LOCATION DRURY ILEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, mesic Dystric Eutrudepts
TYPICAL PEDON: Drury silt loam - on a nearly level slope, rarely flooded, in a cultivated field at an elevation of about 465 feet (142 meters) above mean sea level. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 7 inches (0 to 18 cm); brown (10YR 4/3) silt loam, pale brown (10YR 6/3) dry; moderate medium granular structure; friable; common very fine and few fine roots; neutral; abrupt smooth boundary. [6 to 12 inches (15 to 30 cm) thick]
Bw1--7 to 12 inches (18 to 30 cm); dark yellowish brown (10YR 4/4) silt loam; moderate fine subangular blocky structure; friable; few very fine and fine roots; many distinct dark brown (10YR 3/3) organo-clay films on faces of peds and lining pores; neutral; clear smooth boundary.
Bw2--12 to 19 inches (30 to 48 cm); dark yellowish brown (10YR 4/4) silt loam; weak fine prismatic structure parting to moderate fine subangular blocky; friable; few very fine and fine roots; common distinct dark brown (10YR 3/3) organo-clay films on faces of peds and lining pores; neutral; gradual smooth boundary.
Bw3--19 to 26 inches (48 to 66 cm); dark yellowish brown (10YR 4/4) silt loam; weak medium prismatic structure parting to moderate fine and medium subangular blocky; friable; few very fine and fine roots; common distinct dark brown (10YR 3/3) organo-clay films on faces of peds and lining pores; neutral; gradual smooth boundary.
Bw4--26 to 36 inches (66 to 91 cm); dark yellowish brown (10YR 4/4) silt loam; weak medium prismatic structure parting to moderate medium subangular blocky; friable; few very fine and fine roots; few distinct dark brown (10YR 3/3) organo-clay films on faces of peds and lining pores; neutral; gradual smooth boundary.
Bw5--36 to 43 inches (91 to 117 cm); dark yellowish brown (10YR 4/4) silt loam; weak medium prismatic structure parting to weak medium subangular blocky; very friable; few very fine roots; few distinct dark brown (10YR 3/3) organo-clay films on faces of peds and lining pores; neutral; gradual smooth boundary. [Combined thickness of the Bw horizons is 10 to 36 inches (25 to 91 cm).]
C1--43 to 70 inches (117 to 178 cm); dark yellowish brown (10YR 4/4) silt loam; massive; very friable; few fine distinct yellowish brown (10YR 5/6) masses of iron accumulation in the matrix; few fine rounded prominent black (N 2.5/) masses of manganese accumulation; neutral; gradual smooth boundary.
C2--70 to 80 inches (178 to 203 cm); dark yellowish brown (10YR 4/4) silt loam; massive; friable; few fine rounded prominent black (N 2.5/) masses of manganese accumulation; neutral.
TYPE LOCATION: Monroe County, Illinois; about 1.5 miles northwest of Chalfin Bridge; approximately 2,310 feet north and 1980 feet west of the southeast of sec. 35, T. 3 S., R. 11 W.; USGS Selma, IL.-MO. topographic quadrangle; lat. 38 degrees 13 minutes 52 seconds N. and long. 90 degrees 16 minutes 54 seconds W., NAD 27.
RANGE IN CHARACTERISTICS: The solum commonly is 30 to 40 inches (76 to 102 cm) in thickness but ranges from 26 to 55 inches (66 to 140 cm). It is moderately acid to neutral except pedons that have been limed range to moderately alkaline in the Ap horizon. The control section averages between 18 to 25 percent clay.
The Ap or A horizon has hue of 10YR, value of 3 or 4 (4 to 6 dry), and chroma of 2 through 4. Pedons that have color value of 3 (5 dry) have an A or Ap horizon less than 9 inches (23 cm) in thickness. The Ap or A horizon is silt loam or silt.
The E horizon, where present, has hue of 10YR, value of 4 or 5, and chroma of 3 or 4. It is silt loam or silt.
The Bw horizon has hue of 10YR or 7.5YR, value of 4 or 5, and chroma of 3 to 6 in the upper part and 2 to 6 in the lower part. It is silt loam.
The C horizon has hue of 10YR, value of 3 to 6, and chroma of 2 to 4. Some pedons show evidence of stratification, most commonly below a depth of 45 inches (114 cm). Strata are loam, silt loam, and very fine sandy loam. The C horizon typically is slightly acid or neutral, but ranges to slightly alkaline. Some pedons contain free carbonates below a depth of 40 inches (102 cm). Some pedons contain buried horizons that commonly are below a depth of 50 inches (127 cm).
COMPETING SERIES: These are the Contrary, Exette and Killduff series in the same family and the Moshannon, Raddle, Seaton, and Timula series in related families. Contrary soils contain low chroma relict mottles throughout the Bw horizon. Exette soils contain relict mottles in the upper part of the solum and typically have yellowish hue and lower chroma in the solum. Killduff soils contain more clay in the control section. Moshannon soils have an irregular decrease in organic matter content with increasing depth. Raddle soils have a mollic epipedon. Seaton soils have an argillic horizon. Timula soils contain free carbonates within a depth of 40 inches (102 cm).
GEOGRAPHIC SETTING: Drury soils are on the foot slopes of steep river bluffs adjacent to flood plains of major streams, and less commonly on stream terraces where currently there is little or no deposition of alluvium. Slopes commonly are 2 to 10 percent but range between 0 and 30 percent. Drury soils formed in silty local alluvial sediments, and less commonly in silty outwash. Mean annual temperature ranges from 47 to 57 degrees F (8 to 14 degrees C), and mean annual precipitation ranges from 34 to 48 inches (864 to 1219 mm). Frost free days range from 170 to 200 days. Elevation ranges from 340 to 700 feet (104 to 213 meters) above mean sea level.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Raddle and Seaton soils and the Alford, Fayette, Haymond, Wakeland and Worthen soils. Raddle soils are on similar parts of the landscape nearby and Seaton soils are on uplands upslope from Drury soils. The Alford and Fayette soils have an argillic horizon and are on the side slopes and summits of the bluffs above Drury soils. Haymond and Wakeland soils contain less clay and are on flood plains below Drury soils. Worthen soils are on nearby similar landscapes and have a mollic epipedon.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Drury soils are well drained. Surface runoff is medium on lesser slopes and rapid on steep slopes. Saturated hydraulic conductivity is moderately high or high (4.23 to 14.11 micrometers per second). Permeability is moderate (0.6 to 2 inches per hour).
USE AND VEGETATION: Most areas are cultivated. Corn, soybeans, and small grain are the principal crops. Some areas are in pasture or woodland. Native vegetation was hardwood forest.
DISTRIBUTION AND EXTENT: Illinois. These soils are small in extent in MLRAs 108B, 114B, 115A, 115B and 115C. The type location is in MLRA 115B.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Indianapolis, Indiana
SERIES ESTABLISHED: Clinton County, Illinois, 1931.
REMARKS: These soils were previously called well drained and moderately well drained. These soils do not have a water table above a depth of 6 feet (183 cm) for 30 consecutive days.
Diagnostic horizons and features recognized in this pedon are: ochric epipedon - the zone from the surface of the soil to a depth of 7 inches (18 cm), (Ap horizon); cambic horizon - the zone from about 12 to 43 inches (30 to 109 cm), (Bw1, Bw2, Bw3, Bw4 and Bw5 horizons).