Nor
th
For
k
Lake Clinton
LakeDecatur
Mack
inaw
Mackinaw River
R
iver
Suga
r
Cre
ek
Suga
r
Creek
Deer
Cre
ek
Salt
C
reek
Lake Fork
W
est
For
k
Mid
dle
Fork
Kicka
poo
Creek
K
icka
poo
Cre
ek
Long Point Creek
Ten
Mile C
re
ek
San
gamon Riv
er
Sa
ngam
on
R
iver
Sal
t
Cre
ek
Sangamon River
Spr
in
g Creek
Middle Fork Verm
ilion R
iver
Big Four Ditch
B
ig D
itch
Spoon R
iver
Salt Fork
Sal
ine
Bran
ch
Em
barras R
iver
Goose Creek
Frie
nds
C
reek
Kas
kask
ia R
iver
Normal
Bloomington
Gibson City
Sibley
Paxton
Le Roy
Mackinaw
Danvers
Heyworth
Atlanta
Farmer City
Mahomet
Lincoln
Clinton
Champaign Urbana
Rantoul
Monticello
Bement
Pesotum
Homer
Ogden
Rankin
St. Joseph
Tolono
MountPulaski
Decatur
150
150
51
51
51
74
15074
15074
150
74
9
9 9
9
115
9
122
136 136136
55
55
55
10
10
54
54
48
54
54
121
121
48
72
72
105
57
45
57
45
57
45
130
49
165
47
47
47
10
49
49
39
WOODFORD CO.
MC LEAN CO.
TAZEWELL CO.
LOGAN CO.
LOGAN CO.
SANGAMON CO.
DE WITT CO.
MACON CO.
MA
CO
N C
O.
PIA
TT
CO
.
CH
AM
PA
IGN
CO
.
PIA
TT
CO
.
VER
MIL
ION
CO
.
CH
AM
PA
IGN
CO
.
DE
WIT
T CO
.PI
ATT
CO
.
MC LEAN CO.
DE WITT CO.
FORD CO.
CHAMPAIGN CO.
IROQUOIS CO.
FORD CO.
MC
LEA
N C
O.
LO
GA
N C
O.
MC
LEA
N C
O.
40° 30'
89°
40°
88°
Location of cross-section traverses. End moraines, a significant topographic feature on the cross sections,are shown for reference. Moraines are from a smaller scale map by Willman and Frye (1970).
Base map sources: Drainage from USGS 1:100,000-scale Digital Line Graph files. Countyboundaries from ISGS and roads from Illinois Department of Natural Resources (IDNR);both data sets digitized from USGS 1:24,000- and 1:62,500-scale topographic maps.Municipal boundaries from IDNR, adapted from U.S. Census Bureau TIGER line files
Universal Transverse Mercator projection
Figure 18.—Perspective-view fence diagram composed of cross sectionsA–A’ through I–I’ from figure 17. Stratigraphic units are the same as thoseshown in the cross sections. Viewpoint is from the southeast. Vertical exag-geration approximately 85x.
