LOCATION BROUILLETT IL+IN MNEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Aquic Cumulic Hapludolls
TYPICAL PEDON: Brouillett silt loam - on a nearly level slope in a pasture at an elevation of about 183 meters (600 feet) above mean sea level. (Colors are for moist soil unless otherwise stated.)
A1--0 to 28 cm (0 to 11 inches); very dark gray (10YR 3/1) silt loam, gray (10YR 5/1) dry; moderate fine and medium granular structure; friable; many very fine roots; slightly alkaline; gradual wavy boundary.
A2--28 to 48 cm (11 to 19 inches); very dark gray (10YR 3/1) silt loam, gray (10YR 5/1) dry; moderate very fine and fine subangular blocky structure; friable; common very fine roots; slightly alkaline; gradual wavy boundary.
A3--48 to 66 cm (19 to 26 inches); very dark gray (10YR 3/1) silt loam, gray (10YR 5/1) dry; moderate fine subangular blocky structure; friable; common very fine roots; slightly alkaline; clear wavy boundary.[Combined thickness of the A horizon ranges from 61 to 91 cm (24 to 36 inches).]
Bg1--66 to 86 cm (26 to 34 inches); dark grayish brown (10YR 4/2) silt loam; weak medium subangular blocky structure; friable; common very fine roots; many distinct very dark gray (10YR 3/1) organic coatings on faces of peds; common fine and medium rounded black (10YR 2/1) weakly cemented nodules of iron- manganese oxide throughout; slightly alkaline; gradual wavy boundary.
Bg2--86 to 107 cm (34 to 42 inches); light brownish gray (2.5Y 6/2) silt loam; weak medium and coarse subangular blocky structure; friable; few very fine roots; few distinct very dark gray (10YR 3/1) organic coatings in root channels; many medium and coarse prominent yellowish brown (10YR 5/6) masses of iron in the matrix; common fine and medium rounded black (10YR 2/1) weakly cemented nodules of iron-manganese oxide throughout; about 2 percent fine gravel; slightly alkaline; gradual wavy boundary. [Combined thickness of Bg horizons is 31 to 61 cm (12 to 24 inches).]
Cg--107 to 152 cm (42 to 60 inches); light brownish gray (2.5Y 6/2) stratified silt loam and loam; massive; friable; few very fine roots; many medium and coarse prominent yellowish brown (10YR 5/6) masses of iron in the matrix; common fine and medium rounded black (10YR 2/1) weakly cemented nodules of iron- manganese oxide throughout; about 2 percent fine gravel; slightly alkaline.
TYPE LOCATION: Edgar County, Illinois, about 4 km (2 1/2 miles) southeast of Chrisman; 201 meters (660 feet) west and 101 meters (330 feet) south of the northeast corner of section 4, T. 15 N., R. 11 W.; USGS Chrisman, Illinois topographic quadrangle; lat. 39 degrees, 47 minutes, 31.9 seconds North, and long. 87 degrees, 38 minutes, 14.3 seconds West; UTM Zone 16S 0445432E 4404891N; NAD 83
RANGE IN CHARACTERISTICS: The particle size control section averages between 18 and 27 percent clay and between 18 and 40 percent sand. The soil to a depth of 152 cm (60 inches) ranges from slightly acid to moderately alkaline. Carbonates are at depths greater than 102 cm (40 inches).
The A horizon has value of 2 or 3 and chroma of 1 or 2. The clay content averages between 18 and 27 percent and the sand content averages between 18 and 40 percent. Individual sub-horizons have as much as 30 percent clay. The rock fragment content averages less than 5 percent.
The Bg horizons has hue of 10YR or 2.5Y, value of 4 to 6, and chroma of 1 to 3. The clay content averages between 18 and 27 percent and the sand content averages between 18 and 40 percent. The rock fragment content averages less than 5 percent. Individual sub-horizons or strata range from 10 to 30 percent clay and from 10 to 60 percent sand.
The Cg horizon to a depth of 60 inches) has hue of 10YR or 2.5Y, value of 4 to 6, and chroma of 1 to 3. The clay content of individual strata ranges from 8 to 30 percent. The sand content averages less than 60 percent but individual strata range from 15 to 90 percent. The rock fragment content ranges from 0 to 15 percent.
COMPETING SERIES: There are no other series in this family.
GEOGRAPHIC SETTING: Brouillett soils are on flood plains commonly adjacent to the stream channel. They are on plane or convex slopes with gradient of less than 2 percent. They formed in dark-colored loamy alluvium primarily in areas of late Wisconsin glaciation. Some pedons contain up to 20 inches of lighter colored overwash. Mean annual air temperature ranges from 50 to 54 degrees F. and mean annual precipitation ranges from 35 to 40 inches. Frost free period ranges from 170 to 200 days, and elevation ranges from 400 to 900 feet above sea level.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Comfrey, Genesee, Landes, Ross, Shoals, and Stonelick soils. The Comfrey soils are poorly drained. The Genesee, Landes, Shoals, and Stonelick soils are not cumulic. Ross soils are better drained and are on slightly higher positions.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Somewhat poorly drained. The potential for surface runoff is negligible to medium. The saturated hydraulic conductivity is moderately high (1.41 to 4.23 micrometers per second). Permeability is moderately slow. The apparent seasonal high water table is at a depth of 31 to 61 cm (1 to 2 feet) from January to May at sometime in most years. This soil is frequently or occasionally flooded for brief periods.
USE AND VEGETATION: Most areas are used for forage production or for cultivated crops. Native vegetation is thought to be either mixed hardwoods or widely scattered mixed hardwoods and prairie grasses and forbs.
DISTRIBUTION AND EXTENT: Northern and central Illinois. Extent is moderate.
MLRA OFFICE RESPONSIBLE: Indianapolis, Indiana
SERIES ESTABLISHED: Edgar County, Illinois 1991.
REMARKS: Brouillett is the shortened version of Brouilletts Creek which is in Edgar County, Illinois.
Taxonomic classification changed to Aquic Cumulic Hapludolls with 3/99 revision.
Diagnostic horizons and features recognized in this pedon are:
mollic epipedon - the zone form the surface of the soil to a depth of 26 inches (A1, A2, and A3 horizons); cumulic property - mollic epipedon more than 24 inches thick and irregular decrease of organic carbon with increasing depth;
cambic horizon - the zone from 26 to 42 inches (Bg1, Bg2 horizons); udic moisture regime; mesic temperature regime.