IDENTIFIERS
Current Taxon Name (Soil Name):
St. Clair
OSD
Series Extent
User Site ID:
1978IL075010
User Pedon ID:
1978IL075010
Lab Information:
Certified Lab Pedon Description -
no
Lab Source ID -
IL SCL
Lab Pedon # -
78IL075010
NCSS Pedon Lab Data NASIS Record ID -
21009
Print Date:
5/8/2025
LOCATION
Location In Web Soil Survey
AOI is roughly a square mile and pedon is marked in the center.
Location in SoilWeb
Location in Google Maps
Std. Latitude:
40.5463904
Std. Longitude:
-88.1020513
Datum:
WGS84
Township:
24N
Range:
10E
Section:
7
PLSS Details:
114 feet N & 783 feet W of SE corner
State:
Illinois
County:
IL075—Iroquois
MLRA:
110—Northern Illinois and Indiana Heavy Till Plain
Non-MLRA Soil Survey Area:
IL075—Iroquois County, Illinois
7.5 Minute USGS Quad:
40088-E1—Buckley, Illinois
PEDON
Describers Name:
K
Current Taxonomic Class:
Fine, illitic, mesic Oxyaquic Hapludalfs
Current Taxon Kind:
series
Pedon Type:
map unit inclusion
Pedon Purpose:
soil survey inventory
Pedon Record Orgin:
PedonPC
Pedon #:
10
Correlated Information:
Soil Name -
St. Clair
PSC -
20 to 70 cm.
Classificaton Date -
1/4/2010
Moisture Class -
udic
Moisture Subclass -
oxyaquic
Sampled As Information:
Soil Name -
Chatsworth
Classificaton Date -
12/1/1978
Dynamic Soil Properties:
Erosion Class -
3
Pedoderm Loose Cover Indicator -
no
Hydric:
no
SITE
Parent Material:
Peoria loess over silty clay glacial till
Landscape:
till plain
Landform:
moraine
Runoff:
high
Drainage Class:
moderately well
Surface Fragments:
Benchmark Soil?:
no
VEGETATION
SITE OBSERVATION
Observation Date:
12/1/1978 (actual site observation date)
Air Photo ID:
Surface Cover Properties:
Site Obs. Cover Kind 1 -
tree cover
Site Obs. Cover Kind 2 -
hardwoods
Pedoderm Loose Cover Indicator -
no
Drained? -
no
Bedded Soil? -
no
Forest Plantation? -
no
Yield Study ID -
Pedon Diagnostic Features
Feature Kind
Feature Depth L-H
Feature Thickness L-RV-H
cm
ochric epipedon
argillic horizon
0—20
20—61
—-
—-
Setting and Climate
Slope
Slope Length USLE
Upslope Length
Elev.
Corr. Elev
Aspect
MAP
REAP
FFD
MAAT
MSAT
MWAT
MAST
MSST
MWST
MFFP
PE Index
Climate Station ID
Climate Station Name
Climate Station Type
%
m
degrees
mm
mm
C
mm
21
—
—
222
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
A11—0 to 13 centimeters (0.0 to 5.1 inches); very dark gray (10YR 3/1), dark grayish brown (10YR 4/2), dry; silt loam; weak fine granular structure; friable; fragments; slightly acid, pH 6.3; abrupt smooth boundary. Lab sample # IL25575
A12—13 to 15 centimeters (5.1 to 5.9 inches); dark grayish brown (10YR 4/2), grayish brown (10YR 5/2), dry; silt loam; weak fine granular structure; friable; fragments; slightly acid, pH 6.3; clear smooth boundary. Lab sample # IL25576
A2—15 to 20 centimeters (5.9 to 7.9 inches); brown (10YR 4/3) silty clay loam; weak coarse platy structure; firm; 25 percent distinct very dark grayish brown (10YR 3/2), moist, organic stains on all faces of peds; fragments; moderately acid, pH 5.8; abrupt smooth boundary. Lab sample # IL25577. discontinuous - phpvsfiid 480184; discontinuous - phpvsfiid 480184
IIB21t—20 to 30 centimeters (7.9 to 11.8 inches); brown (10YR 4/3) silty clay; weak medium platy parts to moderate very fine subangular blocky structure; firm; 50 percent faint dark yellowish brown (10YR 4/4), moist, clay films on all faces of peds; fragments; moderately acid, pH 5.8; abrupt smooth boundary. Lab sample # IL25578. continuous - phpvsfiid 480187; continuous - phpvsfiid 480187
IIB22t—30 to 46 centimeters (11.8 to 18.1 inches); dark grayish brown (2.5Y 4/2) silty clay; 10 percent brown (10YR 4/3) fine distinct mottles; moderate medium prismatic parts to weak fine subangular blocky structure; very firm; 50 percent faint olive brown (2.5Y 4/4), moist, clay films on all faces of peds; fragments; neutral, pH 7.0; gradual smooth boundary. Lab sample # IL25579. continuous - phpvsfiid 480185; continuous - phpvsfiid 480185
IIB31t—46 to 53 centimeters (18.1 to 20.9 inches); dark grayish brown (2.5Y 4/2) silty clay; 10 percent gray (5Y 5/1) fine distinct and 10 percent light olive brown (2.5Y 5/4) fine faint mottles; moderate medium prismatic parts to moderate fine subangular blocky structure; very firm; 50 percent faint dark grayish brown (2.5Y 4/2), moist, clay films on all faces of peds; fragments; slight effervescence, by hcl, unspecified; slightly alkaline, pH 7.6; gradual wavy boundary. Lab sample # IL25580. continuous - phpvsfiid 480190; continuous - phpvsfiid 480190
IIB32t—53 to 61 centimeters (20.9 to 24.0 inches); dark grayish brown (2.5Y 4/2) silty clay; 10 percent gray (5Y 5/1) fine distinct and 10 percent light olive brown (2.5Y 5/4) fine faint mottles; weak fine subangular blocky structure; very firm; 50 percent faint dark grayish brown (2.5Y 4/2), moist, clay films on all faces of peds; fragments; slight effervescence, by hcl, unspecified; slightly alkaline, pH 7.6; gradual wavy boundary. Lab sample # IL25581. continuous - phpvsfiid 480189; continuous - phpvsfiid 480189
IIC1—61 to 89 centimeters (24.0 to 35.0 inches); dark grayish brown (2.5Y 4/2) silty clay; 10 percent gray (5Y 5/1) fine distinct and 10 percent light olive brown (2.5Y 5/4) fine faint and 10 percent gray (5Y 5/1) fine distinct mottles; structureless massive; very firm; 50 percent distinct gray (5Y 5/1), moist, pressure faces on all faces of peds; fragments; strong effervescence, by hcl, unspecified; slightly alkaline, pH 7.6; gradual wavy boundary. Lab sample # IL25582. continuous - phpvsfiid 480186; continuous - phpvsfiid 480186
IIC2—89 to 152 centimeters (35.0 to 59.8 inches); olive gray (5Y 4/2) silty clay; structureless massive; very firm; 50 percent distinct gray (5Y 5/1), moist, pressure faces on all faces of peds; fragments; strong effervescence; moderately alkaline, pH 8.1. Lab sample # IL25583. continuous - phpvsfiid 480188; continuous - phpvsfiid 480188