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

130 Soil Survey of
granular structure; friable; common very fine roots;
moderately acid; clear smooth boundary.
A3—27 to 33 inches; very dark brown (10YR 2/2) silt
loam, grayish brown (10YR 5/2) dry; moderate
very fine granular structure; friable; common very
fine roots; moderately acid; clear smooth
boundary.
BA—33 to 39 inches; brown (10YR 4/3) silt loam;
moderate very fine subangular blocky structure;
friable; common distinct very dark grayish brown
(10YR 3/2) organic coatings on faces of peds;
common very fine roots; moderately acid; clear
smooth boundary.
Bt1—39 to 55 inches; brown (10YR 4/3) silty clay
loam; moderate fine and medium subangular
blocky structure; firm; common distinct dark brown
(10YR 3/3) clay films on faces of peds; few very
fine roots; common sand grains; moderately acid;
clear smooth boundary.
2Bt2—55 to 60 inches; 60 percent brown (10YR 4/3)
and 40 percent dark yellowish brown (10YR 4/4)
clay loam; moderate medium subangular blocky
structure; firm; common distinct dark brown (10YR
3/3) clay films on faces of peds; few very fine
roots; 5 percent gravel; moderately acid; clear
smooth boundary.
2Bt3—60 to 67 inches; brown (10YR 4/3) gravelly
sandy loam; weak medium subangular blocky
structure; friable; common distinct dark brown
(10YR 3/3) clay films on faces of peds; 17 percent
gravel; slightly acid; clear smooth boundary.
2Bt4—67 to 75 inches; dark yellowish brown (10YR
4/4) sandy loam; weak coarse subangular blocky
structure; very friable; few distinct brown (10YR
4/3) clay films on faces of peds and in pores; 8
percent gravel; slightly acid; abrupt smooth
boundary.
2Bt5—75 to 79 inches; 55 percent dark yellowish
brown (10YR 4/4) and 45 percent brown (10YR
4/3) clay loam; weak medium angular blocky
structure; firm; few distinct dark brown (10YR 3/3)
clay films on faces of peds and in pores; 10
percent gravel; slightly acid; abrupt smooth
boundary.
2BC—79 to 102 inches; 55 percent dark brown
(7.5YR 3/2) and 45 percent brown (7.5YR 4/2)
gravelly sandy clay loam; weak coarse angular
blocky structure; friable; 18 percent gravel; slightly
alkaline.
MLRA Series Range in Characteristics
Thickness of the mollic epipedon: 20 to 45 inches
Thickness of silty material: 36 to 60 inches
Thickness of the solum: Greater than 60 inches
Ap or A horizon:
Hue—10YR, 2.5Y, or N
Value—2 or 3
Chroma—0 to 3
Texture—silt loam
Bt horizon:
Hue—10YR
Value—3 to 5
Chroma—3 to 6
Texture—silt loam or silty clay loam
2Bt or 2BC horizon:
Hue—7.5YR or 10YR
Value—3 to 5
Chroma—2 to 6
Texture—loam, clay loam, sandy clay loam, sandy
loam, or the gravelly analogs of these textures
Content of gravel—0 to 20 percent
197A—Troxel silt loam, 0 to 2 percent
slopes
Setting
Landform: Outwash plains 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
Troxel and similar soils: 85 percent
Dissimilar soils: 15 percent
Similar soils:
• soils that have a seasonal high water table at a
depth of less than 6 feet
• soils that have a thinner subsurface layer
• soils that contain loamy drift at a depth of more than
60 inches
• soils that contain less clay in the subsoil
Dissimilar soils:
• the loamy Dakota and Dickinson soils in the higher
positions on the landform
• the poorly drained Pella and Thorp soils in the lower
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: