LOCATION SHANNONDALE MOEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, mesic Aquic Argiudolls
TYPICAL PEDON: Shannondale silt loam - on a 1 percent slope in a cultivated field at an elevation of 680 feet. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 9 inches; very dark grayish brown (10YR 3/2) silt loam, dark grayish brown (10YR 5/2) dry; weak medium platy structure parting to moderate fine granular; very friable; common very fine roots; neutral; abrupt smooth boundary.
A--9 to 17 inches; dark brown (10YR 3/3) silt loam, brown (10YR 5/3) dry; moderate fine subangular blocky structure; friable; few very fine roots; common silt coats; neutral; clear smooth boundary. (Combined thickness of the A horizon is 10 to 24 inches)
Bt1--17 to 35 inches; dark yellowish brown (10YR 4/4) silty clay loam,; moderate fine prismatic structure parting to moderate fine subangular blocky; firm; few very fine roots; many faint clay films on faces of peds; few fine prominent light gray (10YR 7/2) iron depletions throughout; common organic stains on faces of peds; slightly acid; clear smooth boundary.
Bt2--35 to 58 inches; yellowish brown (10YR 5/4) silty clay loam; moderate fine prismatic structure parting to moderate fine subangular blocky; firm; few very fine roots; many distinct clay films on faces of peds; common fine prominent light gray (10YR 7/2) iron depletions throughout; few organic stains on faces of peds; strongly acid; clear smooth boundary. (Combined thickness of the Bt horizon is 30 to 48 inches)
2C--58 to 75 inches; dark brown (7.5Y 4/4) loam; massive parting to weak fine bedding planes; very friable: few clay flows in voids and root channels; common fine prominent light gray (10YR 7/2) iron depletions throughout; few very dark grayish brown organic stains; strongly acid.
TYPE LOCATION: Chariton County, Missouri; 2 miles east of Keytesville; 2,550 feet west and 50 feet north of the southeast corner of sec. 35, T. 54 N., R. 18 W; Keytesville USGS quadrangle, latitude 39 degrees 26 minutes 23 seconds N and longitude 92 degrees 54 minutes 01 seconds W..
RANGE IN CHARACTERISTICS: Thickness of the mollic epipedon ranges from 10 to 24 inches. Depth to the base of the argillic horizon is 40 to 60 inches or more. The particle size control section averages 25 to 35 percent clay. The A and B horizons contain less than 10 percent sand. Depth to a layer with more than 10 percent sand is less than 60 inches.
The A or Ap horizon has color value of 2 or 3 moist, 4 or 5 dry and chroma of 1 to 3. It is silt loam or silty clay loam and ranges from strongly acid to neutral.
The upper part of the Bt horizon has hue of 7.5YR or 10YR, value of 2 to 4 and chroma of 2 to 4. The lower part has hue of 7.5YR to 2.5Y, value of 3 to 5 and chroma of 2 to 6. Iron accumulations or depletions have hue of 7.5YR to 2.5Y, value of 4 to 7 and chroma of 1 to 8. Reaction is very strongly acid to neutral.
The 2C horizon has hue of 7.5YR to 2.5Y, value of 3 to 5, chroma of 2 to 7 and is mottled. It is silt loam, loam, very fine sandy loam, or fine sandy loam and contains over 15 percent sand. Reaction is very strongly acid to neutral.
COMPETING SERIES: These are the Brenton, Elburn, Frankenmuth, Harco, Higginsville, Keller, Lafayette, Lawndale, Lisbon, Loran, Mundelein, Nevin, Raub, Rooks and Rowley series. Brenton, Keller, Lafayette, Mundelein and Raub soils have a lithologic discontinuity at depths of 20 to 40 inches. Elburn and Loran soils have average annual temperature in the soil temperature control section of 48 to 53 degrees F. Frankenmuth, Harco, Lisbon and Rooks soils have calcium carbonates at depths of 20 to 40 inches. Higginsville soils contain less than 10 percent sand throughout. Lawndale soils have sand or loamy sand textures at depths of 40 to 60 inches. Nevin soils commonly have less than 15 percent sand throughout and mean annual temperature of less than 54 degrees F. Rowley soils are stratified in the lower part of the solum.
GEOGRAPHIC SETTING: Shannondale soils are on nearly level to moderately sloping low stream terraces, terrace risers or floodplains. Slopes commonly are 0 to 3 percent, but ranges to 9 percent. The soils formed in loess, loess and alluvium, or silty alluvium. The mean annual temperature ranges from 54 to 57 degrees F, and mean annual precipitation ranges from 32 to 38 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: Shannondale soils commonly are associated with the Gifford, Tina, and Triplett soils. Gifford, Tina, and Triplett soils contain more clay in the series control section and are on similar landscape positions.
DRAINAGE AND PERMEABILITY: Moderately well drained. Runoff is low or medium. Permeability is moderate. In undisturbed areas, an apparent water table has an upper limit of 1.5 to 2.5 feet during November to April in most years.
USE AND VEGETATION: Most areas are used to grow corn, soybeans, and small grains. Native vegetation is prairie grasses.
DISTRIBUTION AND EXTENT: North central Missouri. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Indianapolis, Indiana
SERIES ESTABLISHED: Chariton County, Missouri, 1992.
REMARKS: Diagnostic horizons and features recognized in this series are: mollic epipedon - the zone from the surface of the soil to a depth of 17 inches (Ap and A horizons); argillic horizon - the zone from approximately 17 to 58 inches (Bt1 and Bt2 horizons).
There soils are prime farmland where slopes are less than 6 percent.