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

92 Soil Survey of
MLRA Series Range in Characteristics
Thickness of the mollic epipedon: 10 to 18 inches
Depth to carbonates: 30 to 52 inches
Thickness of the solum: 30 to 52 inches
Ap or A horizon:
Hue—10YR
Value—2 or 3
Chroma—1 or 2
Texture—silt loam or silty clay loam
Bt or Btg horizon:
Hue—10YR or 2.5Y
Value—4 to 6
Chroma—2 to 4
Texture—silty clay loam or silty clay
Cg or C horizon:
Hue—10YR or 2.5Y
Value—4 to 6
Chroma—1 to 6
Texture—silt loam, silty clay loam, clay loam,
loam, or sandy loam
189A—Martinton silt loam, 0 to 2 percent
slopes
Setting
Landform: Lake 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
Martinton and similar soils: 90 percent
Dissimilar soils: 10 percent
Similar soils:
• soils that contain less clay in the subsoil
• soils that have a thinner subsurface layer
• soils that contain sandy and gravelly deposits in the
lower part of the profile
Dissimilar soils:
• poorly drained soils in depressions and
drainageways
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
McHenry Series
Drainage class: Well drained
Permeability: Moderate
Landform: Moraines and till plains
Parent material: Silty material and the underlying
loamy till
Slope range: 2 to 4 percent
Taxonomic classification: Fine-loamy, mixed, mesic
Typic Hapludalfs
Typical Pedon for MLRA 95B
Typical pedon of McHenry silt loam, 2 to 4 percent
slopes, 60 feet south and 900 feet east of the
northwest corner of sec. 17, T. 45 N., R. 8 E.
A—0 to 5 inches; very dark gray (10YR 3/1) silt loam,
gray (10YR 5/1) dry; moderate fine and medium
granular structure; friable; common very fine and
fine roots; many distinct very dark grayish brown
(10YR 3/2) organic coatings on faces of peds and
in pores; slightly acid; abrupt smooth boundary.
E—5 to 10 inches; brown (10YR 4/3) silt loam; weak
thin platy structure; friable; common very fine
roots; few distinct dark brown (10YR 3/3) organic
coatings on faces of peds and in pores; slightly
acid; abrupt smooth boundary.
BE—10 to 14 inches; dark yellowish brown (10YR 4/4)
silt loam; weak fine subangular blocky structure;
friable; common very fine roots; few distinct dark
brown (10YR 3/3) organic coatings on faces of
peds and in pores; slightly acid; clear smooth
boundary.
Bt1—14 to 22 inches; dark yellowish brown (10YR
4/4) silty clay loam; moderate fine and medium
subangular blocky structure; friable; common very
fine roots; few distinct brown (10YR 4/3) clay films
on faces of peds and in pores; slightly acid; clear
smooth boundary.
2Bt2—22 to 32 inches; dark yellowish brown (10YR
4/4) loam; moderate medium subangular blocky
structure; firm; common very fine roots; few
distinct brown (10YR 4/3) clay films on faces of
peds and in pores; 4 percent gravel; strongly acid;
clear smooth boundary.
2Bt3—32 to 37 inches; dark yellowish brown (10YR
4/4) fine sandy loam; weak medium subangular
blocky structure; friable; common very fine roots;
common distinct brown (10YR 4/3) clay films on