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

48 Soil Survey of
yellowish brown (10YR 5/6) and pale brown
(10YR 6/3) masses of iron accumulation in the
matrix; slightly acid; gradual smooth boundary.
Btg2—29 to 35 inches; grayish brown (2.5Y 5/2) silty
clay loam; weak medium subangular blocky
structure; firm; few very fine roots; common
distinct dark grayish brown (2.5Y 4/2) clay films on
faces of peds; few fine very dark brown (10YR
2/2) very weakly cemented iron and manganese
oxide concretions throughout; common fine
prominent yellowish brown (10YR 5/6 and 5/8)
masses of iron accumulation in the matrix; neutral;
gradual smooth boundary.
Btg3—35 to 42 inches; grayish brown (2.5Y 5/2) silty
clay loam; weak coarse prismatic structure;
friable; few very fine roots; few distinct dark
grayish brown (2.5Y 4/2) clay films on face of
peds; few fine very dark brown (10YR 2/2) very
weakly cemented iron and manganese oxide
concretions throughout; common medium
prominent yellowish brown (10YR 5/6 and 5/8)
masses of iron accumulation in the matrix; neutral;
gradual smooth boundary.
2BC—42 to 48 inches; light yellowish brown (2.5Y 6/4)
loam; weak coarse prismatic structure; friable; few
fine very dark brown (10YR 2/2) very weakly
cemented iron and manganese oxide concretions
throughout; many medium prominent yellowish
brown (10YR 5/6) masses of iron accumulation in
the matrix; many medium distinct light brownish
gray (2.5Y 6/2) iron depletions in the matrix;
slightly alkaline; abrupt smooth boundary.
2C—48 to 60 inches; 45 percent light yellowish brown
(2.5Y 6/4), 30 percent light brownish gray (2.5Y
6/2), and 25 percent yellowish brown (10YR 5/6),
stratified silt loam and sandy loam; massive; very
friable; 2 percent gravel; slightly effervescent;
moderately alkaline.
MLRA Series Range in Characteristics
Thickness of the mollic epipedon: 10 to 20 inches
Thickness of silty material: 40 to 60 inches
Depth to carbonates: 45 to 70 inches
Thickness of the solum: 45 to 65 inches
Ap or A horizon:
Hue—10YR
Value—2 or 3
Chroma—1 or 2
Texture—silt loam
Bt or Btg horizon:
Hue—10YR or 2.5Y
Value—4 or 5
Chroma—2 to 4
Texture—silty clay loam or silt loam
2BC horizon:
Hue—10YR or 2.5Y
Value—4 to 6
Chroma—2 to 6
Texture—loam, silt loam, sandy loam, clay loam,
or silty clay loam
2C horizon:
Hue—7.5YR, 10YR, or 2.5Y
Value—4 to 6
Chroma—2 to 8
Texture—loam, silt loam, or sandy loam
198A—Elburn silt loam, 0 to 2 percent
slopes
Setting
Landform: Outwash plains and till plains
Position on the landform: Footslopes
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
Elburn and similar soils: 85 percent
Dissimilar soils: 15 percent
Similar soils:
• soils that have no subsurface layer
• soils that contain more sand in the middle part of
the subsoil
• soils that have a seasonal high water table at a
depth of more than 2.5 feet
Dissimilar soils:
• the poorly drained Pella soils in depressions and
drainageways
• the well drained Ringwood soils in the higher
positions on the landform
Management
For general and detailed information about
managing this map unit, see the following sections in
Part II of this publication:
• “Agronomy” section
• “Wildlife Habitat” section
• “Engineering” section
• “Soil Properties” section