LOCATION COBLEN OH

Established Series
Rev. TEL-SJH-JWH
11/2021

COBLEN SERIES

The Coblen series consists of very deep, moderately well drained soils formed in loamy alluvium on stream terraces. Slope ranges from 0 to 2 percent. Mean annual precipitation is about 965 mm (38 inches), and mean annual air temperature is about 11 degrees C (51 degrees F).

TAXONOMIC CLASS: Coarse-loamy, mixed, active, mesic Fluvaquentic Hapludolls

TYPICAL PEDON: Coblen loam, on a 1 percent slope in pasture. (Colors are for moist soil unless otherwise stated.)

Ap--0 to 28 cm (0 to 11 inches); very dark brown (10YR 2/2) loam, dark gray (10YR 4/1) dry; moderate fine and medium granular structure; friable; many fine and medium roots; 1 percent gravel; slightly alkaline; abrupt smooth boundary.

A--28 to 43 cm (11 to 17 inches); black (10YR 2/1) loam, very dark gray (10YR 3/1) dry; moderate medium and fine subangular blocky structure; friable; many fine and medium roots; few very fine strong brown (7.5YR 5/6) iron concretions throughout; 3 percent gravel; slightly alkaline; clear wavy boundary. [Combined thickness of the A horizon is 25 to 51 cm (10 to 20 inches).]

Bw1--43 to 53 cm (17 to 21 inches); brown (10YR 4/3) fine sandy loam; weak medium subangular blocky structure; friable; common fine and medium roots; common medium distinct yellowish brown (10YR 5/6) masses of iron accumulation on faces of peds; few very fine strong brown (7.5YR 5/6) iron concretions throughout; many medium black (10YR 2/1) and very dark gray (10YR 3/1) organic coatings on faces of peds and in root channels; many fine black (10YR 2/1) krotovina; 5 percent gravel; slightly alkaline; gradual wavy boundary.

Bw2--53 to 79 cm (21 to 31 inches); yellowish brown (10YR 5/4) fine sandy loam; weak fine and medium subangular blocky structure; friable; common fine and medium roots; common medium distinct dark grayish brown (10YR 4/2) iron depletions in the matrix; common medium distinct yellowish brown (10YR 5/6) masses of iron accumulation on faces of peds; few very fine strong brown (7.5YR 5/6) iron concretions throughout; common distinct very dark grayish brown (10YR 3/2) organic coatings in root channels; common fine black (10YR 2/1) krotovina; 3 percent gravel; slightly alkaline; clear wavy boundary.

Bw3--79 to 104 cm (31 to 41 inches); yellowish brown (10YR 5/4) sandy loam; weak medium subangular blocky structure; friable; common fine and medium roots; common medium distinct grayish brown (10YR 5/2) iron depletions in the matrix; few fine strong brown (7.5YR 5/6) iron concretions throughout; few distinct very dark grayish brown (10YR 3/2) organic coatings in root channels; few fine black (10YR 2/1) krotovina; 3 percent gravel; moderately alkaline; abrupt wavy boundary. [Combined thickness of the Bw horizon is 51 to 102 cm (20 to 40 inches).]

Bkg--104 to 124 cm (41 to 49 inches); dark gray (10YR 4/1) gravelly sandy loam; weak coarse subangular blocky structure; friable; few fine roots; many medium distinct gray (10YR 5/1) iron depletions in the matrix; many prominent strong brown (7.5YR 5/6) masses of iron accumulation in root channels; many prominent light gray (10YR 7/1) masses of calcium carbonate accumulation throughout; 20 percent gravel; strongly effervescent; moderately alkaline; clear wavy boundary. [0 to 38 cm (15 inches) thick]

Cg--124 to 180 cm (49 to 71 inches); grayish brown (10YR 5/2) gravelly sandy loam; massive; very friable; few fine strong brown (7.5YR 5/6) masses of iron accumulation throughout; 30 percent gravel; strongly effervescent; moderately alkaline; clear wavy boundary.

