LOCATION COOLVILLE OH+IN WVEstablished Series
TAXONOMIC CLASS: Fine, mixed, active, mesic Aquultic Hapludalfs
TYPICAL PEDON: Coolville silt loam - on a 3 percent southwest-facing convex slope in woodland. (Colors are for moist soil unless otherwise stated.)
Oe--0 to 1 inches; partially decomposed pine needles, duff. (0 to 2 inches thick)
Ap--1 to 8 inches; brown (10YR 4/3) silt loam, brown (10YR 5/3) dry; weak medium granular structure; friable; many coarse roots; very strongly acid; abrupt smooth boundary. (6 to 10 inches thick)
BE--8 to 11 inches; yellowish brown (10YR 5/6) silt loam; weak fine subangular blocky structure; few faint brown (10YR 5/3) silt coatings on faces of peds; friable; many fine roots; very strongly acid; clear smooth boundary. (0 to 6 inches thick)
Bt1--11 to 15 inches; yellowish brown (10YR 5/6) silty clay loam; moderate medium subangular blocky structure; friable; many fine roots; common distinct dark yellowish brown (10YR 4/4) clay films on faces of peds; common distinct pale brown (10YR 6/3) silt coatings on faces of peds; very strongly acid; clear smooth boundary.
Bt2--15 to 20 inches; yellowish brown (10YR 5/4) silty clay loam; moderate medium subangular blocky structure parting to moderate fine subangular blocky; friable; many fine roots; common faint dark yellowish brown (10YR 4/4) clay films on faces of peds; common fine faint yellowish brown (10YR 5/6) masses of iron accumulation in the matrix; few medium distinct grayish brown (10YR 5/2) iron depletions in the matrix; 1 percent rock fragments; very strongly acid; clear smooth boundary. (Combined thickness of the Bt horizons is 7 to 22 inches.)
2Bt3--20 to 25 inches; light yellowish brown (10YR 6/4) silty clay; moderate coarse subangular blocky structure parting to moderate medium subangular blocky; firm; many fine roots; many distinct gray (10YR 6/1) clay films on faces of peds; common faint pale brown (10YR 6/3) silt coatings on faces of peds; common medium prominent red (2.5YR 4/6) masses of iron accumulation; 1 percent rock fragments; extremely acid; clear wavy boundary.
2Bt4--25 to 34 inches; red (2.5YR 4/6) silty clay; weak coarse prismatic structure parting to moderate medium subangular blocky; firm; few fine roots; many prominent gray (N 5/) clay films on vertical faces of peds; common medium prominent grayish brown (10YR 5/2) iron depletions in the matrix; extremely acid; clear smooth boundary.
2Bt5--34 to 41 inches; strong brown (7.5YR 5/6) silty clay; weak coarse subangular blocky structure; firm; few fine roots; many prominent gray (10YR 6/1) clay films on faces of peds; few fine prominent red (2.5YR 4/6) masses of iron accumulation in the matrix; very strongly acid; clear
smooth boundary. (Combined thickness of the 2Bt horizons is 10 to 24 inches.)
2BC--41 to 49 inches; yellowish brown (10YR 5/4) silty clay loam; weak coarse subangular blocky structure; firm; few coarse prominent strong brown (7.5YR 5/6) masses of iron accumulation and few coarse distinct gray (10YR 6/1) iron depletions in the matrix; 5 percent rock fragments; very strongly acid; clear smooth boundary. (0 to 13 inches thick)
2Cr--49 to 60 inches; yellowish brown (10YR 5/4) thin bedded, soft shale bedrock; can be cut with difficulty with a spade.
TYPE LOCATION: Pike County, Ohio, Benton Township; about 2 1/2 miles west of Morgantown; 3,300 feet northwest of intersection of County Road 2 and Township Road 230, and 410 feet east.
RANGE IN CHARACTERISTICS: Depth to the base of the argillic horizon and to the paralithic contact is 40 to 60 inches. The silty mantle commonly is from 14 to 22 inches, but ranges to 26 inches in thickness. Thin flat pararock fragments of shale and siltstone range up to 5 percent by volume in the Ap and Bt horizons, up to 15 percent in the 2Bt horizons, and up to 30 percent in the 2BC and in 2C horizons, where present.
The Ap horizon has hue of 10YR, value of 4 or 5 moist (5 to 7 dry), and chroma of 2 or 3. Some pedons have an A horizon, 1 to 4 inches thick, and an E horizon. The A has hue of 10YR, value of 2 to 4 (4 to 6 dry), and chroma of 1 or 2. The Ap, A, and E horizons typically are silt loam, but the Ap horizon is silty clay loam in some eroded pedons. Reaction is
neutral to extremely acid, depending on liming history.
