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

36 Soil Survey of
• “Agronomy” section
• “Forestland” section
• “Wildlife Habitat” section
• “Engineering” section
• “Soil Properties” section
969F—Casco-Rodman complex, 20 to 30
percent slopes
Setting
Landform: Stream terraces, kames, outwash plains,
and moraines
Position on the landform: Backslopes
Slope range: 20 to 30 percent
Typical soil series descriptions with range in
characteristics are 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: 50 percent
Rodman and similar soils: 40 percent
Dissimilar soils: 10 percent
Similar soils:
• soils that contain carbonates at or near the surface
• soils that contain sandy and gravelly deposits at a
depth of more than 20 inches
• soils that have slopes of less than 20 percent or
more than 30 percent
• soils that are moderately eroded
• soils that contain loamy till in the lower part of the
profile
Dissimilar soils:
• the somewhat poorly drained Kane soils in the
lower positions on the landform
• the poorly drained Will soils in depressions
Management
For general and detailed information about
managing this map unit, see the following sections in
Part II of this publication:
• “Forestland” section
• “Wildlife Habitat” section
• “Engineering” section
• “Soil Properties” section
Comfrey Series
Drainage class: Poorly drained
Permeability: Moderate
Landform: Flood plains
Parent material: Loamy alluvium
Slope range: 0 to 2 percent
Taxonomic classification: Fine-loamy, mixed, mesic
Cumulic Endoaquolls
Typical Pedon for MLRA 95B
Typical pedon of Comfrey loam, 0 to 2 percent slopes,
occasionally flooded, 570 feet north and 1,400 feet
west of the center of sec. 25, T. 43 N., R. 2 E.
Ap—0 to 7 inches; black (10YR 2/1) loam, dark gray
(10YR 4/1) dry; weak fine and medium granular
structure; friable; common very fine roots; neutral;
clear smooth boundary.
A1—7 to 15 inches; black (10YR 2/1) loam, dark gray
(10YR 4/1) dry; weak fine and medium granular
structure; friable; common very fine roots; many
distinct black (N 2.5/0) organic coatings on faces
of peds; common fine brown (7.5YR 4/4) very
weakly cemented iron oxide concretions
throughout; neutral; clear smooth boundary.
A2—15 to 26 inches; very dark gray (10YR 3/1) loam,
gray (10YR 5/1) dry; weak fine and medium
granular structure; friable; common very fine roots;
many distinct black (N 2.5/0) organic coatings on
faces of peds; common fine brown (7.5YR 4/4)
very weakly cemented iron oxide concretions
throughout; neutral; clear smooth boundary.
Bg—26 to 37 inches; gray (2.5Y 5/1) silty clay loam;
weak medium prismatic structure parting to weak
medium subangular blocky; friable; common very
fine roots; few distinct very dark gray (2.5Y 3/1)
organic coatings on faces of peds and in pores;
many fine and medium yellowish brown (10YR
5/6) very weakly cemented iron oxide concretions
throughout; common fine distinct gray (10YR 6/1)
iron depletions in the matrix; neutral; gradual
smooth boundary.
Cg1—37 to 57 inches; gray (5Y 5/1), stratified clay
loam and loam; massive; friable; few very fine
roots; many fine and medium yellowish brown
(10YR 5/6) very weakly cemented iron oxide
concretions throughout; common fine prominent
gray (10YR 6/1) iron depletions in the matrix;
neutral; gradual smooth boundary.
Cg2—57 to 63 inches; 40 percent gray (5Y 5/1), 30
percent yellowish brown (10YR 5/6), and 30
percent dark gray (2.5Y 4/1), stratified loam and
sandy loam; massive; friable; 12 percent gravel;
neutral.
MLRA Series Range in Characteristics
Thickness of the mollic epipedon: 24 to 36 inches
Depth to carbonates: Greater than 18 inches