CH
AT
SW
OR
TH
MO
RA
I NE
EL
LI
S
M
OR
AI
N E E L L
I S M
O
RA
I NE
PA
XT
ON
M
OR
A
I NE
P A X T O N MO
RA
I N
E
I
LL
IA
NA
M
OR
A
I N I C S Y S T E
M I L L I A N A M
OR
AI N
I C S YS T E M
U
RB
AN
A
M
OR
AI N
E
RA
NT
OU
L
MO R A I N
E
U
RB
AN
A M O
R A I N E
HI L
DR
ET
H M O
RA
I N E
CH
AM
PA
I GN
MO
RA
I NE
R
I DG
E F A R M M O R AI N E
WE
ST
RI D
GE
MO
RA
I NE
PE
SO
TU
M M
OR
AI N
E
CE
R R O
G
O
RD
O
MO
RA
I NE
H E Y W
OR
TH
MO
RA
I NE
HE Y W ORTH MORAIN
E
S H E L B Y V I L L E MO
RA
I NE
SH
EL
BY
VI L
LE
MO
RA
I NE
L E R O Y M O R A I N E L E R O Y M O R A I N E
S H I R L E Y M O R A I N E
B L O O M I N G T O N MO
RA
I NE B L O O M I N G T O N M
OR
AI N
E
NO
RM
AL M O R A I N E N O R M A L M O R A I N E
F L E T C H E R S M O R A I N
E
EL P A S O M O R A I N E
M I N O N K M O R A I N E
E UR
EK
A M O R A I N E E U R E K A M
OR
AI N
E
CHAMPAIGN MO
RA
INE
E' D' C' B' A'
E D C B A
F
G
H
I
J
F'
G'
H'
I'
J'
SCALE 1:250 000
5 50 10 15 20 25 KILOMETERS
105 0 5 15 20 MILES
THREE-DIMENSIONAL GEOLOGIC MAPS OF QUATERNARY SEDIMENTS IN EAST-CENTRAL ILLINOISBy
David R. Soller,1 Susan D. Price,1 John P. Kempton,2 and Richard C. Berg3
1999
Prepared in cooperation with theILLINOIS STATE GEOLOGICAL SURVEY
AUTHOR AFFILIATIONS1U.S. Geological Survey, 908 National Center, Reston, VA 20192
Email: [email protected] State Geological Survey (emeritus)3Illinois State Geological Survey, Natural Resources Building,
615 East Peabody Drive, Champaign, IL 61820Email: [email protected]
INTERIOR—GEOLOGICAL SURVEY, RESTON, VA—1999
U.S. DEPARTMENT OF THE INTERIORU.S. GEOLOGICAL SURVEY
GEOLOGIC INVESTIGATIONS SERIESMAP I–2669 (SHEET 3 OF 3)
Figure 19.—Horizontal “slices” through the geologic materials in the map area, showing the stratigraphic units encounteredat different elevations above sea level. Viewpoint is from the south; vertical exaggeration is approximately 30x. Slices areshown from elevation 775 ft to 350 ft, in 25-foot increments. The upper left diagram shows the land surface, where ele-vations approach 950 ft; slices between 950 ft and 775 ft were omitted because they did not expose underlying units.Stratigraphic units are the same as those shown in the cross sections. Note in particular the gradual filling of the MahometBedrock Valley, from pre-Illinois time into the Wisconsin Episode.
Land surface
Elevation 775 ft
Elevation 750 ft
Elevation 725 ft
Elevation 675 ft
Elevation 650 ft
Elevation 625 ft
Elevation 700 ft
Elevation 550 ft
Elevation 525 ft
Elevation 575 ft
Elevation 600 ft
Elevation 425 ft
Elevation 500 ft
Elevation 400 ft
Elevation 375 ft
Elevation 350 ft
Elevation 475 ft
Elevation 450 ft
EXPLANATION OF STRATIGRAPHIC UNITSAs shown in figure 17 (cross sections) and figures 18 and 19
Upper Glasford Formation (Illinois Episode)
Upper Glasford basal sand
Lower Glasford Formation (Illinois Episode)
Lower Glasford basal sand
Upper Banner Formation (pre-Illinois Episode)
Middle Banner Formation—mostly Mahomet Sand Member (pre-Illinois Episode)
Bedrock (undifferentiated)
