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Bettis, E Arthur, III

English

Iowa Research Online

12
3
4
P
Dcv
13
15
12
10
9
8
7
Cross-section Key 
Holocene 
DeForest Formation;  fine-grained alluvium
   
DeForest Formation, Corrington Member;  alluvial fan and colluvial slope 
deposits 
DeForest Formation;  peat, muck, organic-rich clay and silt 
DeForest and Henry formations; sand and gravel, channel deposits 
Late Wisconsinan 
Henry Formation, Sabula and Muscatine members; sand and pebbly sand, 
valley-train outwash  
Henry Formation;  gravel, valley-train outwash  
Equality Formation, Plum River Member;  fine-grained slackwater 
deposits 
Peoria Loess and Roxana Silt;  wind-blown silt and sand 
Illinoian   
Pearl Formation;  glacial outwash 
Glasford Formation, Kellerville Member;  glacial till   
Pre-Illinoian 
Wolf Creek and Alburnett formations;  glacial tills, associated sand, gravel 
and silts with limited distribution, and buried soils   
Pennsylvanian 
Caseyville, Abbott, and Spoon formations; shale, coal, mudstone and 
sandstone 
Devonian 
Cedar Valley Group; carbonate rocks
SURFICIAL GEOLOGIC MATERIALS 
OF THE BLANCHARD ISLAND QUADRANGLE, ILLINOIS - IOWA 
A A"W - E section along
4,581,000 m N
Bl
an
ch
ar
d 
Ch
ut
e
550
650
400
feet
450
500
350
lev
ee
lev
ee
M
iss
iss
ip
pi
 R
ive
r
gr
av
el 
pi
t
sp
oi
l
gr
av
el 
pi
t
Co
pp
er
as
 C
re
ek
sp
oi
l
Bl
an
ch
ar
d 
Isl
an
d
Dcv
P
1
1
4
21
1 1
1
4 4
8
10 10
12
13
15
10
13
15
9
8
8
8
7
7
Dcv
B B"W - E section along
4,576,000 m N
Ba
ss
 Is
lan
d
550
750
400
feet
450
650
350
M
ain
 D
itc
h 
No
rth
lev
ee
M
iss
iss
ip
pi
 R
ive
r
lev
ee
P
1
1
4
1 21
8
8
7
8
8
7
13
10
15
10
13
lev
ee
M
iss
iss
ip
pi
 R
ive
r
Co
lem
an
 S
lo
ug
h
Bo
gu
s C
hu
te
lev
ee
650
550
450
350
feet
400
C C"W - E section along
4,569,000 m N
1 1
44
2
314
11
4
P
Dcv
11
8
7
8
7
7
7
8 8
140
200
meters
110
170
140
200
meters
110
170
170
230
meters
140
200
110
o41 15" 00"
o91 07" 30"
o41 22" 30"
o91 07" 30"
o91 00" 00" 
o41 15" 00"
o41 22" 30"
o91 00" 00" 
un
na
m
ed
 sl
ou
gh
0 1 2 miles
0 1 2 kilometers
SCALE
1:24,OOO
.5
.5
Geological Survey Bureau
Open File Map Series 94-1
Prepared by
E. Arthur Bettis III
Energy and Geological Resources Division
Geological Survey Bureau
November 1994
Supported by the U.S. Geological Survey, Department of the Interior,
under assistance Award No. 1434-93-A-1152.
Iowa Department of Natural Resources
Larry J. Wilson, Director
ACKNOWLEDGEMENTS
Over a century of geological research by various State and Federal agencies, and a host of 
private investigators is summarized on this map.  Recognized for direct contributions to the 
map's production:  M. J. Bounk, J. D. Giglierano, B. E. Hoyer, D. L. Koch, P. J. Lohmann, G. 
A. Ludvigson, D. J. Quade, and J. C. Prior of the IDNR-Geological Survey Bureau, the Iowa 
City office of the U.S. Geological Survey-Water Resources Division, Iowa-Illinois Gas and 
Electric Company, Iowa Department of Transportation, U. S. Department of Agriculture-Soil 
Conservation Service, and landowners who granted access for field studies.
Description of Map Units
Holocene
Qdm8 ALLUVIUM, sand and loam, post-1930 (DeForest Formation, Camp Creek Member) over sand
 and pebbly sand of Henry Formation
Qdm7 ALLUVIUM, silt loam, clay loam, and sand mantled with 1.0 to 2.0 meters of Historic alluvium,
located channelward of artificial levee (DeForest Formation) over sand and pebbly sand of Henry
 Formation
    Qdm6 ALLUVIUM, silt loam, clay loam, and sandy loam with many small organic deposit inclusions, 
mantled with 0.5 to 2.0 meters of Historic alluvium, calcareous at depth (DeForest Formation)
 over sand and pebbly sand of Henry Formation 
    Qdm5       ALLUVIUM, silt loam, clay loam, and sand with organic deposit inclusions, mantled with 0.5 to
 1.0 meters of Historic alluvium, calcareous at depth (DeForest Formation) over sand and pebbly
 sand of Henry Formation
    Qdm4       ALLUVIUM, silt loam, clay loam, organic-rich loam, and sand, mantled with less than 0.5
 meters of Historic alluvium, calcareous at depth (DeForest Formation) over sand and pebbly sand
 of Henry Formation
    Qdm3       ALLUVIUM, silt loam, clay loam and organic-rich clay loam, noncalcareous and two to four
 meters thick (DeForest Formation) over sand and pebbly sand of Henry Formation
    Qdm2       ALLUVIUM, silt loam, clay loam, and sandy loam with thin reddish brown silty clay beds at
 base, noncalcareous and one to two meters thick (DeForest Formation) over sand and pebbly sand
 of Henry Formation
    Qdm1      ALLUVIUM, silt loam and clay loam with 0.1 to 0.3 meter-thick zone of reddish brown silty clay
 laminae at base, noncalcareous and two to four meters thick (DeForest Formation) over sand and 
pebbly sand of Henry Formation
    Qds          ALLUVIUM, sandy loam, loam and silt loam natural levee and crevasse splay deposits,
 calcareous at depth and one to five meters thick (DeForest Formation) over deposits of map units
 Qdm3 and Qdm4 and sand and pebbly sand of Henry Formation
Qdc1       ALLUVIUM, sandy loam and pebbly sand alluvial fan deposits, two to eleven meters thick
 (DeForest Formation, Corrington Member) over older Holocene alluvium
Qdc2      ALLUVIUM AND COLLUVIUM, loam and pebbly loam alluvial fan and colluvial slope
 deposits, two to eleven meters thick  (DeForest Formation, Corrington Member) over older
 Holocene alluvium
Qdy       ALLUVIUM, silt loam, clay loam, sandy loam, and organic-rich deposits in meander belts of
 anabranch channels (DeForest Formation) over sand and pebbly sand of Henry Formation
Qdw       LAKE AND MARSH DEPOSITS, peat, muck and other organic-rich lacustrine and paludal
 deposits in abandoned Mississippi River channels (DeForest Formation) over sand and pebbly
 sand of Henry Formation
Qdhn       ALLUVIUM, up to three meter thick loam and sandy loam alluvium (DeForest Formation) over
 sand and pebbly sand of Henry Formation
Late Wisconsinan
Qps       LOESS, silt loam with interbedded eolian sand (Peoria Loess), buries Sangamon Soil developed
 in till or erosion surface on till
Qpr       LOESS, silt loam with interbedded eolian sand (Peoria Loess), buries Farmdale Soil developed in
 Roxana Silt and Sangamon Soil developed in sandy and gravelly outwash of the Pearl Formation
Qe                   SLACKWATER DEPOSITS, laminated to thinly bedded silt, reddish brown silty clay, and fine to
 medium sand, Savanna Terrace in Mississippi Valley tributaries (Equality Formation, Plum River
 Member) 
Qhs OUTWASH SAND AND PEBBLY SAND, coarse to fine sand and pebbly sand mantled with up
 to 5.0 meters of eolian sand, Savanna Terrace complex in Mississippi Valley (Henry Formation,
 Sabula Member)
Qhm1 OUTWASH SAND AND PEBBLY SAND, coarse to fine sand and pebbly sand mantled with up 
to 1.5 meters of eolian sand, Kingston Terrace complex in Mississippi Valley (Henry Formation,
 Muscatine Member)
Qhm2 OUTWASH SAND AND PEBBLY SAND, coarse to fine sand and pebbly sand with thin gravel
 lenses within two meters of modern surface, mantled with thin sand sheet, Kingston Terrace
 complex in Mississippi Valley (Henry Formation, Muscatine Member)
Complex (Holocene and Pleistocene)
Qgwa ALLUVIUM, LOESS, SAND, GLACIAL TILL (DeForest, Glasford, Pearl, Wolf Creek, and
 Alburnett formations, Peoria Loess, and undifferentiated Pennsylvanian rocks)
Pennsylvanian
Pu LITHIFIED SHALLOW MARINE AND FLUVIAL DEPOSITS (Caseyville, Abbott and Spoon
 formations)
Other Map Units
ml Made land
pits Gravel pits in map units Qhm1 and Qhm2
    
