LOCATION MANDEVILLE MOEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Typic Hapludalfs
TYPICAL PEDON: Mandeville silt loam - on a 10 percent convex east-facing slope in a pasture. (Colors are for moist soil unless otherwise stated.)
A--0 to 5 inches; dark brown (10YR 4/3) silt loam, pale brown (10YR 6/3) dry; strong fine granular structure; very friable; slightly acid; clear smooth boundary. (2 to 6 inches thick)
E--5 to 8 inches; brown (10YR 5/3) silt loam; moderate fine granular structure; very friable; slightly acid; clear smooth boundary. (0 to 6 inches thick)
BE--8 to 11 inches; dark yellowish brown (10YR 4/4) silt loam; moderate coarse granular structure; friable; 10 percent fragments of weathered shale; medium acid; clear smooth boundary. (0 to 6 inches thick)
Bt1--11 to 19 inches; dark yellowish brown (10YR 4/4) silty clay loam; moderate very fine subangular blocky structure; firm; few faint clay films on faces of peds; 12 percent fragments of weathered shale; medium acid; gradual smooth boundary.
Bt2--19 to 26 inches; yellowish brown (10YR 5/4) channery silty clay loam; moderate fine subangular blocky structure; firm; few faint clay films on faces of peds; 15 percent fragments of weathered shale; strongly acid; gradual smooth boundary.
Bt3--26 to 35 inches; brown (10YR 5/3) channery silty clay loam; common fine distinct yellowish brown (10YR 5/6) mottles; weak fine subangular blocky structure; firm; few faint clay films on faces of peds; 25 percent fragments of weathered shale that has dark streaks and stains of iron and manganese oxides on surfaces; strongly acid; clear wavy boundary. (Combined thickness of the Bt horizon is 18 to 36 inches.)
Cr--35 to 60 inches; light olive brown (2.5Y 5/3) acid soft micaceous shale.
TYPE LOCATION: Howard County, Missouri; about 4 miles east of Armstrong, 2,100 feet east and 470 feet south of the northwest corner of sec. 32, T. 52 N., R. 15 W.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 20 to 40 inches. Depth to the soft shale ranges from 20 to 40 inches and depth to hard bedrock is greater than 60 inches. Reaction ranges from slightly acid to strongly acid in the A horizon and from medium acid to very strongly acid in the B horizon. In most pedons, at least some part of the B horizon is strongly acid.
The A horizon has hue of 10YR, value of 4 or 5, and chroma of 2 or 3. The E horizon has hue of 10YR, value of 5 or 6, and chroma of 3 or 4.
The Bt horizon has hue of 10YR or 7.5YR, value of 4 through 6, and chroma of 2 through 6. Mottles and colors with chroma of 2 or less are in the lower part of the B horizon in some pedons. Texture is silty clay loam, silt loam, loam, or their channery analogues. The content of sand, coarser than very fine, averages less than 10 percent. Volume of shale fragments, which are less than 3 inches in diameter, ranges from 10 to 25 percent. The combined fine sand or coarser sand and the shale fragments are 15 percent or more by weight in the control section.
The Cr horizon is weathered, soft, acid, micaceous shale. In some pedons the upper part is loam or silt loam with rock-like structure and shale fragments. In some pedons there are thin strata of limestone.
COMPETING SERIES: These are the Belmont, Belmore, Chenault, Chili, Coggon, Conestoga, Douds, El Dara, Gallman, Grellton, Hayden, Hebron, Hickory, High Gap, Hollinger, Kalamazoo, Kanawha, Kendallville, Kidder, Kosciusko, Leroy, Letort, Lindley, Martinsville, McHenry, Miami, Mifflin, Military, Nodine, Norden, Ockley, Owosso, Pecatonica, Princeton, Rawson, Relay, Renova, Richland, Riddles, Rockbridge, Roseville, Sisson, Strawn, Summitville, Teanaway, Theresa, Wawasee, Westville, Whalan, and Woodbine series in the same family. The Belmont, Kanawha, Martinsville, Miami, Nodine, Relay, Sisson, and Strawn soils do not have coarse fragments of micaceous shales and do not have a paralithic contact within 40 inches of the surface. Belmore, Chenault, Chili, Coggan, Conestoga, Douds, El Dara, Gallman, Grellton, Hayden, Hebron, Hickory, High Gap, Kalamazoo, Kendallville, Kidder, Kosciusko, Leroy, Letort, Lindley, McHenry, Mifflin, Military, Norden, Ockley, Owosso, Pecatonica, Princeton, Rawson, Renova, Richland, Riddles, Rockbridge, Roseville, Summitville, Teanaway, Theresa, Wawasee, and Woodbine soils have sand fractions with 10 percent or more coarser than very fine in the control section and lack a paralithic contact within 40 inches of the surface. Hollinger soils contain fragments of schist and flakes of mica in the control section. Military and Whalan soils have a lithic contact within 40 inches of the surface. Westville soils have at least one subhorizon of the Bt horizon that has 5YR hue.
GEOGRAPHIC SETTING: These soils are on rounded ridgetops and convex side slopes. Slope gradients typically range from 5 to 10 percent and the extreme range is from 2 to about 30 percent. The soils formed in residuum weathered from acid, micaceous shales. The mean annual temperature ranges from 52 to 57 degrees F, and the mean annual precipitation ranges from 33 to 40 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Norris and Sampsel soils. Norris soils are on side slopes downslope from Mandeville soils. They are shallow to acid shales and do not have argillic horizons. Sampsel soils are fine, wetter, and downslope from Mandeville soils.
DRAINAGE AND PERMEABILITY: Well drained and moderately well drained. Runoff is medium or rapid. Permeability is moderate.
USE AND VEGETATION: Primarily used for pasture and hay crops. Some areas are cropped to corn, soybeans, and small grains and some areas are in deciduous forest. Native vegetation is hardwood forest.
DISTRIBUTION AND EXTENT: These soils are widely distributed in Missouri. They are extensive, probably in excess of 150,000 acres.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Denver, Colorado
SERIES ESTABLISHED: Carroll County, Missouri, 1912.
REMARKS: Diagnostic horizons and features recognized in this series are: Ochric epipedon - the zone from the surface of the soil to a depth of 8 inches (A, E and BE horizons). Argillic horizon - the zone from approximately 11 inches to 35 inches (Bt1, Bt2 and Bt3 horizons). Paralithic contact - 35 inches. The type location is moved from Henry County to Howard County. Henry County is transitional between the mesic and thermic temperature regimes. Howard County is considered as being only in the mesic temperature regime.