Wedron and Mason Groups, including Cahokia Formation(Wisconsin and Hudson Episodes). This unit is assigned a mini-mum thickness of 15 ft
Figure 17.—Cross sections along nine straight-line traverses andalong one traverse (section J–J’) that follows the Mahomet BedrockValley thalweg (the thalweg is the valley axis, connecting the deepestpoints along the valley). Cross sections were computed from thethree-dimensional model of stratigraphic units based on the elevationmaps shown in figure 14 (sheet 2). Difficulties were encountered inmapping the stratigraphic unit comprising the Wedron and MasonGroups and Cahokia Formation, especially in the southwestern partof the study area, where these sediments are thin or absent. To inte-grate this unit with the upper Glasford Formation, which is in placesexposed, required assigning the Wedron and Mason Groups andCahokia Formation a minimum thickness of 15 ft (see discussion onsheet 1 under “An internally consistent geologic model and set ofmaps,” fourth paragraph). This permitted a smooth integration ofthe Wedron and Mason Group surface with the upper GlasfordFormation surface across the area. The assumption of a minimumthickness also affects areas where modern streams have incisedGlasford Formation and older deposits; there, the top of the olderdeposits in these valleys has been effectively lowered by 15 ft, pro-ducing a minimum 15-foot thickness of Cahokia Formation alluviumin the riverbeds. The presence of Cahokia Formation alluvium is rea-sonable and is generally supported by field observations. However,as a consequence of the assumed minimum 15-foot thickness, thinsurficial deposits also are shown along valley margins where theymay not actually occur; in such places, modern erosion has locallyexposed upper Glasford Formation and older deposits.
SECTIONF-F'
SECTIONG-G'
SECTIONJ-J'
SECTIONH-H'
SECTIONI-I'
De Witt Co.
Macon Co.
McLean Co.
De Witt Co.
Salt Creek
Ten Mile Creek
Kickapoo Creek
Sugar Creek
LE ROY MORAINE
SHIRLEY MORAINE
HEYWORTH MORAINE
BLOOMINGTON MORAINE
EUREKA MORAINE
NORMAL MORAINE
VE
RTI
CA
L E
XA
GG
ER
ATIO
N X
140
PR
OX
IMA
L S
LOP
E O
FS
HE
LBY
VIL
LE M
OR
AIN
E80
0
550
600
650
700
750
500
450
400
350
175
200
225
250
125
100
150
850
MET
ER
SD
'
900
FEET
D
SE
CTI
ON
E-E
'
SE
CTI
ON
D-D
'
SE
CTI
ON
B-B
'
SE
CTI
ON
A-A
'
SE
CTI
ON
C-C
'
VERTICAL EXAGGERATION X 140
Log
an C
o.
Mac
on C
o.
Mac
on C
o.
Pia
tt C
o.
Pia
tt C
o.
Cha
mpai
gn C
o.
Cha
mpai
gn C
o.
Ver
mili
on C
o.
Lak
e Fo
rk
San
gam
on R
iver
Frie
nds
Cre
ek
Kas
kask
ia R
iver
Em
barr
as R
iver
AP
PR
OX
IMA
TE
BO
UN
DA
RY
O
F W
ED
RO
N G
RO
UP
SH
ELB
YV
ILLE
MO
RA
INE
CERRO GORDO MORAINE
PE
SO
TU
M M
OR
AIN
E
RID
GE
FA
RM
MO
RA
INE
WE
ST
RID
GE
MO
RA
INE
550
600
650
700
750
500
450
400
350
175
200
125
100
150
METERSF'
FEETF
225
SE
CTI
ON
E-E
'
SE
CTI
ON
D-D
'
SE
CTI
ON
J-J'
SE
CTI
ON
B-B
'
SE
CTI
ON
A-A
'SE
CTI
ON
C-C
'
SE
CTI
ON
J-J'
VERTICAL EXAGGERATION X 140
Log
an C
o.
De
Witt
Co.
De
Witt
Co.
Pia
tt C
o.
Pia
tt C
o.
Cha
mpai
gn C
o.
Cha
mpai
gn C
o.
Ver
mili
on C
o.
