LOCATION BUNCETON MOEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, active, mesic Mollic Hapludalfs
TYPICAL PEDON: Bunceton silt loam - on a north facing linear ridgetop of 4 percent slope in grass. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 8 inches; very dark grayish brown (10YR 3/2) silt loam, brown (10YR 5/3) dry; moderate fine granular structure; friable; many very fine roots; neutral; clear smooth boundary. (6 to 10 inches thick)
BE--8 to 11 inches; yellowish brown (10YR 5/4) silt loam; weak very fine subangular blocky structure; friable; many very fine roots; few fine iron and manganese oxide accumulations; few distinct silt coats and common distinct organic coatings on faces of peds; neutral; clear smooth boundary. (0 to 8 inches thick)
Bt1--11 to 21 inches; dark yellowish brown (10YR 4/4) silty clay loam; moderate very fine subangular blocky structure; firm; many very fine roots; many prominent clay films on faces of peds; few fine iron and manganese oxide accumulations; few distinct silt coats on faces of peds; neutral; gradual smooth boundary.
Bt2--21 to 31 inches; dark yellowish brown (10YR 4/4) silty clay loam; moderate fine subangular blocky structure; firm; common very fine roots; common prominent clay films on faces of peds; few fine iron and manganese oxide accumulations; few distinct silt coats on faces of peds; slightly acid; gradual smooth boundary. (Combined thickness of the Bt horizon is 14 to 28 inches.)
2Btx1--31 to 39 inches; dark yellowish brown (10YR 4/4) silty clay loam; weak medium prismatic structure; firm; common very fine roots; few distinct clay films on faces of peds; few medium iron and manganese oxide accumulations; 2 percent chert gravel; 55 percent weak brittleness; slightly acid; gradual smooth boundary.
2Btx2--39 to 48 inches; strong brown (7.5YR 4/6) silty clay loam; weak coarse subangular blocky structure; firm; few very fine roots; common distinct clay films on faces of peds; few fine iron and manganese oxide accumulations; 5 percent chert gravel; 50 percent weak brittleness; common distinct silt coats on faces of peds; moderately acid; clear smooth boundary. (Combined thickness of the 2Btx horizon is 15 to 40 inches.)
3Bt--48 to 60 inches; brown (7.5YR 5/4) and strong brown (7.5YR 5/6) extremely gravelly silt loam; moderate very fine subangular blocky structure; firm; many very fine roots; common prominent clay films on faces of peds; few fine iron and manganese oxide accumulations; 60 percent chert gravel; 5 percent chert cobbles; 5 percent chert stones; moderately acid.
TYPE LOCATION: Cooper County, Missouri; about 1 mile north of Bunceton; 450 feet east and 1400 feet south of the northwest corner of sec. 33, T. 47 N., R. 17 W.
RANGE IN CHARACTERISTICS: Depth to the top of the brittle horizon is 20 to 40 inches.
The A horizon has color value of 2 or 3, 4 or 5 dry and chroma of 2 or 3. It is silt loam or silty clay loam and moderately acid to neutral. The BE horizon has color value of 4 to 5 and chroma of 2 to 4. It is silt loam or silty clay loam and moderately acid to neutral. Some pedons have an E horizon.
The Bt horizon has hue of 10YR or 7.5YR, value of 4 or 5, and chroma of 3 to 6. It is silty clay loam or silt loam and strongly acid to neutral.
The 2Btx horizon has hue of 7.5YR or 10YR, value of 4 to 6, and chroma of 2 to 6. It is silt loam, silty clay loam or their gravelly to extremely gravelly analogues. Brittleness ranges from 20 to 60 percent. It is strongly acid to neutral. Some pedons have a 2Ex horizon.
The 3Bt horizon has hue of 10YR to 5YR, value of 4 or 5, and chroma of 2 to 6. It is gravelly, very gravelly, or extremely gravelly analogues of silt loam or silty clay loam. Reaction is slightly acid or neutral. Some pedons have a 3Btx horizon.
Some pedons have a 4Bt horizon with color and reaction similar to the 3Bt horizon. It is silty clay or clay or their gravelly analogues.
COMPETING SERIES: These are the Ashton, Batavia, Bowes, Churchtown, Deroin, Downs, Festina, Frankville, Grays, Harvard, Hedrick, Juda, Knox, Luana, Massbach, Mellott, Mt. Carroll, Myrtle, Nasset, Newhouse, Newvienna, Richview, Shelbyville, Throckmorton, Watkins, Waubeek and Wingate series of the same family. All of these series do not have a horizon with fragic or brittle characteristics.
GEOGRAPHIC SETTING: Bunceton soils are on hills and formed in loess and residuum from cherty limestone. Slopes range from 2 to 14 percent. Mean annual temperature ranges from 55 to 57 degrees F, and mean annual precipitation ranges from 36 to 42 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Eldon, Maplewood and Wrengart series. The Eldon soils have more clay and cherty gravel in the upper 20 inches of the argillic horizon. Maplewood soils have more clay in the upper 20 inches of the argillic horizon. Wrengart soils have a lighter colored surface layer. Eldon soils are on lower slopes. Maplewood and Weingarten soils are on similar positions.
DRAINAGE AND PERMEABILITY: Well drained. Runoff is medium. Permeability is moderately slow.
USE AND VEGETATION: Most areas are cultivated or in pasture or hayland. Native vegetation is mixed grasses and hardwood deciduous trees.
DISTRIBUTION AND EXTENT: Bunceton soils are mapped in the Ozark border area of central Missouri. The acreage is of minor extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Morgantown, West Virginia
SERIES ESTABLISHED: Cooper County, Missouri, 1994.
REMARKS: Diagnostic horizons and features recognized in this series are: ochric epipedon - the zone from the surface of the soil to a depth of 11 inches (Ap and BE horizons); argillic horizon - the zone from approximately 11 to 60 inches (Bt1, Bt2, 2Btx1, 2Btx2 and 3Bt horizons).