C--180 to 203 cm (71 to 80 inches); yellowish brown (10YR 5/4) extremely gravelly sandy loam; single grain; loose; 80 percent gravel; violently effervescent; strongly alkaline.

TYPE LOCATION: Clinton County, Ohio; about 1 mile west of Lumberton, in Liberty Township; about 1800 feet west of the intersection of McKay Road and New Burlington Road, along New Burlington Road then about 810 feet south; USGS Port William topographic quadrangle; lat. 39 degrees 33 minutes 24 seconds N. and long. 83 degrees 52 minutes 10 seconds W., NAD 27.

RANGE IN CHARACTERISTICS:
Thickness of the mollic epipedon: 25 to 51 cm (10 to 20 inches)
Depth to the base of the cambic horizon: 76 to 152 cm (30 to 60 inches)
Depth to carbonates: 76 to 152 cm (30 to 60 inches)

Ap or A horizon:
Hue: 10YR
Value: 2 or 3 (3 to 5 dry)
Chroma: 1 or 2
Texture: loam or silt loam
Rock fragment content: 0 to 5 percent
Reaction: neutral or slightly alkaline

Bw horizon:
Hue: 10YR
Value: 4 or 5
Chroma: 2 to 4
Texture: fine sandy loam, sandy loam or silt loam
Rock fragment content: 2 to 5 percent
Reaction: neutral or slightly alkaline

Bkg, Bg, BC, or BCg horizon:
Hue: 10YR
Value: 4 or 5
Chroma: 1 to 4
Texture: gravelly to extremely gravelly analogs of sandy loam or loamy sand
Rock fragment content: 15 to 85 percent
Reaction: slightly alkaline or moderately alkaline

C or Cg horizon:
Hue: 10YR
Value: 4 or 5
Chroma: 2 to 6
Texture: gravelly to extremely gravelly analogs of sandy loam, loamy sand, or loam; strata range in thickness from a few centimeters to several meters
Rock fragment content: 15 to 85 percent
Reaction: moderately alkaline or strongly alkaline

COMPETING SERIES: There are no other series in this family.

GEOGRAPHIC SETTING: The Coblen soils are on treads on low stream terraces. Slope ranges from 0 to 2 percent. The soils formed in loamy alluvium. Mean annual precipitation ranges from 838 to 1016 mm (33 to 40 inches). Mean annual air temperature ranges from 10 to 13 degrees C (50 to 55 degrees F).

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Rossburg, Sligo, Sloan, and Stringley soils. Rossburg soils are well drained and are on flood plains and low terraces. Stringley soils are well drained and Sligo soils are moderately well drained and are on adjacent flood plains. Sloan soils are very poorly drained and are in depressions on flood plains.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Moderately well drained. The depth to the top of an intermittent high water table ranges from 46 to 91 cm (1.5 to 3.0 feet) between January and May in normal years. The potential for surface runoff is negligible to low. Saturated hydraulic conductivity is moderately high. Permeability is moderate. Subject to rare flooding.

USE AND VEGETATION: Coblen soils are cultivated. Corn and soybeans are the principal crops. Some areas are pastured.

DISTRIBUTION AND EXTENT: Southwestern Ohio; MLRAs 111D and 114A. The type location is in MLRA 111D. The series is of small extent.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: AMHERST, MASSACHUSETTS

SERIES ESTABLISHED: Clinton County, Ohio 1999.

REMARKS: This soil was previously mapped as Medway. There are preliminary indications that Medway in other nearby correlated surveys will be in the coarse-loamy (not fine-loamy) family.

Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon: from surface to depth of 43 cm (Ap, A horizons).
Cambic horizon: from a depth of 43 to 124 cm (Bw, Bkg horizons).
Aquic conditions: redoximorphic features indicating wetness starting at 53 cm.
Fluventic properties: irregular decrease in organic carbon.

ADDITIONAL DATA: Characterization data for this soil is available through the Soil Characterization Laboratory, Ohio State University, pedon CT-84.

National Cooperative Soil Survey
U.S.A.