LOCATION SACVILLE MOEstablished Series
TAXONOMIC CLASS: Fine, smectitic, mesic Vertic Argiaquolls
TYPICAL PEDON: Sacville silty clay loam on a 2 percent concave east-facing footslope in a pasture at an elevation of 1,023 feet. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 7 inches; very dark gray (10YR 3/1) silty clay loam, gray (10YR 5/1) dry; moderate very fine subangular blocky structure; friable; many fine roots; few faint clay films on faces of peds; few fine distinct dark yellowish brown (10YR 3/4) masses of iron accumulation; slightly acid; abrupt smooth boundary. (5 to 15 inches thick)
Btg1--7 to 17 inches; very dark gray (10YR 3/1) silty clay, grayish brown (10YR 5/2) dry; strong very fine subangular blocky structure; firm; many fine roots; few distinct clay films on faces of peds; 2 percent subrounded chert gravel; common fine distinct dark yellowish brown (10YR 3/4) masses of iron accumulation; slightly acid; clear smooth boundary.
Btg2--17 to 24 inches; dark grayish brown (10YR 4/2) clay; strong fine subangular blocky structure; very firm; common very fine roots; common distinct very dark gray (10YR 3/1) clay films on faces of peds; common fine iron-manganese concretions; 10 percent subrounded chert gravel; common fine distinct dark yellowish brown (10YR 3/4) masses of iron accumulation; slightly acid; clear smooth boundary. (Combined thickness of the Btg horizon is 11 to 60 inches)
2Btg3--24 to 33 inches; dark grayish brown (2.5Y 4/2) clay; strong coarse subangular blocky structure; very firm; few very fine roots; many distinct dark gray (10YR 4/1) clay films on faces of peds; 2 percent subrounded chert gravel; common fine distinct yellowish brown (10YR 5/6) masses of iron accumulation; neutral; gradual smooth boundary.
2Btg4--33 to 46 inches; grayish brown (2.5Y 5/2) clay; moderate medium subangular blocky structure; very firm; few very fine roots; very few distinct clay films on faces of peds and very few prominent pressure faces on faces of peds; 5 percent subrounded chert gravel; many coarse distinct yellowish brown (10YR 5/6), few fine distinct yellowish brown (10YR 5/8) and few fine distinct strong brown (7.5YR 5/6) masses of iron accumulation; slightly alkaline; abrupt smooth boundary. (Combined thickness of the 2Btg horizon is 0 to 42 inches)
3Btg5--46 to 65 inches; light brownish gray (2.5Y 6/2) very gravelly clay; weak fine subangular blocky structure; firm; few fine roots; few distinct clay films on faces of peds; 50 percent chert gravel; common medium prominent yellowish brown (10YR 5/8) masses of iron accumulation; slightly alkaline; gradual smooth boundary.
3Btg6--65 to 80 inches; light brownish gray (2.5Y 6/2) very cobbly clay; weak fine subangular blocky structure; firm; few fine roots; few distinct clay films on faces of peds and very few distinct organic coats in root channels and/or pores; 25 percent sandstone and siltstone cobbles and 25 percent chert gravel; common medium prominent yellowish brown (10YR 5/8) masses of iron accumulation; slightly alkaline.
TYPE LOCATION: Polk County, Missouri; about 1/4 mile north if the town of Polk, 975 feet north and 1500 feet east of the southwest corner of sec. 31, T. 35 N., R. 21 W.; Polk USGS topographic quadrangle; latitude 42 degrees 44 minutes 35 seconds N., longitude 93 degrees 17 minutes 52 seconds W.
RANGE IN CHARACTERISTICS: The thickness of the solum is 40 to more than 80 inches. The mollic epipedon is 10 to 24 inches thick, and typically extends into the upper part of the Btg horizon. Cracks of about one-half inch or more in width are in the A, Btg, and upper 2Btg horizons. The linear extensibility is 6.0 cm or higher.
