LOCATION RENTHIN OKEstablished Series
TAXONOMIC CLASS: Fine, mixed, superactive, thermic Udertic Argiustolls
TYPICAL PEDON: Renthin silt loam-native hay meadow. (Colors are for dry soil unless otherwise stated.)
A--0 to 4 inches; brown (7.5YR 4/2) silt loam, dark brown (7.5YR 3/2) moist; weak medium platy structure parting to weak fine granular; hard, friable; many very fine and few fine roots; many very fine and fine pores; neutral; clear smooth boundary. (4 to 10 inches thick)
BA--4 to 10 inches; brown (7.5YR 4/2) clay loam, dark brown (7.5YR 3/2) moist; weak fine subangular blocky structure parting to moderate fine granular; very hard, firm; many very fine and few fine roots; many very fine and fine pores; common worm casts; slightly acid; clear smooth boundary. (0 to 6 inches thick)
Bt1--10 to 15 inches; reddish brown (5YR 4/3) clay, dark reddish brown (5YR 3/3) moist; weak medium prismatic structure parting to moderate fine subangular blocky; very hard, very firm; many very fine and few fine roots; common very fine and fine pores; common distinct discontinuous clay films on vertical faces; slightly acid; gradual smooth boundary. (4 to 20 inches thick)
Bt2--15 to 22 inches; reddish brown (2.5YR 4/4) clay, dark reddish brown (2.5YR 3/4) moist; moderate medium prismatic structure parting to moderate medium blocky; extremely hard, extremely firm; many very fine and few fine roots; many very fine and common fine pores; common distinct continuous clay films on vertical and horizontal faces; vertical cracks filled with A horizon material; slightly acid; clear wavy boundary. (0 to 20 inches thick)
Btss--22 to 29 inches; red (2.5YR 4/6) clay, dark red (2.5YR 3/6) moist; moderate medium prismatic structure parting to strong medium blocky; extremely hard, extremely firm; common very fine and few fine roots; few very fine and fine pores; common slickensides; common distinct continuous clay films on vertical and horizontal faces; neutral; gradual wavy boundary. (0 to 20 inches thick)
Btkss--29 to 42 inches; red (2.5YR 4/6) clay, dark red (2.5YR 3/6) moist; weak coarse prismatic structure parting to strong medium blocky; extremely hard, extremely firm; common very fine roots; few very fine and fine pores; common slickensides; common distinct continuous clay films on vertical and horizontal faces 30 percent by volume; common calcium carbonate masses; few fine and medium calcium carbonate concretions; few fine and medium black concretions 2 percent by volume; slightly alkaline; gradual wavy boundary. (6 to 38 inches thick)
Btk--42 to 55 inches; red (2.5YR 5/6) clay loam, red (2.5YR 4/6) moist; weak coarse prismatic structure parting to moderate medium blocky; very hard, very firm; few very fine roots; common very fine and few fine pores; few distinct continuous clay films on vertical faces; few medium calcium carbonate soft masses; few medium calcium carbonate concretions; fine and medium black concretions 10 percent by volume; moderately alkaline; clear wavy boundary. (6 to 38 inches thick)
Cr1--55 to 66 inches; reddish brown (2.5YR 4/4), red (2.5YR 5/6), and pale yellow (2.5Y 7/4) laminated shale, sandstone, and siltstone, dark reddish brown (2.5YR 3/4), red (2.5YR 4/6), and light yellowish brown (2.5Y 6/4) moist; hard; very few very fine roots in fractures; strongly alkaline; clear wavy boundary. (0 to 11 inches thick)
Cr2--66 to 77 inches; red (2.5YR 5/6) and light gray (2.5Y 7/2) very fine grained sandstone, red (2.5YR 4/6) and light brownish gray (2.5Y 6/2) moist; hard; strongly alkaline.
TYPE LOCATION: Oklahoma County, Oklahoma; about 2 miles east and 1/2 mile north of Britton, Oklahoma; about 2500 feet north and 1500 feet east of the southwest corner of sec. 26, T. 13 N., R. 3 W.