The Bt horizon has hue of 7.5YR, 10YR, or 2.5Y; value of 4 or 5; and chroma of 4 to 6. The clay content averages 30 to 40 percent, and the sand content averages 1 to 5 percent. Reaction is strongly acid to extremely acid.
The 2Bt horizon has hue of 2.5YR, 5YR, 7.5YR, or 10YR; value of 4 to 6; and chroma of 4 to 8 (2 or 3 also in the lower part). Thin subhorizons in the lower part have hue of 2.5Y. Redox accumulations are of high chroma or variegations of 2.5YR or 5YR hue are present where matrix hue is 7.5YR or
10YR. The 2Bt horizon is silty clay, clay, or silty clay loam. The clay content averages from 35 to 60 percent, and the sand content averages from 1 to 12 percent. Reaction is strongly acid to extremely acid.
The 2BC horizon has hue of 2.5YR, 5YR, 7.5YR, 10YR, or 2.5Y; value of 4 to 6; chroma of 2 to 8, with redox features. It is silty clay or silty clay loam, or their channery analogues. The clay content averages from 35 to 60 percent, and the sand content averages from 1 to 10 percent. Reaction is strongly acid or very strongly acid.
Some pedons have a 2C horizon that has similar color, texture and reaction range as the 2BC horizon.
Bedrock is mainly soft acid clay shale, and includes thin interbeds of siltstone or fine grained sandstone.
COMPETING SERIES: These are the Rarden series. Rarden soils have a paralithic contact at a depth of 20 to 40 inches.
GEOGRAPHIC SETTING: In Ohio and West Virginia the Coolville soils are on summits or benches of the unglaciated Allegheny Plateau that have a plane or convex surface. In Indiana they are on summits and shoulders of hills. Slope range is from 0 to 25 percent. The soils formed in a thin loess mantle and in the underlying clayey residuum weathered mainly from acid
shale. Mean annual precipitation ranges from about 35 to 45 inches, and mean annual temperature ranges from about 52 to 57 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing
Rarden soils and the
Brownsville,
Gilpin,
Kurtz,
Latham,
Rigley,
Shelocta,
Stonehead,
Tilsit,
Upshur,
Wellston,
and
Zanesville soils. The moderately deep Gilpin, Rarden, and Latham soils are on summits and side slopes that do not have a loess mantle or the mantle is less than 14 inches thick. In addition, Gilpin soils are well drained and fine-loamy, and
Latham soils have lower base saturation. The deep, well drained Upshur soils are on summits and sideslopes, and are commonly intermingled with the Gilpin soils. Brownsville soils are mainly on steep or very steep side slopes, whereas Rigley and Shelocta soils are more common on footslopes or benches and some summits. The well drained Kurtz soils are on backslopes. The moderately well drained Stonehead soils are on summits and shoulders. Brownsville, Rigley, and
Shelocta soils contain less clay. In addition, Brownsville soils contain more rock fragments in the solum. Tilsit, Wellston and Zanesville soils are in similar landscape positions. Wellston soils contain less clay and Tilsit and Zanesville soils have a fragipan.
DRAINAGE AND PERMEABILITY: Moderately well drained. Depth to an intermittent perched water table is 1 to 2 feet in most years. Permeability is moderate in the upper part of the solum and slow or very slow in the lower part. Runoff is high on gentle slopes and very high on steeper slopes.
USE AND VEGETATION: About 50 percent of these soils are in cropland, 20 percent in forest, and the remainder is in pasture or other uses. The native vegetation is deciduous hardwood forest with oak, hickory, and maple the dominant species.
DISTRIBUTION AND EXTENT: South-central Ohio, West Virginia, and southeastern Indiana. The series is of moderate extent and mainly in MLRA's 124, 126, 128 and 120.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Morgantown, West Virginia
SERIES ESTABLISHED: Athens County, Ohio, 1932.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
ochric epipedon - from the surface to a depth of about 10 inches (Ap and BE horizons); argillic horizon - the zone from a depth of about 11 to 41 inches (Bt1-2Bt5 horizons) - aquic conditions 15 to 41 inches (Bt2-2BC horizons); paralithic contact - at 49 inches; redox features at 15 to 49 inches.
ADDITIONAL DATA: Laboratory characterization data is available for MG-S9, PK-3 (the typical pedon), and RO-53. Lab data is available for a few pedons in Indiana.