LOCATION STREATOR ILEstablished Series
TAXONOMIC CLASS: Fine, smectitic, mesic Vertic Endoaquolls
TYPICAL PEDON: Streator silty clay loam, 0 to 2 percent slopes, in a cultivated field at an elevation of 738 feet (224 meters) above mean sea level. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 9 inches (0 to 23 cm); black (10YR 2/1) silty clay loam, dark gray (10YR 4/1) dry; weak fine and medium granular structure; friable; common very fine roots; neutral; clear smooth boundary. (6 to 9 inches or 15 to 23 cm thick)
A--9 to 13 inches (23 to 33 cm); black (10YR 2/1) silty clay loam, dark gray (10YR 4/1) dry; moderate fine granular structure; friable; common very fine roots; neutral; clear smooth boundary. (3 to 8 inches or 8 to 20 cm thick)
BA--13 to 17 inches (33 to 43 cm); dark gray (10YR 4/1) silty clay loam; weak medium prismatic structure parting to moderate fine and very fine subangular blocky; friable; common very fine roots; common fine distinct yellowish brown (10YR 5/4) rounded iron masses with diffuse boundaries throughout the matrix; neutral; clear smooth boundary. (3 to 5 inches or 8 to 13 cm thick)
Bg--17 to 24 inches (43 to 61 cm); gray (5Y 5/1) silty clay; moderate medium prismatic structure parting to moderate fine subangular blocky; firm; common very fine roots; many distinct very dark gray (10YR 3/1) organic coatings on faces of peds; common fine prominent yellowish brown (10YR 5/4) rounded iron masses with diffuse boundaries and common fine prominent black (10YR 2/1) rounded iron-manganese nodules with diffuse boundaries throughout the matrix; neutral; clear smooth boundary. (3 to 8 inches or 8 to 20 cm thick)
Btg1--24 to 33 inches (61 to 84 cm); gray (5Y 5/1) silty clay; moderate medium prismatic structure parting to moderate medium subangular blocky; firm; common very fine roots; many distinct dark gray (10YR 4/1) clay films on faces of peds; common fine prominent yellowish brown (10YR 5/6) rounded iron masses with diffuse boundaries and common fine and medium prominent black (10YR 2/1) rounded iron-manganese nodules with diffuse boundaries throughout the matrix; neutral; gradual smooth boundary.
Btg2--33 to 42 inches (84 to 107 cm); gray (5Y 5/1) silty clay loam; moderate medium prismatic structure parting to moderate medium subangular blocky; friable; few very fine roots; common distinct dark gray (10YR 4/1) clay films on faces of peds; common fine prominent yellowish brown (10YR 5/6) and brown (10YR 5/3) rounded iron masses with diffuse boundaries and common fine and medium prominent black (10YR 2/1) rounded iron-manganese nodules with diffuse boundaries throughout the matrix; neutral; clear wavy boundary. (Combined thickness of the Btg horizon is 16 to 24 inches or 41 to 61 cm.)
2Btg3--42 to 56 inches (107 to 142 cm); grayish brown (2.5Y 5/2) clay; weak medium prismatic structure; firm; few very fine roots; few distinct dark gray (10YR 4/1) clay films on faces of peds; common fine prominent yellowish brown (10YR 5/6) and distinct light olive brown (2.5Y 5/4) rounded iron masses with diffuse boundaries throughout the matrix; many fine faint gray (5Y 6/1) iron depletions lining pores; about 5 percent rock fragments; slightly alkaline; gradual wavy boundary. (12 to 18 inches or 30 to 46 cm thick)
2BCkg--56 to 68 inches (142 to 173 cm); grayish brown (2.5Y 5/2) silty clay; weak coarse prismatic structure; very firm; few very fine roots; common prominent light gray (5Y 7/1) carbonate coatings on faces of peds and lining root pores; common fine prominent yellowish brown (10YR 5/6) and many fine and medium distinct light olive brown (2.5Y 5/4) rounded iron masses with diffuse boundaries and common fine prominent white (10YR 8/1) irregular carbonate nodules throughout the matrix; many fine faint gray (5Y 6/1) iron depletions lining pores; about 5 percent rock fragments; slightly effervescent; moderately alkaline; gradual wavy boundary. (8 to 12 inches or 20 to 30 cm thick)
2Cg--68 to 80 inches (173 to 203 cm); grayish brown (2.5Y 5/2) silty clay; massive; very firm; many fine and medium distinct light olive brown (2.5Y 5/4) rounded iron masses with diffuse boundaries throughout the matrix; common fine faint gray (5Y 6/1) iron depletions throughout the matrix; about 5 percent rock fragments; strongly effervescent; moderately alkaline.
