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

134 Soil Survey of
oxide nodules and concretions throughout; many
medium prominent brown (7.5YR 4/4) and strong
brown (7.5YR 5/6) masses of iron accumulation in
the matrix; moderately acid; clear smooth
boundary.
Btg3—44 to 49 inches; grayish brown (2.5Y 5/2) silty
clay loam; weak medium and coarse angular
blocky structure; firm; few fine roots; few
prominent gray (N 5/0) clay films on faces of peds;
many fine black (10YR 2/1) iron and manganese
oxide nodules and concretions throughout; many
medium prominent brown (7.5YR 4/4) and strong
brown (7.5YR 5/6) masses of iron accumulation in
the matrix; moderately acid; clear smooth
boundary.
2Btg4—49 to 58 inches; 55 percent grayish brown
(2.5Y 5/2) and 45 percent light brownish gray
(2.5Y 6/2) loam; weak coarse angular blocky
structure; firm; few prominent dark gray (N 4/0)
clay films on faces of peds; few fine black (10YR
2/1) iron and manganese oxide concretions
throughout; many medium prominent brown
(7.5YR 4/4) and strong brown (7.5YR 5/6) masses
of iron accumulation in the matrix; neutral; gradual
smooth boundary.
2C—58 to 60 inches; 55 percent brown (10YR 4/3)
and 45 percent dark yellowish brown (10YR 4/4)
sandy loam; massive; friable; common fine distinct
dark gray (10YR 4/1) and gray (10YR 5/1) iron
depletions in the matrix; slightly alkaline.
MLRA Series Range in Characteristics
Thickness of silty material: 40 to 60 inches
Depth to carbonates: 45 to 70 inches
Thickness of the solum: 42 to 70 inches
Ap or A horizon:
Hue—10YR
Value—2 or 3
Chroma—1 or 2
Texture—silt loam
E horizon:
Hue—10YR
Value—4 to 6
Chroma—1 or 2
Texture—silt loam
Bt or Btg horizon:
Hue—10YR or 2.5Y
Value—4 to 6
Chroma—2 to 4
Texture—silty clay loam
2Bt or 2Btg horizon:
Hue—10YR or 2.5Y
Value—4 to 6
Chroma—2 to 6
Texture—loam, clay loam, sandy loam, or silt loam
2C or 2Cg horizon:
Hue—10YR or 2.5Y
Value—4 to 6
Chroma—2 to 6
Texture—loam, sandy loam, or silt loam
104A—Virgil silt loam, 0 to 2 percent
slopes
Setting
Landform: Moraines, till plains, and outwash 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
Virgil and similar soils: 85 percent
Dissimilar soils: 15 percent
Similar soils:
• soils that have a lighter colored surface layer
• soils that have a thicker surface layer
• soils that contain more sand in the middle part of
the subsoil
Dissimilar soils:
• the poorly drained Pella soils in drainageways
• the well drained McHenry and 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
• “Forestland” section
• “Wildlife Habitat” section
• “Engineering” section
• “Soil Properties” section
Warsaw Series
Drainage class: Well drained
Permeability: Moderate in the upper part and very
rapid in the lower part
Landform: Outwash plains, stream terraces, and kames