Dee
r C
reek
Ten
Mile
Cre
ek
Nor
th F
ork
Sal
t C
reek
Lake Clinton
San
gam
on R
iver
Sal
ine
Bra
nch
Sal
t Fo
rk
AP
PR
OX
IMA
TE
BO
UN
DA
RY
OF
WE
DR
ON
GR
OU
P
SH
ELB
YV
ILLE
MO
RA
INE
HEY
WO
RT
HM
OR
AIN
E
CE
RR
O G
OR
DO
MO
RA
INE
CH
AM
PAIG
NM
OR
AIN
E
UR
BA
NA
MO
RA
INE
550
600
650
700
750
500
450
400
350
175
200
225
125
100
150
METERSG'
800FEET
G
SE
CTI
ON
E-E
' SE
CTI
ON
J-J'
SE
CTI
ON
D-D
'
SE
CTI
ON
B-B
'
SE
CTI
ON
J-J'
SE
CTI
ON
A-A
'
SE
CTI
ON
C-C
'
Taze
wel
l Co.
McL
ean
Co.
McL
ean
Co.
Cha
mpai
gn C
o.
Cha
mpai
gn C
o.
Ver
mili
on C
o.
Wes
t Fo
rk
Sug
ar C
reek K
icka
poo
Cre
ek
Mid
dle
Fork
Sal
t C
reek
Mid
dle
Fork
Ver
mili
on R
iver
San
gam
on R
iver
CH
AM
PAIG
NM
OR
AIN
E
VERTICAL EXAGGERATION X 140
CREST OF LE ROY MORAINE
ILLIANA MORAINIC SYSTEM
550
600
650
700
750
500
450
400
350
175
200
225
125
100
150
METERSH'
800FEET
H
SE
CTI
ON
E-E
'
SE
CTI
ON
D-D
'
SE
CTI
ON
B-B
'
SE
CTI
ON
A-A
'
SE
CTI
ON
C-C
'
Taze
wel
l Co.
McL
ean
Co. M
cLea
n C
o.
Ford
Co.
Ford
Co.
Iroq
uois
Co.
Mac
kin
aw R
iver
Mac
kin
aw R
iver
Spr
ing
Cre
ek
EU
RE
KA
MO
RA
INE
FLE
TC
HE
RS
MO
RA
INE
EL
PAS
O M
OR
AIN
E
CH
AT
SW
OR
TH
MO
RA
INE
PAX
TON
MO
RA
INE
ELL
IS M
OR
AIN
E
VERTICAL EXAGGERATION X 140
ILLIANA MORAINIC SYSTEM
550
600
650
700
750
500
450
400
350
175
200
125
100
150
225
250
METERSI'
800
850
900FEET
I
SE
CTI
ON
E-E
'
SE
CTI
ON
H-H
'
BE
ND
INS
EC
TIO
N
SE
CTI
ON
D-D
'
SE
CTI
ON
G-G
'
SE
CTI
ON
G-G
' SE
CTI
ON
B-B
'
SE
CTI
ON
H-H
'
SE
CTI
ON
A-A
'
Taze
wel
l Co.
McL
ean
Co. M
cLea
n C
o.
De
Witt
Co.
De
Witt
Co.
Mac
on C
o. Mac
on C
o.
Pia
tt C
o.
Pia
tt C
o.
Cha
mpai
gn C
o.
Cha
mpai
gn C
o.
Ford
Co.
Ford
Co.
Ver
mili
on C
o.
