LOCATION BOBTOWN INEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, active, mesic Aquultic Hapludalfs
TYPICAL PEDON: Bobtown loamy fine sand, on a nearly level, convex slope in a cultivated field. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 23 cm (0 to 9 inches); dark yellowish brown (10YR 4/4)) loamy fine sand, light yellowish brown (10YR 6/4) dry; weak fine subangular blocky structure parting to weak fine granular; very friable; common fine and very fine roots; strongly acid; abrupt wavy boundary. [13 to 28 cm (5 to 11 inches) thick]
E--23 to 33 cm (9 to 13 inches); yellowish brown (10YR 5/6) fine sandy loam; weak fine subangular blocky structure parting to weak fine granular; very friable; few very fine roots; strongly acid; clear wavy boundary. [5 to 13 cm (2 to 5 inches) thick]
EB--33 to 51 cm (13 to 20 inches); yellowish brown (10YR 5/6) fine sandy loam; weak medium subangular blocky structure; friable; few very fine roots; common fine brown (10YR 4/3) iron stains; few fine black (N 2.5/) masses of iron and manganese oxides; strongly acid; clear wavy boundary. [0 to 20 cm (0 to 8 inches) thick]
Bt1--51 to 74 cm (20 to 29 inches); strong brown (7.5YR 5/8) fine sandy loam; moderate medium and fine subangular blocky structure; firm; few very fine roots; thin discontinuous yellowish brown (10YR 5/4) clay films on faces of peds; few fine black (N 2.5/) masses of iron and manganese oxides; common fine prominent light gray (10YR 7/2) iron depletions; very strongly acid; gradual wavy boundary.
Bt2--74 to 96 cm (29 to 38 inches); yellowish brown (10YR 5/4) sandy clay loam; weak medium and coarse subangular blocky structure; firm; few very fine roots; thin discontinuous pale brown (10YR 6/3) clay films on faces of peds; common medium prominent strong brown (7.5YR 5/8) masses of iron accumulation; few fine black (N 2.5/) masses of iron and manganese oxides; many medium distinct light gray (10YR 7/2) and few medium distinct gray (10YR 6/1) iron depletions; very strongly acid; gradual wavy boundary.
Bt3--96 to 132 cm (38 to 52 inches); pale brown (10YR 6/3) fine sandy loam; weak coarse subangular blocky structure; very friable; few very fine roots; clay bridging between sand grains; many medium prominent strong brown (7.5YR 5/8) masses of iron accumulation; common fine black (N 2.5/) and strong brown (7.5YR 4/6) masses of iron and manganese oxides; many coarse faint light gray (10YR 7/2) iron depletions; very strongly acid; gradual wavy boundary. [Combined thickness of the Bt horizon is 43 to 99 cm (17 to 39 inches).]
BC--132 to 155 cm (52 to 61 inches); pale brown (10YR 6/3) loamy sand; massive; very friable; many fine black (N 2.5/) masses of iron and manganese oxides; many medium faint light gray (10YR 7/2) iron depletions; very strongly acid; gradual wavy boundary. [10 to 33 cm (4 to 13 inches) thick]
C--155 to 203 cm (6l to 80 inches); yellowish brown (10YR 5/4) stratified loamy sand, loamy fine sand, and fine sand; massive; very friable; common medium distinct strong brown (7.5YR 5/6) masses of iron accumulation; many coarse distinct light gray (10YR 7/2) and common medium faint pale brown (10YR 6/3) iron depletions; strongly acid.
TYPE LOCATION: Jackson County, Indiana; about l.5 miles east of Seymour; 60 feet south and 1120 feet west of the center of sec. l5, T. 6 N., R. 6 E.
RANGE IN CHARACTERISTICS:
Thickness of the solum: 122 to 178 cm (48 to 70 inches)
Particle-size control section: averages 18 to 26 percent clay
Ap horizon:
Hue: l0YR
Value: 4 or 5
Chroma: 3 or 4
Texture: loamy fine sand
Reaction: very strongly acid to slightly acid
E, EB horizon:
Hue: 10YR
Value: 4 to 7
Chroma: 4 to 8
Texture: fine sandy loam or loamy fine sand
Reaction: very strongly acid to moderately acid
Bt horizon:
Hue: 7.5YR or 10YR
Value: 5 to 7
Chroma: 3 to 8
Texture: sandy clay loam or fine sandy loam
Reaction: very strongly acid or strongly acid
BC horizon:
Hue: 10YR
Value: 5 to 7
Chroma: 3 to 6
Texture: loamy sand or loamy fine sand
Reaction: very strongly acid or strongly acid
C horizon:
Hue: l0YR
Value: 5 to 7
Chroma: 3 to 6
Texture: stratified loamy sand, loamy fine sand, or fine sand; dominantly fine sand below 203 cm (80 inches)
Reaction: very strongly acid to moderately acid
COMPETING SERIES: These are the Coshocton and Sycoline series. Coshocton soils contain rock fragments of shale, siltstone, or sandstone within the series control section. Sycoline soils have a lithic contact within a depth of 102 cm (40 inches).
GEOGRAPHIC SETTING: Bobtown soils are on nearly level to gently sloping uplands. Slope ranges from 0 to 3 percent. The soils formed in eolian deposits. Mean annual precipitation ranges from 1016 to 1118 mm (40 to 44 inches). Mean annual air temperature ranges from 11 to 13 degrees C (52 to 55 degrees F).
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Alvin, Ayrshire, Bloomfield, Lyles, and Princeton soils. The somewhat poorly drained Ayrshire soils and the very poorly drained Lyles soils are in lower lying positions. The well drained Alvin and Princeton soils and the somewhat excessive drained Bloomfield soils are on higher lying convex slopes.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Moderately well drained. The depth to the top of an intermittent apparent high water table ranges from 15 cm to 61 cm (0.5 to 2.0 feet) between December and April in normal years. The potential for surface runoff is negligible or very low. Saturated hydraulic conductivity is moderately high to very high. Permeability is moderate to rapid. Available water capacity is moderate.
USE AND VEGETATION: Most areas of Bobtown soils are cultivated. Corn and soybeans are the principal crops. A few areas are used for hay and pasture. Native vegetation is mixed hardwoods with oaks, elm, maple, and tulip poplar as the major species.
DISTRIBUTION AND EXTENT: South-central Indiana; MLRA 114A. The series is of small extent.
MLRA OFFICE RESPONSIBLE: Indianapolis, Indiana.
SERIES ESTABLISHED: Jackson County, Indiana, l985.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: from the surface to a depth of 51 cm (Ap, E, EB horizons).
Argillic horizon: from a depth of 51 to 132 cm (Bt horizon).
Aquic conditions: iron depletions in all horizons below a depth of 51 cm.
ADDITIONAL DATA: Laboratory data Purdue Soils Laboratory number S79IN7l-6-(l-9).