LOCATION CYRIL OKEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, thermic Cumulic Haplustolls
TYPICAL PEDON: Cyril fine sandy loam, cultivated. (Colors are for dry soil unless otherwise stated.)
Ap--0 to 12 inches; dark grayish brown (10YR 4/2) fine sandy loam, very dark brown (10YR 2/2) moist; weak fine and medium granular structure; slightly hard, very friable; calcareous; moderately alkaline; gradual smooth boundary. (10 to 26 inches thick)
A1--12 to 34 inches; gray (10YR 5/1) loam, very dark gray (10YR 3/1) moist; weak fine granular structure; slightly hard, very friable; few films and soft bodies of calcium carbonate; calcareous; moderately alkaline; gradual smooth boundary. (0 to 25 inches thick)
Bwk--34 to 48 inches; light brownish gray (10YR 6/2) loam, dark grayish brown (10YR 4/2) moist; weak granular structure; slightly hard, very friable; few films and soft bodies of calcium carbonate; calcareous; moderately alkaline; gradual smooth boundary. (10 to 30 inches thick)
BCk--48 to 60 inches; light brown (7.5YR 6/4) loam, brown (7.5YR 5/4) moist; weak granular structure; slightly hard, very friable; about 5 percent films and soft bodies of calcium carbonate; calcareous; moderately alkaline.
TYPE LOCATION: Caddo County, Oklahoma; about 5 miles southwest of Fort Cobb; 1,120 feet west and 90 feet south of the northeast corner of sec. 29, T. 7 N., R. 12 W.
RANGE IN CHARACTERISTICS: Thickness of the A horizon ranges from 20 to 40 inches. Texture throughout all horizons to a depth of 40 inches is loam or fine sandy loam.
The A horizon is very dark gray (10YR 3/1), dark gray (10YR 4/1), gray (10YR 5/1), very dark grayish brown (10YR 3/2), dark grayish brown (10YR 4/2), or grayish brown (10YR 5/2). The Ap horizon is slightly or moderately alkaline and some pedons are noncalcareous to 10 inches.
The Bwk horizon is very dark grayish brown (10YR 3/2), dark grayish brown (10YR 4/2), grayish brown (10YR 5/2), brown or dark brown (7.5YR 3/2, 4/2, 5/2, 4/4, 5/4; 10YR 4/3, 5/3), dark yellowish brown (10YR 4/4), yellowish brown (10YR 5/4), light brownish gray (10YR 6/2), brownish yellow (10YR 6/6), reddish yellow (7.5YR 6/6), or strong brown (7.5YR 5/6). It is calcareous with 1 to 5 percent films and soft bodies of calcium carbonate.
The BCk horizon is brown (10YR 5/3; 7.5YR 5/4), light brown (7.5YR 6/4), strong brown (7.5YR 5/6), reddish yellow (7.5YR 6/6, 7/6), light yellowish brown (10YR 6/4), or yellow (10YR 7/6). This horizon is similar in texture to the control section but some pedons are stratified with coarser or finer strata below 40 inches and contains 2 to 8 percent films and bodies of calcium carbonate.
COMPETING SERIES: This is the only series in the family. Similar series are the Bippus, Bosque, Fife, Gageby, Gowen, Kaski, Plevna, Pocasset, Sweetwater, and Waldeck. Bippus, Bosque, Fife, Gageby, Gowen, and Kaski soils average more than 18 percent clay in the 10 to 40 inch section. Plevna soils contain no visible segregated lime, are noncalcareous between 10 and 20 inch depths and have characteristics associated with wetness. Pocasset soils have a mollic epipedon less than 20 inches thick. Sweetwater soils have a water table within 30 inches of the soil surface and have characteristics associated with wetness. Waldeck soils have a mollic epipedon less than 20 inches thick and have charactertisics associated with wetness.
GEOGRAPHIC SETTING: Cyril soils are on nearly level flood plains of the eastern part of the central rolling red plains and central rolling red prairies. Slopes are 0 to 1 percent. The soil formed in calcareous loamy alluvium on flood plains that drain Permian and Pleistocene age sediments. Mean annual precipitation ranges from 25 to 40 inches. Mean annual temperature ranges from 60 degrees to 64 degrees F. Thornthwaite annual P-E indices range from 38 to 64. Frost free days range from 210 to 230. Elevation ranges from 800 to 1500 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Sweetwater series and the Port and Pulaski series. Sweetwater soils are on slightly lower concave areas. Port soils are on adjacent areas and have fine-silty control sections. Pulaski soils are on adjacent areas and are noncalcareous in the control section and are redder in color.
DRAINAGE AND PERMEABILITY: Cyril soils are well drained. Runoff is negligible and permeabiity is moderate. These soils are occasionally flooded for very brief periods during April to August.
USE AND VEGETATION: About one-half cultivted to grain sorghums, peanuts, cotton, small grains, tame pasture, and alfalfa. About one-half range used for grazing beef cattle. Native vegetation is bottomland hardwoods with an understory of tall grasses.
DISTRIBUTION AND EXTENT: Central rolling red plains or central rolling red prairies of Oklahoma and Texas. The soils of this series are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Caddo County, Oklahoma; 1970.
REMARKS: These soils were classified in the Alluvial great soil group.