LOCATION CORUNNA MI+MNEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, semiactive, mesic Typic Endoaquolls
TYPICAL PEDON: Corunna sandy loam - on a 1 percent slope in a cultivated field. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 11 inches; very dark gray (l0YR 3/1) sandy loam, grayish brown (10YR 5/2) dry; weak fine granular structure; very friable; many roots; neutral; abrupt smooth boundary. (10 to 12 inches thick)
Bg1--11 to 19 inches; grayish brown (10YR 5/2) sandy loam; common fine faint gray (10YR 5/1) and common fine distinct yellowish brown (10YR 5/6) mottles; weak fine granular structure; friable; few roots; slightly acid; gradual wavy boundary.
Bg2--19 to 30 inches; gray (10YR 5/1) sandy loam; common medium prominent yellowish brown (10YR 5/6) mottles; weak coarse granular structure; friable; neutral; gradual wavy boundary.
Bg3--30 to 36 inches; gray (10YR 6/1) sandy loam; common medium prominent yellowish brown (10YR 5/6) and few medium faint gray (10YR 5/1) mottles; weak coarse granular structure; friable; neutral; abrupt wavy boundary. (The combined thickness of the Bg horizon ranges from 8 to 30 inches.)
2Cg1--36 to 46 inches; gray (5Y 6/1) silty clay loam; common medium prominent yellowish brown (10YR 5/8) and light brown (7.5YR 6/4) mottles; massive; firm; mildly alkaline; gradual wavy boundary. (0 to 10 inches thick)
2Cg2--46 to 60 inches; gray (5Y 6/1) silty clay loam; common fine prominent yellowish brown (10YR 5/8) and common fine prominent light brown (7.5YR 6/4) mottles; massive; firm; pockets and lenses of fine sand; strong effervescence; mildly alkaline.
TYPE LOCATION: Macomb County, Michigan; 2,400 feet east and 37 feet north of the SW corner of sec. 11, T. 3 N., R. 13 E.
RANGE IN CHARACTERISTICS: The thickness of the solum ranges from 20 to 40 inches. Depth to the 2C horizon ranges from 26 to 40 inches. The solum ranges from medium acid to mildly alkaline. Rock fragments, dominantly gravel, ranges from 0 to 10 percent in the solum.
The A or Ap horizon has hue of 10YR, value of 2 or 3, and chroma of 1 or 2. It is sandy loam, fine sandy loam, or loam.
The B horizon has hue of 10YR to 5Y, value of 5 or 6, and chroma of 1 to 4. It is sandy loam, fine sandy loam, loam, or loamy fine sand.
Some pedons have a thin C horizon of gravelly sandy loam, sandy loam, loam, or loamy fine sand immediately above the 2C horizon.
The 2C horizon has hue of 10YR to 5Y hue, value of 4 to 6, and chroma of 1 to 6. It is loam, clay loam, or silty clay loam. It is mildly alkaline or moderately alkaline.
COMPETING SERIES: These are the Darfur, Dassel, Gilford, Hanska, Jubilee, Lyles, Toolesboro, and Zadog series. Similar soils are the Belleville and Wauseon series. Darfur soils do not have continuous, fine-loamy 2C horizons. Dassel, Gannett, Hanska and Jubilee soils do not have the loam, clay loam or silty clay loam 2C horizon above 40 inches. Gilford soils are underlain by sand and gravel at depths between 20 and 40 inches. Lyles soils have a thicker solum and do not have the loam, clay loam, or silty clay loam 2C horizon. Belleville soils are sandy over loamy. Toolesboro soils do not have loamy or silty calcareous 2C horizons above 40 inches. Wauseon soils have clay or silty clay 2C horizons. Zadog soils have iron accumulations in the subsoil and are underlain by sandy material.
GEOGRAPHIC SETTING: Corunna soils are on lake plains and till plains of Wisconsinan age. Slope gradients range from 0 to 2 percent. The mean annual precipitation ranges from 28 to 36 inches, and the mean annual temperature ranges from 44 to 48 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Barry, Brookston, Lenawee, Metamora, Metea, Miami, Owosso, and Toledo soils. The well drained Owosso soils and the somewhat poorly drained Metamora soils form a closely associated drainage sequence with Corunna soils. Corunna soils are associated with the poorly drained, stratified Lenawee and Toledo soils on lake plains. Brookston and Barry soils are wet associates in the moraines, and the well drained Miami and Metea soils commonly are on the ridgetops and slopes in some morainic areas.
DRAINAGE AND PERMEABILITY: Poorly drained. Runoff is very slow to ponded. Permeability is moderate or moderately rapid in the upper sandy loam layers and moderate or moderately slow in the 2C horizons.
USE AND VEGETATION: A large part is cropped to vegetables, corn, small grains, and grass-legume hay. Part of this soil is idle cropland, in permanent pasture, or in woodland. The native vegetation was mixed hardwoods with American elm, pin oak, swamp white oak, and red maple the principal species.
DISTRIBUTION AND EXTENT: Southern Michigan. The series is of moderate extent.
MLRA OFFICE RESPONSIBLE: Indianapolis, Indiana
SERIES ESTABLISHED: St. Clair County, Michigan, 1969.
REMARKS: Classification was adjusted to agree with ST Issue #17 on 6 Sept 94 by CLG. Diagnostic horizons and features recognized in this pedon are: mollic epipedon - the zone from the surface to 11 inches (Ap horizon); cambic horizon - the zone from 11 to 36 inches (Bg1, Bg2 and Bg3 horizons); aquic soil moisture regime.