LOCATION JOSLIN ILEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Typic Argiudolls
TYPICAL PEDON: Joslin silt loam - on a gently sloping stream terrace along the Mississippi River. (cultivated) (Colors are for moist soil unless otherwise stated.)
Ap--0 to 8 inches; black (10YR 2/1) silt loam; dark gray (10YR 4/1) dry; moderate fine and medium granular structure; friable; few sand grains mildly alkaline; abrupt smooth boundary. (6 to 10 inches thick)
A--8 to 14 inches; mixed very dark gray (10YR 3/1) and black (10YR 2/1) silt loam; moderate fine and medium granular structure; friable; few sand grains; neutral; clear smooth boundary. (4 to 7 inches thick)
BA--14 to 18 inches; mixed brown (10YR 4/3), dark brown (10YR 3/3), and very dark gray (10YR 3/1) silt loam; weak fine and medium subangular blocky structure; friable; root channels lined with black (10YR 2/1) organic coats; light gray (10YR 7/1) silt coats on faces of peds dry; few sand grains; slightly acid; clear smooth boundary. (0 to 6 inches thick)
Bt1--18 to 28 inches; brown (10YR 4/3) silt loam; moderate medium and coarse subangular blocky structure; friable; common distinct dark brown (10YR 3/3) clay films on faces of peds; some very dark grayish brown (10YR 3/2) and very dark gray (10YR 3/1) coatings in root channels; 22 percent sand; few pebbles; few worm casts; slightly acid; gradual smooth boundary. (7 to 12 inches thick)
Bt2--28 to 37 inches; yellowish brown (10YR 5/4) silt loam; weak medium prismatic structure, parting to moderate medium subangular blocky ; firm; common distinct dark brown (7.5YR 4/2) clay films; few root channels filled with black (10YR 2/1) material; 12 percent sand; medium acid; gradual smooth boundary. (7 to 13 inches thick)
Bt3--37 to 48 inches; yellowish brown (10YR 5/4) silt loam; weak coarse prismatic structure; friable; common distinct dark brown (7.5YR 4/2) clay films; few root and worm channels filled with black (10YR 2/1) material; few small spots of reddish brown (2.5YR 4/4) silty clay from horizon below; 3 percent sand; slightly acid; clear smooth boundary. (Combined thickness of the Bt horizon ranges from 21 to 37 inches.)
2Bt4--48 to 60 inches; reddish brown (2.5YR 4/4) silty clay; moderate medium and coarse prismatic structure; very firm; few distinct weak red (2.5YR 4/2) clay films; few root channels filled with brownish yellow (10YR 6/6) material; neutral; abrupt smooth boundary. (6 to 18 inches thick)
3C--60 to 85 inches; variegated grayish brown (10YR 5/2), light brownish gray (10YR 6/2), yellowish brown (10YR 5/4 and 5/6), brownish yellow (10YR 6/6), and strong brown (7.5YR 5/6) silt loam; massive; few spots of reddish brown (2.5YR 4/4) silty clay from horizon above; few dark (iron-manganese) concretions; moderately alkaline.
TYPE LOCATION: Rock Island County, Illinois; about one mile north of Hampton, Illinois, 1,980 feet north and 578 feet east of the southwest corner of the southeast quarter, sec. 8, T. 18 N., R. 1 E.
RANGE IN CHARACTERISTICS: The depth of soil development ranges form 48 to 72 inches. The depth to the reddish clayey material ranges from 40 to 60 inches below the surface. The control section ranges from medium acid to neutral.
The upper part of the control section (Ap or A horizon) has value of 2 or 3 and chroma of 1 to 3. It is silt loam or loam.
The next part of the control section (Bt horizons) has hue of 10YR or 7.5YR, value of 4 or 5, and chroma of 3 to 5. It is silt loam or loam.
The next part of the control section (2Bt or 2BC horizon) has hue of 2.5YR, value of 4 to 6, and chroma of 4 to 6. It is silty clay loam, silty clay, or clay averaging between 35 and 50 percent clay.
The lower part of the control section (3C horizon to a depth of 60 inches) is silt loam, silty clay loam, loam, or clay loam. In some pedons it is stratified. It ranges from medium acid to moderately alkaline.
COMPETING SERIES: These are the Atkinson, Barce, Burchard, Calmar, Corwin, Cresco, Durand, Foresman, Friesland, Griswold, Hitt, Hochheim, Jasper, La Rose, Linkville, Markesan, Moingona, Mona, Morrill, Pana, Parr, Plattville, Prairieville, Ringwood, Rockton, Rotamer, Schoolcraft, Shelby, Sibleyville, Symerton, Tippecanoe, Velma, Wea, and Winnebago series. Atkinson, Durand, Morrill, and Winnebago soils average more than 27 percent clay in the textural control section. Barce, Corwin, Cresco, Foresman, Friesland, Griswold, Hochheim, Jasper, La Rose, Linkville, Markesan, Moingona, Mona, Pana, Parr, Plattville, Prairieville, Ringwood, Rockton, Rotamer, Schoolcraft, Shelby, Symerton, Tippecanoe, Velma, and Wea soils do not have horizons with greater than 35 percent clay than have hue of 2.5YR. Calmar, Rockton, and Sibleyville soils have a lithic contact within a depth of 60 inches.
GEOGRAPHIC SETTING: These soils primarily are on the Mississippi River valley terraces and in a few tributary valleys. They also are in the ancient Mississippi River valley in Rock Island and Whiteside Counties, Illinois, known locally as the Meredosia slough. These soils formed in 40 to 60 inches of loamy material and in reddish, clayey, hematite-rich lacustrine deposits. Slope gradients range from 0 to 6 percent. Winters are cold and summers are hot. Mean annual air temperature ranges from 48 to 54 degrees F. Mean annual precipitation ranges from 29 to 37 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Coyne and Trempealeau soils. These soils are on similar terrace landscapes. Coyne soils have sandier A and upper B horizons and less clay in the 2B horizon. Trempealeau soils are underlain by sand between depths of 20 and 40 inches.
DRAINAGE AND PERMEABILITY: Well drained. Permeability is moderate in the A and B horizons and moderately slow in the 2B horizons. Runoff is slow to medium.
USE AND VEGETATION: Joslin soils are used mostly to grow corn, small grain, and meadow crops. Native vegetation is grasses.
DISTRIBUTION AND EXTENT: Northwestern Illinois and possibly northeastern Iowa and southwestern Wisconsin. Known extent is small. Estimated acreage in Illinois is 3,000 acres.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Indianapolis, Indiana
SERIES ESTABLISHED: Rock Island County, Illinois, 1972.
REMARKS: The reddish, clayey horizons may be a paleosolic B horizon.
Diagnostic horizons and features recognized in this pedon are: mollic epipedon -- the zone from the surface to a depth of 14 inches (Ap and A horizons); argillic horizon -- the zone from approximately 18 to 37 inches (Bt1 and Bt2 horizons); lithologic discontinuity at 48 inches; udic moisture regime.