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

McHenry County, Illinois—Part I 33
subangular blocky structure parting to moderate
medium granular; friable; common fine roots;
slightly acid; abrupt smooth boundary.
Bt1—8 to 13 inches; brown (7.5YR 4/4) clay loam;
moderate medium subangular blocky structure;
firm; common fine roots; common distinct brown
(7.5YR 4/3) clay films on faces of peds; slightly
acid; clear smooth boundary.
Bt2—13 to 17 inches; brown (7.5YR 4/4) sandy clay
loam; moderate medium subangular blocky
structure; firm; common fine roots; common
distinct dark brown (7.5YR 3/4) clay films on
faces of peds; common distinct dark brown
(7.5YR 3/2) organic coatings on faces of peds and
on gravel near the lower boundary; about 9
percent gravel in the lower part; neutral; abrupt
wavy boundary.
2C—17 to 60 inches; brown (10YR 5/3), stratified
gravelly coarse sand, very gravelly coarse sand,
and extremely gravelly coarse sand; single grain;
loose; about 60 percent gravel (as an average);
strongly effervescent; moderately alkaline.
MLRA Series Range in Characteristics
Depth to sandy and gravelly deposits: 10 to 20 inches
Depth to carbonates: 10 to 20 inches
Thickness of the solum: 10 to 20 inches
Ap or A horizon:
Hue—7.5YR or 10YR
Value—3 or 4
Chroma—2 or 3
Texture—loam or clay loam
Bt horizon:
Hue—7.5YR or 10YR
Value—4 or 5
Chroma—3 or 4
Texture—clay loam, sandy clay loam, loam, or the
gravelly analogs of these textures
Content of gravel—0 to 35 percent
C horizon:
Hue—7.5YR or 10YR
Value—4 to 6
Chroma—3 or 4
Texture—the gravelly, very gravelly, or extremely
gravelly analogs of sand or coarse sand
Content of gravel—15 to 70 percent
323B—Casco loam, 2 to 4 percent slopes
Setting
Landform: Stream terraces, kames, outwash plains,
and moraines
Position on the landform: Summits, shoulders, and
backslopes
Slope range: 2 to 4 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
Casco and similar soils: 85 percent
Dissimilar soils: 15 percent
Similar soils:
• soils that contain sandy and gravelly deposits at a
depth of more than 20 inches
• soils that have slopes of more than 4 percent
• soils that contain loamy till in the lower part of the
profile
• soils that have a darker surface layer
Dissimilar soils:
• the somewhat poorly drained Kane soils in the
lower positions on the landform
• the excessively drained Rodman soils in the slightly
higher positions on the landform
• the poorly drained Will 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
• “Forestland” section
• “Wildlife Habitat” section
• “Engineering” section
• “Soil Properties” section
323C2—Casco loam, 4 to 6 percent
slopes, eroded
Setting
Landform: Stream terraces, kames, outwash plains,
and moraines
Position on the landform: Backslopes and shoulders
Slope range: 4 to 6 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