   
 
Qdc1
Qdc2
Q
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Qdc2
Q
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Qds
Qdc1
Qdc2
Qdhn
Qhs
Q
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1
pits
Qdm3
Qdc2
Qdm8
Q
dm
7
Q
dm
7
Q
dm
7
Qhm1
Qdc2
Qdw
Qhm1
Qgwa
Q
dm
7
C
Qdm1
Qdm7
Qdy
Qhm1
Qdm8
Q
dm
7
Qdm6
Q
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7
Qps
C'
Q
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7
Q
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7
Qps
Qhm1
Qhm2
A
A'
Qdm8
Q
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Qdm6
Qdm5
Qdm4
Qdhn
Qdhn
Qhm1
Qgwa
Qdc1
Qgwa
Qps
Qhs
Qps
Qdhn
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Bl
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C
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ml
ml
pits
pits
Qps
Qdm3
Qdm2
Qhm1
Qdm2
Qps
Qhs
Qdm2
Qps
Qdm6
Qhm2
Qps
Qgwa
B'
B
Qdm8
Qdm8
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Q
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Qdhn
Qps
Qgwa
Qdhn
Qps
Qdhn
Qps
Qps
Qgwa
Qdhn
Qe
Qhm1
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Qdhn
Qps
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1
Qps
Qhs
Qpr
Qe
Pu
Qps
Qgwa
Qpr
Qe Qpr
Qgwa
Qgwa
Qhm1
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7
Q
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Qps
Qps
Qps
Qpr
Qpr


Surficial geologic materials of the Blanchard Island Quadrangle, Illinois-Iowa

https://ir.uiowa.edu/cgi/viewcontent.cgi?article=1003&amp;context=igs_ofm

Surficial geologic materials of the Blanchard Island Quadrangle, Illinois-Iowa

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