TYPE LOCATION: Marshall County, Illinois; 2,544 feet ((773 meters) north and 150 feet (46 meters) west of southeast corner of sec. 36, T. 29 N., R. 1 E.; USGS Minonk topographic quadrangle; lat. 40 degrees 55 minutes 58 seconds N. and long. 89 degrees 02 minutes and 54 seconds W., NAD 27; UTM Zone 16, 327548 easting and 4533324 northing, NAD 83.
RANGE IN CHARACTERISTICS: The depth to the base of soil development ranges from 40 to 70 inches (102 to 178 cm). The solum typically is neutral but ranges from slightly acid to moderately alkaline. Depth to carbonates ranges from 35 to 60 inches (89 to 152 cm). The loess typically is 35 to 45 inches (89 to 114 cm) thick and ranges from 30 to 50 inches (76 to 127 cm) in thickness. Average clay content in the particle-size control section ranges from 35 to 45 percent. The dominant clay mineral in the loess is smectite and in the glacial till or lakebed sediments is illite. The mean annual soil temperature is estimated to range from 47 to 55 degrees F (8 to 13 degrees C).
The Ap and A horizons have hue of 10YR, value of 2, and chroma of 1 or 2. It commonly is silty clay loam but ranges to silty clay.
The BA or AB horizon where present, has hue of 10YR or 2.5Y, value of 3 to 6, and chroma of 1 or 2. Texture is silty clay loam or silty clay.
The Bg and Btg horizons have hue of 10YR, 2.5Y, 5Y, or N; value of 4 to 6; and chroma of 0 to 2. Texture is silty clay loam, silty clay, or silt loam.
The 2Btg and 2BCkg horizons have hue of 10YR, 2.5Y, 5Y, or N; value of 4 to 6, and chroma of 0 to 2. Texture is silty clay, clay, or silty clay loam.
The 2Cg horizon has hue of 10YR, 2.5Y or 5Y, value of 4 to 6, and chroma of 1 to 6. Texture is silty clay or clay. The moist bulk density ranges from 1.65 to 1.85 g/cm3.
COMPETING SERIES: These are Carlow, Chequest, Cove, Fults, Kalona, Kings, Marna, Moline, Rosedell, Titus, Waldorf, and Woodbury soils. Carlow soils are moderately acid to very strongly acid in the middle third of the series control section. Chequest, Cove, Fults, and Kalona soils do not have carbonates within 60 inches (152 cm). Kings and Moline soils average more than 45 percent clay in the particle-size control section. Marna, Titus, and Woodbury soils average less than 35 percent clay in the lower part of the series control section. Rosedell soils have carbonates within a depth of 35 inches (89 cm). Waldorf soils have a moist bulk density less than 1.65 gm/cc in the lower part of the series control section.
GEOGRAPHIC SETTING: The Streator soils are level to nearly level areas in glacial till plains or lake beds of Wisconsinan Age. Streator soils formed in loess or silty material and in silty clay or clay till or lakebed sediments. Slope gradients commonly are less than one percent but range to 3 percent. Summers are hot and winters are cold. Mean annual temperatures range from 45 to 53 degrees F (7.2 to 11.7 degrees C), and average annual precipitation ranges from 30 to 40 inches (760 to 1020 mm).
GEOGRAPHICALLY ASSOCIATED SOILS: The most common associates are the moderately well drained Wenona and the somewhat poorly drained Rutland soils that form a drainage sequence with the Streator soils. The Streator soils are also associated with the somewhat poorly drained Kernan soils which are better drained and have a lighter colored A horizon.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Poorly drained. Permeability is moderately slow in the loess or silty material and slow in the glacial till or lakebed sediments. The potential for runoff is very low to negligible. The seasonal high water table is within 1 foot (30 cm) of the soil surface and there is occasional ponding during the period of March through June. Saturated hydraulic conductivity is moderately high (1.41 to 4.23 micrometers/s) in the loess or silty material and moderately low to moderately high (0.42 to 1.41 micrometers/s) in the glacial till or lakebed sediments.
USE AND VEGETATION: Used mostly for cultivated crops such as corn and soybeans. Native vegetation is marsh grasses.
DISTRIBUTION AND EXTENT: Northern and eastern Illinois and possibly southeastern Wisconsin. Extent is moderate in MLRA 108.
MLRA OFFICE RESPONSIBLE: Indianapolis, Indiana.
SERIES ESTABLISHED: LaSalle County, Illinois, 1969.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from the surface to a depth of 13 inches (0 to 33 cm) (Ap and A horizons); Cambic horizon - the zone from 13 to 68 inches (33 to 173 cm) (from the base of the Mollic epipedon to the top of the 2Cg horizon).