RANGE IN CHARACTERISTICS: Solum thickness and depth to bedrock ranges from 40 to 60 inches. Depth to secondary carbonates ranges from 19 to 52 inches. It has cracks within 125 cm of the mineral soil surface that are 5 mm or more wide through a thickness of 30 cm or more for some time in most years, and slickensides or wedge shaped aggregates in a layer 15 cm or more thick that has its upper boundary within 125 cm of the mineral soil surface, or a linear extensibility of 6.0 cm or more between the mineral soil surface and either a depth of 100 cm or a paralithic contact. The clay content is greater than 35 percent within a depth of 15 inches. Electrical conductivity of the saturation extract ranges from 0 to 1 mmhos/cm.
The A horizon or Ap horizon has hue of 5YR or 7.5YR, value of 4 or 5, and chroma of 2 or 3. Texture is typically silt loam, but silty clay loam and clay loam are common in cultivated areas. Reaction ranges from slightly acid to neutral.
The BA horizon has hue of 2.5YR to 7.5YR, value of 4 or 5, and chroma of 2 to 4. Texture is silty clay loam or clay loam. This horizon is absent in most cultivated areas where moderate erosion has removed much of the original A horizon and this horizon is mixed with the A horizon and now designated as an Ap horizon. Reaction ranges from slightly acid to slightly alkaline.
The Bt1 horizon has hue of 2.5YR or 5YR, value of 4 or 5, and chroma of 3 to 6. Dark soil materials in vertical streaks occur in some pedons as a result of cracking. Texture is silty clay loam, silty clay, or clay. Clay content ranges from 35 to 45 percent. Some pedons have slickensides. Reaction ranges from slightly acid to moderately alkaline. Most pedons are noneffervescent.
The Bt2 horizon has hue of 2.5YR or 5YR, value of 4 to 6, and chroma of 4 to 6. Dark soil materials in vertical streaks occur in some pedons as a result of cracking. Texture is silty clay or clay. Clay content ranges from 40 to 55 percent. Some pedons have slickensides. Reaction is slightly acid to moderately alkaline. Some pedons are slightly effervescent.
The Btss horizon has hue of 2.5YR or 5YR, value of 4 to 6, and chroma of 4 to 6. Dark soil materials in vertical streaks occur in some pedons as a result of cracking. Texture is silty clay or clay. Clay content ranges from 40 to 55 percent. Slickensides occur in most pedons. Reaction is slightly acid to moderately alkaline. Some pedons are slightly effervescent.
The Btkss horizon has hue of 2.5YR or 5YR, value of 4 or 5, and chroma of 4 to 8. Dark soil materials in vertical streaks occur in some pedons as a result of cracking. Texture is silty clay loam, silty clay, or clay. Clay content ranges from 35 to 55 percent. Slickensides occur in most pedons. Calcium carbonate occurs as masses or threads, and as concretions. Sodium adsorption ratio ranges from 0 to 1. Reaction is slightly alkaline or moderately alkaline.
The Btk horizon has hue of 2.5YR or 5YR, value of 4 or 5, and chroma of 4 to 8. Dark soil materials in vertical streaks occur in some pedons as a result of cracking. Texture is silty clay loam, clay loam, silty clay, or clay. Clay content ranges from 35 to 55 percent. Slickensides occur in some pedons. Calcium carbonate occurs as masses, threads, or concretions. Sodium adsorption ratio ranges from 0 to 2. Reaction is moderately alkaline.
The BC horizon, where present, has hue of 2.5YR or 5YR, value of 4 or 5, and chroma of 4 to 8. Dark soil materials in vertical streaks occur in some pedons as a result of cracking. Texture is silty clay loam, clay loam, silty clay, or clay. Clay content ranges from 35 to 55 percent. Shale fragments of 2mm to 76mm in diameter size range from 0 to 35 percent by volume. Sodium adsorption ratio ranges from 0 to 2. Reaction is moderately alkaline.
