LOCATION LORENZO IL+OH WIEstablished Series
TAXONOMIC CLASS: Fine-loamy over sandy or sandy-skeletal, mixed, active, mesic Typic Argiudolls
TYPICAL PEDON: Lorenzo loam - at an elevation of about 155 meters (510 feet) above mean sea level. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 15 cm (0 to 6 inches); very dark brown (10YR 2/2) loam, dark grayish brown (10YR 4/2) dry; moderate fine and medium granular structure; friable; common very fine roots; neutral; clear smooth boundary. [13 to 23 cm (5 to 9 inches) thick]
AB--15 to 23 cm (6 to 9 inches); dark brown (7.5YR 3/2) loam, brown (7.5YR 5/2) dry; weak medium angular blocky structure; friable; neutral; clear smooth boundary. [0 to 15 cm (0 to 6 inches) thick]
Bt1--23 to 41 cm (9 to 16 inches); brown (7.5YR 4/4) clay loam; weak medium and coarse angular blocky structure; firm; common distinct dark brown (7.5YR 3/2) organo-clay films on faces of peds; 3 percent gravel; slightly acid; abrupt smooth boundary. [13 to 25 cm (5 to 10 inches) thick]
2Bt2--41 to 46 cm (16 to 18 inches); brown (7.5YR 4/4) gravelly loam; weak coarse subangular blocky structure; very friable; few distinct dark brown (7.5YR 3/2) organo-clay films on faces of peds; 20 percent gravel; slightly alkaline; abrupt smooth boundary. [0 to 13 cm (0 to 5 inches) thick]
3C--46 to 152 cm (18 to 60 inches); yellowish brown (10YR 5/4) extremely gravelly sand; single grain; loose; 70 percent gravel; strongly effervescent; moderately alkaline.
TYPE LOCATION: LaSalle County, Illinois; about 3.2 kilometers (2 miles) south of Seneca; 115 meters (378 feet) south and 606 meters (1,988 feet) west of the northeast corner of sec. 35, T. 33 N., R. 5 E.; USGS Seneca topographic quadrangle; lat. 41 degrees 17 minutes 44 seconds N. and long. 88 degrees 36 minutes 58 seconds W., NAD 27; UTM Zone 16, 364686 easting and 4572840 northing, NAD 83.
RANGE IN CHARACTERISTICS: The depth to the base of soil development and the depth to carbonates range from 30 to 61 cm (12 to 24 inches). The series control section ranges from moderately acid to neutral in the upper part and from neutral to moderately alkaline in the lower part.
The A, Ap, or AB horizon has hue of 7.5YR or 10YR, value of 2 or 3 (4 or 5 dry), and chroma of 1 or 2. It is silt loam, loam, sandy loam, or clay loam.
The Bt, 2Bt, or 2BC horizon has hue of 10YR or 7.5YR, and less commonly 5YR; value of 4 or 5; and chroma of 3 to 6. It is commonly clay loam, loam, or sandy clay loam, or their gravelly analogs. Clay content ranges from 20 to 35 percent. Rock fragment content averages between 2 and 15 percent, but some pedons contain as much as 35 percent.
The 3C horizon has hue of 10YR or 7.5YR, value of 4 to 6, and chroma of 3 to 6. It is gravelly sand, gravelly loamy sand, gravelly coarse sand, or gravelly loamy coarse sand, or the very or extremely gravelly analogs of these textures. Clay content ranges from 1 to 5 percent. Rock fragment content averages between 20 and 85 percent.
COMPETING SERIES: This is the Nineveh series. The Nineveh soils are deeper than 61 cm (24 inches) to carbonates.
GEOGRAPHIC SETTING: Lorenzo soils are on outwash plains, stream terraces, kames, eskers, valley trains, and moraines. The soils formed in 30 to 61 cm (12 to 24 inches) of loamy outwash underlain by calcareous sand and gravel. Slope ranges from 0 to 45 percent. Mean annual air temperature ranges from 6 to 12 degrees C (42 to 54 degrees F), mean annual precipitation ranges from 740 to 1020 mm (29 to 40 inches), frost-free period ranges from 125 to 180 days, and elevation ranges from 152 to 311 meters (500 to 1020 feet) above sea level.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the somewhat excessively drained Casco soils, the excessively drained Rodman soils, and Warsaw soils. These soils are on similar landforms. In addition, Rodman soils do not have an argillic horizon, and Warsaw soils are moderately deep to sand and gravel.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained. The potential for surface runoff ranges from low to high. Saturated hydraulic conductivity is moderately high or high (4.23 to 14.11 micrometers/s) in the solum and very high (greater than 141.11 micrometers/s) in the underlying material. Permeability is moderate in the solum and very rapid in the underlying material.
USE AND VEGETATION: The less sloping areas are cultivated. The more sloping are mainly used for pasture. Native vegetation is tall prairie grasses, chiefly bluestem.
DISTRIBUTION AND EXTENT: Northern Illinois, southeastern Wisconsin, and southwestern Ohio. The series is of moderate extent in MLRAs 95B, 98, 108A, 110, and 111A.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Indianapolis, Indiana.
SERIES ESTABLISHED: Will County, Illinois, 1951.
REMARKS: Diagnostic horizons and features recognized in this pedon are: mollic epipedon - the zone from the surface to a depth of 23 cm (0 to 9 inches) (Ap and AB horizons); argillic horizon - the zone from 23 to 46 cm (9 to 18 inches) (Bt1 and 2Bt2 horizons); contrasting particle-size classes - the contact between the 2Bt2 and 3C horizons; udic moisture regime.