped faces of the Bt horizons. Sawyer soils have more clayey lower Bt horizons. In addition, Exum soils have a small amount of plinthite in the lower part.
GEOGRAPHIC SETTING: Felker soils are on nearly level or very gently sloping flats of uplands in the Western Coastal Plains. Slopes range from 0 to 3 percent. They formed in Quaternary aged loamy alluvium that is high in silt. Climate is humid. Mean annual precipitation ranges from 40 to 50 inches. Mean annual temperature ranges from 62 to 65 degrees F. Thornthwaite annual P-E indices are greater than 64. Felker soils receive an average total rainfall of 10.2 inches during the months of July through September.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Elysian, Guyton, Kinta, Kullit, and Tomast soils. Elysian soils have coarse-loamy control sections, have a base saturation of more than 35 percent, and occur on mounded areas. Guyton soils have a base saturation of more than 35 percent, and they occur on slightly lower areas. Kinta soils have clayey control sections and occur on similar areas. Kullit soils have a coarse-loamy control section and occur on similar areas. Tomast soils have Bt horizons with dominant chromas of 2 or less and occur on similar areas.
DRAINAGE AND PERMEABILITY: Felker soils are somewhat poorly drained; runoff is very slow; and permeability is moderately slow. A water table is between 2 and 3 feet of the soil surface during the months of November through March.
USE AND VEGETATION: Used mainly for woodland. Some areas have been cleared and are used for tame pasture or cultivated to grain sorghum, cotton, soybeans, or corn. Native vegetation is shortleaf pine, sweetgum, water oak, and loblolly pine.
DISTRIBUTION AND EXTENT: Western Coastal Plains (MLRA 133B) of Oklahoma and possibly Arkansas, Louisiana, and Texas. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: McCurtain County, Oklahoma; 1970.
REMARKS:Diagnostic horizons and features recognized in this pedon are:
Diagnostic horizons and features in this pedon are:
Ochric epipedon - the zone from the surface of the soil to a depth of approximately 10 inches (A and E horizons).
Albic horizon - the zone from approximately 2 to 10 inches (E horizon).
Argillic horizon - the zone from approximately 10 to 70 inches (Bt1, Bt2, Btg1, and Btg2 horizons).
Aquic features - have mottles with chroma of 2 or less in the zone from 10 to 34 inches (Bt1 and Bt2 horizons) and the mottled horizon is saturated with water at some period of time.
Pale features - the zone from 10 to 60 inches (Bt1, Bt2, Btg1, and Btg2 horizons) does not decrease in clay content by as much as 20 percent from the maximum.
ADDITIONAL DATA: National Soil Survey Laboratory; lab samples S62-OK-45-1 and S62-OK-45-2.
Soil Interpretations Record: Felker Series OK0155