LOCATION COYLE OKEstablished Series
TAXONOMIC CLASS: Fine-loamy, siliceous, active, thermic Udic Argiustolls
TYPICAL PEDON: Coyle loam--rangeland. (Colors are for dry soil unless otherwise stated.)
A--0 to 11 inches; dark reddish gray (5YR 4/2) loam, dark reddish brown (5YR 3/2) moist; strong fine granular structure; slightly hard, friable; many fine roots; slightly alkaline, clear smooth boundary. (6 to 14 inches thick)
BA--11 to 14 inches; reddish brown (5YR 4/3) loam, dark reddish brown (5YR 3/3) moist; moderate medium granular structure; slightly hard, friable; many fine roots; many fine pores; many wormcasts; slightly alkaline; clear smooth boundary. (0 to 8 inches thick)
Bt1--14 to 31 inches; red (2.5YR 5/6) clay loam, red (2.5YR 4/6) moist; moderate medium subangular blocky structure; hard, firm; common fine roots; thin nearly continuous clay films on faces of peds; neutral; gradual smooth boundary. (7 to 19 inches thick)
Bt2--31 to 39 inches; light red (2.5YR 6/8) sandy clay loam, red (2.5YR 5/8) moist; weak coarse subangular blocky structure; hard, firm; common fine roots; few coarse fragments of sandstone less than 76 mm in diameter; patchy clay films on faces of peds; neutral; abrupt smooth boundary. (0 to 16 inches thick)
Cr--39 to 42 inches; red (2.5YR 5/6) sandstone; can be augured when moist.
TYPE LOCATION: Payne County, Oklahoma; about 6 miles south and 3 miles west of Stillwater; 70 feet north and 460 feet west of the southeast corner of sec. 17, T. 18 N., R. 2 E.
RANGE IN CHARACTERISTICS: Solum thickness and depth to sandstone bedrock ranges from 20 to 40 inches. Reaction ranges from moderately acid to slightly alkaline in all horizons.
The A or Ap horizon has hue of 5YR to 10YR, value of 4 or 5, and chroma of 2 or 3. Texture is fine sandy loam or loam.
The BA horizon has hue of 5YR or 7.5YR, value of 4 or 5, and chroma of 2 to 4. Texture is loam or fine sandy loam.
The Bt1 horizon has hue of 2.5YR to 7.5YR, value of 4 to 6, and chroma of 3 to 6. Some pedons have redoximorphic concentrations in shades of red or brown. Texture is clay loam, loam, or sandy clay loam. Coarse fragments of sandstone less than 76 mm in diameter range from 0 to 10 percent by volume.
The Bt2 horizon has hue of 2.5YR to 7.5YR, value of 4 to 6, and chroma of 4 to 8. Some pedons have redoximorphic concentrations in shades of yellow, red, or brown. The texture is clay loam, fine sandy loam, loam, or sandy clay loam. Channery, flaggy, and gravelly modifiers are recognized. Coarse fragments of sandstone range from 0 to 35 percent by volume. About 0 to 30 percent by volume is less than 76 mm in diameter and 0 to 30 percent by volume is more than 76 mm in diameter.
Some pedons have a Bt3 horizon that ranges from 0 to 10 inches thick. It is similar to the Bt2 horizon in color, texture, and reaction.
Some pedons have a BC horizon with hue of 2.5YR to 7.5YR, value of 4 to 6, and chroma of 4 to 8. Texture is clay loam, loam, fine sandy loam, very fine sandy loam, or gravelly loam.
The Cr horizon has hue of 2.5YR to 10YR, value of 5 or 6, and chroma of 4 to 8. This material is paralithic with a high excavation difficulty. Fractures are greater than 10 cm apart. The material is dense enough that it is root restrictive. Most of this material slakes in water within 15 hours.
COMPETING SERIES: Zaneis is the only series in the same family. Zaneis, soils have a solum more than 40 inches thick.
GEOGRAPHIC SETTING: Coyle soils are on slightly convex, very gently sloping or gently sloping summits, shoulder slopes and back slopes of uplands in the Central Rolling Red Prairies. Slopes range from 1 to 12 percent. These soils formed in material weathered from sandstone of Permian age. Mean Annual Precipitation: 26 to 40 inches. Mean Annual Temperature: 58 to 64 degrees F. Thornthwaite Annual P-E indices: 44 to 64. Frost free days range from 190 to 230. Elevation ranges from 700 to 1500 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Grainola, Lucien, Renfrow, Stephenville, and Zaneis series. Chickasha and Zaneis soils generally occur on side slopes below the Coyle soils, and have solum more than 40 inches thick. Grainola and Renfrow soils are usually on convex side slopes below the Coyle soils and have a fine control section. Lucien and Stephenville soils occur on similar landscapes. Lucien soils have a solum less than 20 inches thick over sandstone and lack Bt horizons. Stephenville soils lack a mollic epipedon and have base saturation by sum of cations of less than 75 percent in some part of the Bt horizon.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability; runoff is very low on 1 to 5 percent slopes, and low on 5 to 12 percent slopes.
USE AND VEGETATION: Mainly used for rangeland or improved pasture. Some areas are cultivated with small grains being the principal crop. Native vegetation is tallgrass prairie.
DISTRIBUTION AND EXTENT: Central Rolling Red Prairies (MLRA 80A) of Oklahoma. The series is not extensive.
MLRA OFFICE RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Payne County, Oklahoma; 1983.
REMARKS: These soils were formerly included in the Stoneburg series.
Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from the surface of the soil to a depth of 14 inches (A horizon).
Argillic horizon - the zone from 14 inches to a depth of 39 inches (Bt horizons).
Paralithic contact - the occurrence of paralithic material at 39 inches.
Cr horizon - the zone from 39 inches to 42 inches
ADDITIONAL DATA: Mineralogy data from NSSL, Lincoln, Nebraska. Lab number S80OK-60-9, S90OK-103-002, S91OK-083-001.