LOCATION COYNE IL+IAEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, active, mesic Typic Argiudolls
TYPICAL PEDON: Coyne fine sandy loam in a nearly level cultivated field at an elevation of 180m (590 feet). (Colors are for moist soil unless otherwise stated.)
Ap--0 to 23 cm (0 to 9 inches); very dark gray (10YR 3/1) fine sandy loam, gray (10YR 5/1) dry; weak coarse subangular blocky structure parting to moderate very fine and fine granular; very friable; slightly acid; abrupt smooth boundary.
A1--23 to 33 cm (9 to 13 inches); black (10YR 2/1) fine sandy loam, dark gray (10YR 4/1) dry; weak coarse subangular blocky structure parting to moderate very fine and fine granular; very friable; slightly acid; clear smooth boundary.
A2--33 to 58 cm (13 to 23 inches); very dark gray (10YR 3/1) and very dark grayish brown (10YR 3/2) fine sandy loam, gray (10YR 5/1) and grayish brown (10YR 5/2) dry; moderate fine granular structure; very friable; slightly acid; clear smooth boundary. [Combined thickness of the A horizon is 36 to 71 cm (14 to 28 inches)]
BA--58 to 71 cm (23 to 28 inches); intermingled very dark grayish brown (10YR 3/2), dark brown (10YR 3/3), and dark grayish brown (10YR 4/2) fine sandy loam; weak coarse subangular blocky structure parting to very fine and fine granular; very friable; moderately acid; clear smooth boundary. [0 to 25 cm (0 to 10) inches thick]
Bw--71 to 107 cm (28 to 42 inches); brown (7.5YR 4/4) fine sandy loam; weak coarse subangular blocky structure; very friable; few fine black (10YR 2/1) concretions (Fe & Mn oxides); moderately acid; clear smooth boundary. [25 to 76 cm (10 to 30 inches) thick]
2Bt1--107 to 132 cm (42 to 52 inches); reddish brown (5YR 4/4) silty clay loam; strong medium and coarse subangular blocky structure; firm; many distinct dark reddish brown (5YR 3/3) clay films on faces of peds; moderately acid; abrupt smooth boundary.
2Bt2--132 to 140 cm (52 to 55 inches); reddish brown (5YR 4/4) loam; strong medium and coarse subangular blocky structure; firm; many distinct dark reddish brown (5YR 3/3) clay films on faces of peds; moderately acid; abrupt smooth boundary. [Combined thickness of the 2Bt horizon is 15 to 46 cm (6 to 18 inches)]
3C--140 to 152 cm (55 to 60 inches); brown (7.5YR 4/4) sand and gravel; single grain; loose; moderately acid.
TYPE LOCATION: Rock Island County, Illinois; 244 feet east and 847 feet south of the center of sec. 10, T. 20 N., R. 2 E.; USGS Cordova topographic quadrangle; lat. 41 degrees 44 minutes 3 seconds N. and long.90 degrees 15 minutes 21 seconds W., NAD27.
RANGE IN CHARACTERISTICS: The solum is 122 to 183 cm (48 to 72 inches) thick. The particle-size control section averages 5 to 18 percent clay and 45 to 80 percent fine sand or coarser materials. The upper boundary of the argillic horizon is at a depth greater than 102 cm (40 inches).
The A horizon has hue of 10YR, value of 2 or 3 moist or 3 to 5 dry, and chroma of 1 to 3 moist or dry. It is loam, fine sandy loam, or loamy fine sand. It ranges from moderately acid to neutral.
The Bw horizon has hue of 10YR or 7.5YR, value of 4 or 5, and chroma of 3 to 5. It is loam or fine sandy loam. It has weak or moderate medium or coarse subangular blocky structure and is friable or very friable. It ranges from moderately acid to neutral.
The 2Bt horizon typically has hue of 5YR or 2.5YR, value of 4 to 6, and chroma of 3 to 6. Some thin strata, varves, or subhorizons with hue of 7.5YR or 10YR are within the range. The 2Bt horizon typically is loam, silt loam, or silty clay loam, but some subhorizons are silty clay. It ranges from moderately acid to neutral.
The 3C horizon has hue of 7.5YR or 10YR, value of 3 to 6, and chroma of 3 to 8. It typically is sand or sand and gravel. Some pedons contain strata of clay loam, loam, silty clay loam, or silt loam. It ranges from moderately acid to moderately alkaline. Free carbonates are not present above a depth of 152 cm (60 inches).
COMPETING SERIES: These are the Elston and Hesch series. Elston and Hesch soils have the upper boundary of the argillic horizon at depths less than 102 cm (40 inches). Hesch soils have sandstone bedrock within a depth of 102 cm (40 inches).
GEOGRAPHIC SETTING: These soils are on terraces primarily in the Mississippi River valley and in a few tributary valleys. They also are in the ancient Mississippi River valley known locally in Rock Island and Whiteside Counties, Illinois, as the Meredosia Slough. These soils formed in about 102 to 152 cm (40 to 60 inches) of loamy wind- or water-deposited sediments and the underlying loamy or clayey lacustrine sediments that had their origin from the hemitite-rich rocks of the Lake Superior region. Slope gradients range from 0 to 12 percent. The mean annual temperature is 9 to 11 degrees C (48 to 52 degrees F). The mean annual precipitation is 810 to 990 mm (32 to 39 inches).
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing
Dickinson soils on nearby terrace ridges and the
Joslin,
Trempealeau, and
Sparta soils on similar positions on the landscape. Joslin soils contain more clay and less sand in the upper part of the solum and have the argillic horizon in the wind- or water-deposited sediments in the upper part of the solum. Trempealeau soils have reddish colors throughout the B horizon and are underlain by sandy sediments at depths of less than 102 cm (40 inches). Sparta soils contain more sand
throughout the profile.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained and moderately well drained. Runoff is low or medium. Saturated hydraulic conductivity is 14.11 to 42.34 micrometers per second (moderately rapid permeability) in the wind- or water-deposited sediments, 1.41 to 4.23 micrometers per second (moderately slow permeability) in the lacustrine sediments, and 42.34 to 141.14 micrometers per second (rapid permeability) in the underlying materials.
USE AND VEGETATION: Most areas of Coyne soils are cropped. Corn, soybeans, small grain, and meadow are the principal crops. Native vegetation was prairie grasses.
DISTRIBUTION AND EXTENT: Northwestern Illinois and northeastern Iowa; LRR M, MLRAs 108B and 115C. The series is of small extent.
MLRA OFFICE RESPONSIBLE: Indianapolis, Indiana
SERIES ESTABLISHED: Rock Island County, Illinois, 1972.
REMARKS: Diagnostic horizons and features in this pedon include:
Mollic epipedon - from a depth of 0 to 58 cm (0 to 23 inches) (Ap, A1, and A2 horizons).
Cambic horizon - from a depth of 71 to 107 cm (28 to 42 inches) (Bw horizon)
Argillic horizon - from a depth of 107 to 140 cm (42 to 55 inches) (2Bt horizons)