The Cr horizons have hue of 2.5YR, value of 4 to 6, and chroma of 4 to 8. Some pedons have streaks or rounded splotches in hue of 10YR or 2.5Y, value of 5 to 7, and chroma of 2 to 4. The shale is effervescent in most pedons, but some are only effervescent in seams or fractures. Sodium adsorption ratio ranges from 0 to 8. This material is non paralithic with low to moderate excavation difficulty. Fractures are greater than 10 cm apart. Most of this material slakes in water within 15 hours.
COMPETING SERIES: These are the Brewer, Brewless, Dilworth, Piedmont, Westsum and Wetbeth series. The Brewer and Brewless soils are very deep and are on flood plains. The Dilworth and Piedmont soils have solum 20 to 40 inches thick over bedrock. The Westsum and Wetbeth soils are very deep. In addition Wetbeth soils developed in alluvium.
GEOGRAPHIC SETTING: Renthin soils are on very gently sloping to gently sloping, broad and smooth convex ridges and side slopes of uplands in the Central Rolling Red Prairies (MLRA-80A). Slopes range from 1 to 5 percent. These soils formed in material weathered from clayey and silty shale of Permian age. The climate is dry or moist subhumid. Mean Annual Precipitation: 26 to 38 inches. Mean Annual Temperature: 58 to 63 degrees F. Thornthwaite Annual P-E indices: 44 to 64. The frost free period ranges from 200 to 230 days. Elevation ranges from 700 to 1600 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bethany, Grainola, Grant, Huska, Kingfisher, Kirkland, Lucien, Norge, Piedmont, Renfrow, and Zaneis series. Bethany and Kirkland soils on higher positions, Norge soils on lower positions and Renfrow soils on higher positions have a solum more than 60 inches thick. They also have an argillic horizon that does not decrease in clay content by more than 20 percent at a depth of 60 inches. In addition, Bethany and Kirkland soils have a mollic epipedon more than 20 inches thick and Norge soils have a fine-silty control section. Grainola soils do not have a mollic epipedon and Kingfisher soils have a fine-silty control section. Grant soils on similar landscapes, have a fine-silty control section. Huska soils on similar landscapes do not have a mollic epipedon and have a natric horizon. Lucien soils on lower positions, have a solum 10 to 20 inches thick and have a loamy control section. Piedmont soils occur on similar landscapes, but at lower elevations near drainage channels. Zaneis soils on similar landscapes, have a fine-loamy control section and do not have secondary calcium carbonate accumulations.
DRAINAGE AND PERMEABILITY: Well drained; very slow permeability; runoff is very high.
USE AND VEGETATION: Most areas are cultivated to wheat or other small grains; lesser amounts are in grain sorghum or hybrid forage sorghums. Some old fields have been sprigged to bermudagrass or seeded to old world bluestems and used for hay or tame pasture. Native vegetation consists mostly of tall and mid grasses.
DISTRIBUTION AND EXTENT: Central Rolling Red Prairies (MLRA 80A) of Oklahoma. The series is of moderate extent.
MLRA OFFICE RESPONSIBLE: Temple, Texas.
SERIES ESTABLISHED: Logan County, Oklahoma 1994.
REMARKS: This series was formally included in the Renfrow, Vernon, and Zaneis series in earlier surveys. The name Renthin was coined from the Renfrow series and the word thin, since this series differs only in solum thickness from the Renfrow series.
Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the surface of the soil to a depth of approximately 15 inches (A, BA, and Bt1 horizons).
Argillic horizon - The zone approximately from 10 to 55 inches (Bt horizons). Accumulation of calcium carbonate - the zone from 29 inches to 55 inches (Bk horizons). Ustolls - Moisture control section dry in some part more than 90 days.
Udertic - Cracks within 125 cm of the mineral soil surface that are 5 mm or more wide through a thickness of 30 cm or more for some time in most years, and slickensides or wedge shaped aggregates in a layer 15 cm or more thick that has its upper boundary within 125 cm of the mineral soil surface, or a linear extensibility of 6.0 cm or more between the mineral soil surface and either a depth of 100 cm or a paralithic contact, which ever is shallower.
Cr horizon - the non paralithic rock like material encountered at a depth of 55 inches.
Soil Interpretation Record: OK0346 Renthin Series
ADDITIONAL DATA: Lab data from NSSL - S91OK-109-001, complete characterization.