Soil Survey of McHenry County, Illinois Part I - Soil Data Mart

McHenry County, Illinois—Part I 139
Typical Pedon for MLRA 95B
Typical pedon of Will loam, 0 to 2 percent slopes, 85
feet north and 2,020 feet west of the southeast corner
of sec. 13, T. 43 N., R. 2 E.
Ap—0 to 8 inches; black (N 2.5/0) loam, very dark
gray (10YR 3/1) dry; moderate very fine granular
structure; friable; many fine roots; slightly acid;
abrupt smooth boundary.
A—8 to 14 inches; black (N 2.5/0) loam, very dark
gray (10YR 3/1) dry; moderate very fine and fine
subangular blocky structure; friable; many fine
roots; neutral; clear smooth boundary.
Btg1—14 to 19 inches; dark grayish brown (2.5Y 4/2)
loam; moderate fine subangular blocky structure;
friable; common fine roots; common distinct black
(10YR 2/1) organo-clay films on faces of peds;
common black (N 2.5/0) wormcasts; few fine black
(10YR 2/1) iron and manganese oxide concretions
throughout; few fine prominent yellowish brown
(10YR 5/8) masses of iron accumulation in the
matrix; neutral; clear smooth boundary.
Btg2—19 to 25 inches; grayish brown (2.5Y 5/2)
sandy clay loam; moderate fine and medium
subangular blocky structure; friable; common fine
roots; many distinct dark grayish brown (2.5Y 4/2)
clay films on faces of peds; common black
(N 2.5/0) wormcasts; few fine prominent yellowish
brown (10YR 5/8) masses of iron accumulation in
the matrix; 10 percent gravel; neutral; abrupt
smooth boundary.
BCg—25 to 28 inches; 65 percent dark grayish brown
(2.5Y 4/2) and 35 percent very dark brown (10YR
2/2) sandy loam; weak medium subangular blocky
structure; very friable; few fine roots; 12 percent
gravel; slightly effervescent; slightly alkaline;
abrupt smooth boundary.
2Cg1—28 to 32 inches; light olive brown (2.5Y 5/3)
gravelly sand; single grain; loose; few fine
prominent dark reddish gray (5YR 4/2) iron
depletions in the matrix; 20 percent gravel;
strongly effervescent; moderately alkaline; abrupt
smooth boundary.
2Cg2—32 to 36 inches; dark grayish brown (2.5Y 4/2)
gravelly sandy loam with three 1 /4-inch-thick strata
of black (10YR 2/1) sandy loam; massive; friable;
25 percent gravel; strongly effervescent;
moderately alkaline; abrupt smooth boundary.
2Cg3—36 to 60 inches; 60 percent light olive brown
(2.5Y 5/3) and 40 percent light brownish gray
(2.5Y 6/2) very gravelly sand; single grain; loose;
45 percent gravel; strongly effervescent;
moderately alkaline.
MLRA Series Range in Characteristics
Thickness of the mollic epipedon: 10 to 20 inches
Depth to sandy and gravelly deposits: 20 to 40 inches
Depth to carbonates: 20 to 40 inches
Thickness of the solum: 24 to 40 inches
Ap or A horizon:
Hue—10YR, 2.5Y, or N
Value—2 or 3
Chroma—0 to 2
Texture—loam, clay loam, silty clay loam, or silt
loam
Btg horizon:
Hue—10YR, 2.5Y, 5Y, or N
Value—4 to 6
Chroma—0 to 2
Texture—clay loam, loam, sandy clay loam, or
silty clay loam
Content of gravel—less than 15 percent
2Cg horizon:
Hue—10YR, 2.5Y, or 5Y
Value—4 to 6
Chroma—1 to 4
Texture—the gravelly, very gravelly, or extremely
gravelly analogs of sand, loamy sand, coarse
sand, or loamy coarse sand
Content of gravel—30 to 70 percent
329A—Will loam, 0 to 2 percent slopes
Setting
Landform: Outwash plains and stream terraces
Position on the landform: Footslopes and toeslopes
Slope range: 0 to 2 percent
A typical soil series description with range in
characteristics is included, in alphabetical order, in this
section. Additional information specific to this map
unit, such as horizon depth and textures, is available
in the “Soil Properties” section in Part II of this
publication.
Composition
Will and similar soils: 85 percent
Dissimilar soils: 15 percent
Similar soils:
• soils that contain sandy and gravelly deposits at a
depth of more than 40 inches or less than 20 inches
• soils that contain less sand and more silt in the
upper one-half of the profile
• soils that have no subsurface layer