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

McHenry County, Illinois—Part I 127
masses of iron accumulation in the matrix; 3
percent gravel; moderately acid; gradual smooth
boundary.
2BCg—49 to 60 inches; 50 percent dark yellowish
brown (10YR 4/6), 40 percent gray (10YR 5/1),
and 10 percent gray (10YR 6/1) sandy loam; weak
medium prismatic structure parting to weak
medium subangular blocky; friable; 2 percent
gravel; neutral.
MLRA Series Range in Characteristics
Thickness of the mollic epipedon: 10 to 14 inches
Thickness of silty material: 30 to 54 inches
Depth to carbonates: Greater than 40 inches
Thickness of the solum: 40 to 65 inches
Ap or A horizon:
Hue—10YR
Value—2 or 3
Chroma—1 or 2
Texture—silt loam
E horizon:
Hue—10YR or 2.5Y
Value—4 to 6
Chroma—1 or 2
Texture—silt loam
Btg horizon:
Hue—10YR, 2.5Y, or 5Y
Value—4 to 6
Chroma—1 or 2
Texture—silty clay loam or silt loam
2Btg horizon:
Hue—10YR, 2.5Y, or 5Y
Value—4 to 6
Chroma—1 to 6
Texture—clay loam, loam, silt loam, sandy loam,
or sandy clay loam
2BC horizon:
Hue—10YR, 2.5Y, or 5Y
Value—4 to 6
Chroma—1 to 8
Texture—loam, silt loam, sandy loam, loamy sand,
or sandy clay loam
Content of gravel—less than 15 percent
206A—Thorp silt loam, 0 to 2 percent
slopes
Setting
Landform: Outwash plains, stream terraces, and till
plains
Position on the landform: Depressions
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
Thorp and similar soils: 85 percent
Dissimilar soils: 15 percent
Similar soils:
• soils that have a thinner surface layer
• soils that have a darker subsurface layer
• soils that contain loamy till in the lower part of the
subsoil
Dissimilar soils:
• the somewhat poorly drained Elburn and Virgil soils
in the slightly higher positions on the landform
• soils that contain sandy and gravelly deposits at a
depth of less than 40 inches
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
1206A—Thorp silt loam, 0 to 2 percent
slopes, undrained
Setting
Landform: Outwash plains, stream terraces, and till
plains
Position on the landform: Depressions
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
Thorp and similar soils: 85 percent
Dissimilar soils: 15 percent
Similar soils:
• soils that have a thinner surface layer
• soils that have a darker subsurface layer