The A or Ap horizon have hue of 10YR or 2.5Y, value of 2 or 3 and chroma of 1 or 2. The A horizon is typically silty clay loam, but some pedons are silt loam. Also, some pedons have a thin E horizon. Reaction is strongly acid to neutral.
The upper Btg has hue of 10YR or 2.5Y, value of 2 to 5, and chroma of 1 or 2. It is silty clay loam, silty clay, or clay. Reaction is very strongly acid to neutral.
The lower Btg horizon, below the mollic epipedon, and the 2Btg horizon have hue of 10YR to 5Y, value of 4 to 6 and chroma of 1 or 2, with higher chroma iron masses and accumulations. Texture is silty clay loam, silty clay or clay or their gravelly and cobbly analogues. Gravel and cobble content ranges from 1 to 60 percent. Reaction is very strongly acid to moderately alkaline.
The 3Btg and BC horizons, where present, are mottled with hue of 2.5Y or 5Y, value of 4 to 6 and chroma of 1 to 4. Texture is similar to the lower Btg horizon. Reaction is moderately acid to moderately alkaline.
COMPETING SERIES: These are the Butler, Carbika, Chancellor, Clarinda, Coatsburg, Edinburg, Fosterburg, Haig, Lodgepole, Mazaska, Minnetonka, Sampsel, Taintor, Terrabella, Virden, and Worthing series. Butler and Carbika soils have free carbonates at 18 to 80 inches. Chancellor soils have a mean annual temperature below 52 degrees F. and have free carbonates within 60 inches. Clarinda, Coatsburg, Haig, Lodgepole, Mazaska, Minnetonka, Taintor, Terrabella, and Worthing soils have a mean annual temperature of less than 54 degrees F. Edinburg soils do not have rock fragments in the series control section and are on till plains. Fosterburg soils have a concentration of exchangeable sodium. Sampsel soils have a Cr (paralithic) horizon within 80 inches. Virden soils have free carbonates in the lower part of the series control section, average less than 5 percent sand and have less than 1 percent rock fragments in the particle size control section.
GEOGRAPHIC SETTING: Sacville soils are on very gently and gently sloping upland footslopes and on headslopes of drainageways. These soils formed in colluvium derived from a mixture of loess and material weathered from sedimentary rocks. Slopes range from 1 to 9 percent. The mean annual temperature ranges from 54 to 58 degrees F., and the mean annual precipitation ranges form 28 to 52 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Eldon, Freeburg, Goodson, and Hartville soils. Eldon soils are clayey-skeletal. Goodson soils do not have a mollic epipedon. Both are on steeper hillslopes above the Sacville soils. Freeburg soils are fine-silty and are on stream terraces. Hartville soils have an ochric epipedon and are on stream terraces below the Sacville soils.
DRAINAGE AND PERMEABILITY: Poorly drained. Runoff is low to medium. Permeability is slow. In undisturbed areas, a perched water table has an upper limit of 0 to 1.0 foot during November to May in most years.
USE AND VEGETATION: Most areas are used for hay and pasture. Some areas are cultivated to produce corn, wheat, and soybeans. Native vegetation was tall prairie grasses.
DISTRIBUTION AND EXTENT: The Ozark region (MLRAs 116B and 116A) of southern Missouri. The series is of moderate extent. About 50,000 acres have been mapped to date.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Morgantown, West Virginia
SERIES ESTABLISHED: Morgan County, Missouri, 1996.
REMARKS: These soils have been included in the Sampsel series in previous surveys. They are mapped mainly in the Northview and Jefferson City geologic formations in Missouri.
Diagnostic horizons and surface features recognized in this series are:
Mollic epipedon - the zone from the surface of the soil to a depth of 17 inches (Ap and Btg1 horizons).
Argillic horizon - the zone from approximately 7 to 80 inches (Btg horizons).
Aquic feature - chroma of one and distinct redox concentrations in the lower part of the mollic epipedon.
Vertic feature - a linear extensibility of 6.0 cm or more.
ADDITIONAL DATA: University of Missouri Soil Characterization Laboratory Data Number -- M9016759