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

78 Soil Survey of
friable; common very fine roots; 1 percent gravel;
strongly effervescent; slightly alkaline; clear
smooth boundary.
Bg1—11 to 21 inches; dark gray (2.5Y 4/1) loam;
weak fine and medium subangular blocky
structure; friable; few very fine roots; common fine
prominent yellowish brown (10YR 5/4) masses of
iron accumulation throughout; common fine and
medium faint grayish brown (2.5Y 5/2) iron
depletions throughout; 1 percent gravel; slightly
effervescent; slightly alkaline; gradual wavy
boundary.
Bg2—21 to 30 inches; dark gray (2.5Y 4/1) loam;
weak medium subangular blocky structure; friable;
few very fine roots; common fine strong brown
(7.5YR 4/6) very weakly cemented iron oxide
concretions throughout; black (2.5Y 2.5/1)
krotovina; many medium and coarse faint dark
grayish brown (2.5Y 4/2) and gray (2.5Y 5/1) iron
depletions throughout; common fine and medium
distinct light olive brown (2.5Y 5/4) masses of iron
accumulation throughout; 4 percent gravel; slightly
effervescent; slightly alkaline; gradual wavy
boundary.
Bg3—30 to 38 inches; grayish brown (2.5Y 5/2) loam;
weak medium subangular blocky structure; friable;
few very fine roots; many fine and medium
prominent yellowish brown (10YR 5/6) masses of
iron accumulation throughout; 4 percent gravel;
strongly effervescent; slightly alkaline; gradual
wavy boundary.
BCg—38 to 47 inches; light brownish gray (2.5Y 6/2)
loam; weak medium and coarse subangular
blocky structure; friable; many medium and
coarse prominent dark yellowish brown (10YR
4/6) masses of iron accumulation throughout; 7
percent gravel; strongly effervescent; slightly
alkaline; clear wavy boundary.
Cg—47 to 60 inches; 45 percent light brownish gray
(2.5Y 6/2), 40 percent brown (7.5YR 5/3), and 15
percent grayish brown (2.5Y 5/2), stratified loam,
sandy loam, and loamy coarse sand; massive;
very friable; 14 percent gravel; violently
effervescent; moderately alkaline.
MLRA Series Range in Characteristics
Thickness of the mollic epipedon: 10 to 20 inches
Depth to carbonates: Less than 10 inches
Thickness of the solum: 30 to 50 inches
Ap or A horizon:
Hue—10YR, 2.5Y, or N
Value—2 or 3
Chroma—0 to 2
Texture—loam, silt loam, clay loam, or silty clay
loam
Bg or BCg horizon:
Hue—10YR, 2.5Y, 5Y, or N
Value—4 to 6
Chroma—0 to 2
Texture—loam, silt loam, clay loam, sandy clay
loam, silty clay loam, or sandy loam
Content of gravel—0 to 10 percent
Cg horizon:
Hue—10YR, 2.5Y, or 5Y
Value—4 to 6
Chroma—1 to 3
Texture—loam, silt loam, or sandy loam with strata
of coarser textures
Content of gravel—2 to 15 percent
626A—Kish loam, 0 to 2 percent slopes
Setting
Landform: Outwash plains, stream terraces, and
moraines
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
Kish and similar soils: 85 percent
Dissimilar soils: 15 percent
Similar soils:
• soils that have a thinner subsurface layer
• soils that contain less sand and more silt in the
upper and middle parts of the profile
• soils that contain more gravel in the lower part of
the profile
• soils that contain sandy outwash in the lower part of
the profile
• soils that do not contain carbonates at or near the
surface
Dissimilar soils:
• the somewhat poorly drained Brenton soils in the
higher positions on the landform
• the very poorly drained Houghton and Lena soils in
depressions