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

McHenry County, Illinois—Part I 47
Value—4 to 6
Chroma—0 to 2
Texture—silty clay loam or silt loam
2Btg horizon:
Hue—10YR, 2.5Y, 5Y, or N
Value—5 or 6
Chroma—0 to 2
Texture—loam, silt loam, clay loam, sandy clay
loam, sandy loam, or the gravelly analogs of
these textures
Content of gravel—0 to 20 percent
3Cg or 3C horizon:
Hue—10YR, 2.5Y, 5Y, or N
Value—4 to 7
Chroma—0 to 8
Texture—the gravelly, very gravelly, or extremely
gravelly analogs of sand, loamy sand, coarse
sand, loamy coarse sand, fine sand, loamy fine
sand, or sandy loam
Content of gravel—15 to 70 percent
523A—Dunham silty clay loam, 0 to 2
percent slopes
Setting
Landform: Outwash plains and stream terraces
Position on the landform: Footslopes and toeslopes
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
Dunham and similar soils: 85 percent
Dissimilar soils: 15 percent
Similar soils:
• soils that contain less gravel in the lower part of the
profile
• soils that have a thinner subsurface layer
• soils that contain more sand in the upper one-half of
the profile
• soils that contain sandy and gravelly deposits at a
depth of less than 32 inches or more than 55 inches
• soils that contain carbonates at a depth of more
than 50 inches
Dissimilar soils:
• the somewhat poorly drained Grundelein and
Millstream soils and the well drained Bowes and
Waupecan soils in the higher positions on the
landform
• the very poorly drained Houghton and Palms soils
in depressions
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
Elburn Series
Drainage class: Somewhat poorly drained
Permeability: Moderate
Landform: Outwash plains and till plains
Parent material: Silty material and the underlying
loamy outwash
Slope range: 0 to 2 percent
Taxonomic classification: Fine-silty, mixed, mesic
Aquic Argiudolls
Typical Pedon for MLRA 95B
Typical pedon of Elburn silt loam, 0 to 2 percent
slopes, 2,440 feet south and 195 feet east of the
center of sec. 5, T. 40 N., R. 7 E.
Ap—0 to 9 inches; black (10YR 2/1) silt loam, dark
grayish brown (10YR 4/2) dry; weak very fine
granular structure; friable; common very fine roots;
neutral; clear smooth boundary.
A—9 to 12 inches; very dark grayish brown (10YR
3/2) silt loam, grayish brown (10YR 5/2) dry; weak
fine granular structure; friable; neutral; common
very fine roots; clear smooth boundary.
Bt—12 to 19 inches; brown (10YR 4/3) silty clay loam;
weak very fine subangular blocky structure;
friable; common very fine roots; few distinct dark
grayish brown (10YR 4/2) clay films on faces of
peds; common distinct very dark grayish brown
(10YR 3/2) organic coatings on faces of peds; few
fine distinct yellowish brown (10YR 5/6) masses of
iron accumulation in the matrix; neutral; gradual
smooth boundary.
Btg1—19 to 29 inches; dark grayish brown (10YR 4/2)
silty clay loam; moderate fine 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; few fine distinct