Wes
t Fo
rk
Mid
dle
Fork
Sug
ar C
reek
Kic
kapo
o C
reek
Lon
g P
oin
t C
reek
Sal
t C
reek
Nor
th F
ork
Frie
nds
Cre
ek
San
gam
on R
iver
San
gam
on R
iver
San
gam
on R
iver
Mid
dle
Fork
Ver
mili
on R
iver
LE R
OY
MO
RA
INE
HEY
WO
RT
H M
OR
AIN
E
BE
ND
INS
EC
TIO
N
BE
ND
INS
EC
TIO
N
BE
ND
INS
EC
TIO
N
SE
CTI
ON
C-C
'BE
ND
INS
EC
TIO
N
BE
ND
INS
EC
TIO
N
BE
ND
INS
EC
TIO
N
BE
ND
INS
EC
TIO
N BE
ND
INS
EC
TIO
N
BE
ND
INS
EC
TIO
N
BE
ND
INS
EC
TIO
N
BE
ND
INS
EC
TIO
N
BE
ND
INS
EC
TIO
N
CH
AM
PAIG
N M
OR
AIN
E
CE
RR
O G
OR
DO
MO
RA
INE
PAX
TON
MO
RA
INE
ELL
IS M
OR
AIN
E
CH
AT
SW
OR
TH
MO
RA
INE
VERTICAL EXAGGERATION X 140
Lake Clinton
ILLIANA MORAINIC SYSTEM
550
600
650
700
750
500
450
400
350
175
200
125
100
150
225
250
METERSJ'
800
850FEET
J
VE
RTI
CA
L E
XA
GG
ER
ATIO
N X
140
ILLI
AN
A M
OR
AIN
ICS
YS
TE
M80
0
550
600
650
700
750
500
450
400
350
FEET
A
175
200
225
125
100
MET
ER
SA
' 150
RIDGE FARM MORAINE
HILDRETH MORAINE
SECTIONF-F'
SECTIONG-G'
SECTIONH-H'
SECTIONJ-J'
Ford Co.
Champaign Co.
Iroquois Co.
Ford Co.
SECTIONI-I'
URBANA MORAINE
ELLIS MORAINE
PAXTON MORAINE
CHATSWORTH MORAINE
Salt Fork
Middle Fork Vermilion River
VE
RTI
CA
L E
XA
GG
ER
ATIO
N X
140
CR
ES
T O
F P
ES
OT
UM
MO
RA
INE
ILLI
AN
A M
OR
AIN
ICS
YS
TE
M
800
550
600
650
700
750
500
450
400
350
175
200
225
250
125
100
150
850
FEET
BM
ETE
RS
B'
SECTIONF-F'
SECTIONG-G'
SECTIONJ-J'
SECTIONH-H'
Ford Co.
Champaign Co.
SECTIONI-I'
CHAMPAIGN MORAINE
RANTOUL MORAINE
VE
RTI
CA
L E
XA
GG
ER
ATIO
N X
140
BLO
OM
ING
TON
MO
RA
INE
800
550
600
650
700
750
500
450
400
350
175
200
225
250
125
100
150
850
900
FEET
CM
ETE
RS
C'
SECTIONF-F'
SECTIONJ-J'
SECTIONG-G'
SECTIONH-H'
De Witt Co.
Piatt Co.
McLean Co.
De Witt Co.
SECTIONI-I'
CERRO GORDO MORAINE
LE ROY MORAINE
NORMAL MORAINE
EUREKA MORAINE
FLETCHERS MORAINE
EL PASO MORAINE
Sangamon River
Goose Creek
Salt Creek
Mackinaw River
SECTIONF-F'
SECTIONG-G'
SECTIONH-H'
SECTIONJ-J'
SECTIONI-I'
Logan Co.
Sangamon Co.
Tazewell Co.
Logan Co.
Woodford Co.
Tazewell Co.
Salt Creek
Lake Fork
Deer Creek
Kickapoo Creek
Sugar Creek
Middle Fork
West Fork
Mackinaw River
APPROXIMATE BOUNDARYOF WEDRON GROUP
SHELBYVILLE MORAINE
LE ROY MORAINE
BLOOMINGTON MORAINE
VE
RTI
CA
L E
XA
GG
ER
ATIO
N X
140
800
550
600
650
700
750
500
450
400
350
175
200
225
125
100
150
MET
ER
S
E'
FEET
E
AF'
G'
H'
I'
A'
B'
C'
D'
E'I
H
G
F
E
D
C
B
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