LOCATION KENN OK+AREstablished Series
TAXONOMIC CLASS: Fine-loamy, siliceous, active, thermic Ultic Hapludalfs
TYPICAL PEDON: Kenn loam, on a 2 percent slope, in pasture. (Colors are for moist soil unless otherwise stated.)
A--0 to 18 cm (0 to 7 in); dark brown (10YR 3/3) loam; weak fine granular structure; friable; fragments of sandstone make up 5 percent by volume; strongly acid; gradual wavy boundary. (10 to 28 cm (4 to 11 in) thick)
Bt--18 to 74 cm (7 to 29 in); yellowish red (5YR 4/6) clay loam; weak fine subangular blocky structure; friable; fragments of sandstone make up 10 percent by volume; clay films on faces of peds; very strongly acid; clear irregular boundary. (30 to 86 cm (12 to 34 in) thick)
2BC--74 to 114 cm (29 to 45 in); brown (7.5YR 4/4) very gravelly clay loam; weak fine subangular blocky structure; friable; fragments of sandstone make up 50 percent by volume; thin patchy clay films on faces of peds; very strongly acid; gradual wavy boundary. (13 to 64 cm (5 to 25 in) thick)
2C--114 to 178 cm (45 to 70 in); dark yellowish brown (10YR 4/4) extremely cobbly loam; massive; friable; fragments of sandstone make up 85 percent by volume; very strongly acid.
TYPE LOCATION: LeFlore County, Oklahoma; about 3 miles northwest of Wister, Oklahoma; 600 feet south and 600 feet west of the northeast corner of sec. 10, T. 6 N., R. 24 E.
RANGE IN CHARACTERISTICS: Solum thickness is 102 to 152 cm (40 to 60 in). Depth to the gravelly 2BC ranges from 51 to 102 cm (20 to 40 in). Depth to bedrock is greater than 152 cm (60 in).
A horizon:
Hue: 7.5YR or 10YR
Value: 3 or 4
Chroma: 2 to 4.
Texture: loam, very fine sandy loam, or fine sandy loam in the fine earth fraction, and includes gravelly and cobbly analogs.
Rock Fragments: 0 to 35 percent sandstone and/or novaculite less than 10 inches in diameter. About 0 to 35 percent by volume is less than 76 mm in diameter and 0 to 10 percent by volume is more than 76 mm in diameter.
Reaction: slightly acid to strongly acid, except where amendments have been applied.
BA or BE horizon (where present):
Hue: 7.5YR
Value: 4 or 5
Chroma: 4 or 6
or Hue: 10YR
Value: 4 to 6
Chroma: 3 or 4
or Hue: 10YR
Value: 5 or 6
Chroma: 6 or 8
Texture: loam, fine sandy loam, very fine sandy loam, or their gravelly or cobbly analogs.
Rock Fragments: 0 to 35 percent sandstone and/or novaculite less than 10 inches in diameter. About 0 to 35 percent by volume is less than 76 mm in diameter and 0 to 10 percent by volume is more than 76 mm in diameter.
Reaction: moderately acid to strongly acid.
Bt horizon(s):
Hue: 5YR or 7.5YR
Value: 4 or 5
Chroma: 3 to 8
or Hue: 10YR
Value: 4 to 6
Chroma: 3 or 4
or Hue: 10YR
Value: 5 or 6
Chroma: 6 or 8
Texture: clay loam, sandy clay loam, loam, or their gravelly analogs.
Rock Fragments: 0 to 35 percent sandstoneor novaculite less than 10 inches in diameter. About 0 to 35 percent by volume is less than 76 mm in diameter and 0 to 10 percent is more than 76 mm in diameter.
Reaction: strongly acid or very strongly acid.
2BC horizon:
Hue: 5YR or 7.5YR
Value: 4 or 5
Chroma: 3 to 8
or Hue: 10YR
Value: 4 to 6
Chroma: 3 or 4
or Hue: 10YR
Value: 5 or 6
Chroma: 6 or 8
Texture: loam, clay loam or sandy clay loam in the fine earth fraction, and is restricted to very gravelly, cobbly, very cobbly, or stony analogs.
Rock Fragments: 35 to 90 percent sandstone and/or novaculite less than 10 inches in diameter. About 35 to 60 percent by volume is less than 76 mm in diameter and 0 to 40 percent by volume is more than 76 mm in diameter.
Reaction: strongly acid or very strongly acid.
2C horizon:
Hue: 7.5YR or 10YR
Value: 4 or 5
Chroma: 3 to 6
Texture: loam or fine sandy loam in the fine earth fraction, and is restricted to extremely gravelly, extremely cobbly, and very stony analogs.
Rock Fragments: 60 to 90 percent sandstone and/or novaculite less than 10 inches in diameter. About 35 to 75 percent by volume is less than 76 mm in diameter and 10 to 50 percent by volume is more than 76 mm diameter.
Reaction: strongly acid to extremely acid.
COMPETING SERIES: These are the
Kenefick,
Speer, and
Wiville series in the same family.
Kenefick soils occur in another MLRA, have sola greater than 80 inches thick, and do not have a lithologic disontinuity.
Speer soils have less than 10 percent coarse fragments in the BC and C horizons, and do not have a lithologic discontinuity.
iville soils occur in another MLRA, have sola greater than 60 inches, do not have a lithologic discontinuity, and formed in eolian deposits.
GEOGRAPHIC SETTING: Kenn soils are on nearly level to gently sloping flood plains of the Ouachita Mountains, MLRA 119, and the Arkansas Valley and Ridges, MLRA 118. They have formed in loamy alluvium. Slope ranges from 0 to 4 percent but is commonly 0 to 2 percent. These soils are subject to flooding for very brief periods mainly during January to July. Mean annual precipitation ranges from 40 to 56 inches. Mean annual temperature ranges from 60 degrees to 65 degrees F. Thornthwaite annual P-E indices are greater than 64.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing
Speer series and the
Avilla,
Carnasaw,
Ceda,
Cupco,
Dela,
Neff,
Rexor,
Wetsaw, and
Wilburton series. Avilla soils occur on higher terrace positions, have sola greater than 60 inches, and have lower base saturation.
Carnasaw soils are on the adjacent mountains, have a clayey control section, and are underlain with shale at depths of 40 to 60 inches.
Ceda soils commonly occur upstream and closer to the source of sediments and have a loamy-skeletal control section.
Cupco soils are in level to slightly concave positions, are very poorly drained, and are in a fine-silty textural class.
Dela soils occur closer to the stream channel, do not have an argillic horizon, and are in a coarse-loamy textural class.
Neff soils are somewhat poorly drained and have fine-silty control section.
Neff, Rexor, and Speer soils commonly occur downstream and farther from the source of sediments.
Wetsaw soils occur are benches and terraces, have a clayey lower Bt formed in shale residuum, and are in an Aquic subgroup.
Wilburton soils occur on non-flooded alluvial and colluvial positions, have more than 35 percent rock fragments in the control section, and do not have a lithologic discontinuity.
DRAINAGE AND PERMEABILITY: Kenn soils are well drained. Runoff is slow to medium and permeability is moderate.
USE AND VEGETATION: Used mainly for tame pasture and woodland. The vegetation is primarily post oak, southern red oak, sweetgum, and shortleaf pine.
DISTRIBUTION AND EXTENT: Flood plains of the Ouachita Mountains and the Arkansas Valley and Ridges of Arkansas and Oklahoma. The series is of minor extent
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Latimer County, Oklahoma; 1980.
REMARKS: These soils were formerly included in the Ceda series.
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