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

McHenry County, Illinois—Part I 83
• “Wildlife Habitat” section
• “Engineering” section
• “Soil Properties” section
Lisbon Series
Drainage class: Somewhat poorly drained
Permeability: Moderate in the upper part and
moderately slow in the lower part
Landform: Moraines and till plains
Parent material: Silty material and the underlying
loamy till
Slope range: 0 to 4 percent
Taxonomic classification: Fine-silty, mixed, mesic
Aquic Argiudolls
Typical Pedon for MLRA 95B
Typical pedon of Lisbon silt loam, 0 to 2 percent
slopes, 1,190 feet north and 310 feet east of the
southwest corner of sec. 36, T. 43 N., R. 4 E.
Ap—0 to 7 inches; very dark brown (10YR 2/2) silt
loam, dark grayish brown (10YR 4/2) dry;
moderate fine granular structure, friable; slightly
acid; abrupt smooth boundary.
A—7 to 11 inches; very dark brown (10YR 2/2) silt
loam, dark grayish brown (10YR 4/2) dry;
moderate medium granular structure; friable;
neutral; clear smooth boundary.
BA—11 to 17 inches; brown (10YR 4/3) silty clay
loam; moderate medium subangular blocky
structure; friable; common fine faint dark grayish
brown (10YR 4/2) and few fine faint grayish brown
(10YR 5/2) iron depletions in the matrix;
moderately acid; clear smooth boundary.
Bt1—17 to 23 inches; yellowish brown (10YR 5/4) silty
clay loam; moderate medium subangular blocky
structure parting to strong fine subangular blocky;
friable; common distinct dark grayish brown (10YR
4/2) clay films on faces of peds; few fine distinct
yellowish brown (10YR 5/6) masses of iron
accumulation in the matrix; few fine distinct
grayish brown (10YR 5/2) iron depletions in the
matrix; moderately acid; clear smooth boundary.
Bt2—23 to 28 inches; light olive brown (2.5Y 5/6) silty
clay loam; strong fine angular blocky structure;
firm; common distinct grayish brown (10YR 5/2)
clay films on faces of peds; common fine distinct
yellowish brown (10YR 5/6) masses of iron
accumulation in the matrix; few fine distinct
grayish brown (2.5Y 5/2) iron depletions in the
matrix; neutral; clear smooth boundary.
Bt3—28 to 36 inches; olive brown (2.5Y 4/4) silty clay
loam; weak medium prismatic structure parting to
strong medium angular and subangular blocky;
firm; common distinct grayish brown (10YR 5/2)
and few distinct dark grayish brown (10YR 4/2)
clay films on faces of peds; many medium
prominent grayish brown (10YR 5/2) iron
depletions in the matrix; slightly alkaline; clear
smooth boundary.
2Bt4—36 to 39 inches; yellowish brown (10YR 5/6)
clay loam; weak coarse prismatic structure; firm;
common distinct dark grayish brown (10YR 4/2)
clay films on vertical faces of peds; few fine black
(10YR 2/1) very weakly cemented iron and
manganese oxide concretions throughout; few
medium distinct light yellowish brown (10YR 6/4)
masses of iron accumulation in the matrix;
common medium distinct light brownish gray
(10YR 6/2) iron depletions in the matrix; slightly
effervescent; slightly alkaline; clear smooth
boundary.
2C—39 to 70 inches; light yellowish brown (10YR 6/4)
loam; massive; firm; pale brown (10YR 6/3)
coatings on vertical faces of joints; few fine black
(10YR 2/1) very weakly cemented iron and
manganese oxide concretions throughout; few fine
distinct brownish yellow (10YR 6/6) masses of iron
accumulation in the matrix; common fine
prominent greenish gray (5GY 6/1) iron depletions
in the matrix; strongly effervescent; moderately
alkaline.
MLRA Series Range in Characteristics
Thickness of the mollic epipedon: 10 to 18 inches
Thickness of silty material: 20 to 40 inches
Depth to carbonates: 20 to 40 inches
Thickness of the solum: 24 to 42 inches
Ap or A horizon:
Hue—10YR
Value—2 or 3
Chroma—1 or 2
Texture—silt loam
Bt horizon:
Hue—10YR or 2.5Y
Value—4 to 6
Chroma—2 to 6
Texture—silty clay loam
2Bt horizon:
Hue—7.5YR or 10YR
Value—4 or 5
Chroma—2 to 6
Texture—clay loam or loam
2C horizon:
Hue—7.5YR or 10YR