https://ir.uiowa.edu/igs_ofm/1005/thumbnail.jp

Bettis, E Arthur, III

Bunker, Bill J

Giglierano, James D

Howes, Mary R

Ludvigson, Greg A

Slaughter, Maureen K

Whitsett, T Michael

English

Iowa Research Online

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0 1 2 Miles
0 1 2 Kilometers
N
A
B
C D
91  37’ 30"
42  00’ 00"o
o
91  45’ 00"
42  00’ 00"
o
o
41  52’ 00"
91  45’ 00"
41  52’ 30"
91  37’ 30"
o
o
Scale
1:24000
SURFICIAL GEOLOGIC MATERIALS 
OF THE CEDAR RAPIDS SOUTH QUADRANGLE
LEGEND
Description of Map Units
Unit Description
Holocene
Qds ALLUVIUM (DeForest Formation) -- One to three meters of massive to weakly stratified, grayish brown to
brown loam, silt loam, clay loam, or loamy sand overlying less than three meters of poorly to moderately well
sorted, massive to moderately well stratified, coarse to fine feldspathic quartz sand, pebbly sand, and gravel.
Unit also includes colluvial deposits derived from adjacent map units.  Seasonally high water tables occur in
this map unit.
Qdl ALLUVIUM (DeForest Formation) -- Two to four meters of massive to moderately well stratified loam, silt loam,
clay loam, or loamy sand overlying more than three meters of poorly to moderately well sorted, massive to well
stratified, coarse to fine feldspathic pebbly sand and gravel of the Noah Creek Formation.  Seasonally high
water tables occur in this map unit.
Qdb MUCK AND PEAT (DeForest Formation, Woden Member) -- One to six meters of black to brown muck, peat,
and other organic-rich deposits in fens.  Massive to well stratified at depth.  Overlies sand and gravel and/or
massive, fractured, loamy glacial till of the Wolf Creek or Alburnett formations.  High water tables occur in
this map unit.
W WATER
Anthropogenic Units
Qq QUARRIES AND PITS -- Limestone quarries and sand and gravel pits.  Extent as of 1990 shown.
Qf FILL -- Areas of major land filling.  Fill associated with railroad grades, highway grades, and land leveling.
Variable in character ranging from loamy and sandy to concrete rubble.
Qi CUT AND FILL -- Areas of cut and fill associated with Interstate-380, Westdale Mall, and the Cedar Rapids
Municipal Airport.  Deposits within this map unit are similar to those in adjacent map units but may have
significant mantles of fill or deep cuts that expose underlying deposits.  Similar, but less extensive deposits 
occur along all roads.
Dpr FRACTURED CARBONATE BEDROCK (Pinicon Ridge Formation) -- Zero to twenty meters of unfossiliferous 
limestone, dolostone, and shale.  The basal shaley five meters are a confining unit that retards groundwater
infiltration.  The upper part of the unit is prone to karst development.
Dob FRACTURED CARBONATE BEDROCK (Otis and Bertram Formations, undifferentiated) -- Zero to forty
meters of unfossiliferous to poorly fossiliferous dolostone and limestone.
Devonian System
Dcv FRACTURED CARBONATE BEDROCK (Cedar Valley Group) -- Zero to forty meters of fossiliferous limestone
and dolostones used as a shallow bedrock aquifer.
Late Wisconsinan
Qpt LOESS AND INTERCALATED EOLIAN SAND (Peoria Formation) -Two to seven meters of yellowish brown to
gray, massive, jointed, calcareous or noncalcareous, silt loam and intercalated fine to medium, well sorted,
feldspathic quartz sand.  Grades downward to poorly to moderately well sorted, moderately to well stratified,
coarse to fine feldspathic quartz sand, pebbly sand, loam, or silt loam alluvium, or in some places the eolian 
sediments bury a clayey Farmdale/Sangamon Soil developed in Pre-Wisconsinan alluvium.  These alluvial fills
are beneath the Late Phase High Terrace (no paleosol beneath the loess) and Early Phase High Terrace
(paleosol beneath the loess) of the Iowa/Cedar Basin.
Qps1 LOESS AND INTERCALATED EOLIAN SAND (Peoria Formation) - Five to ten meters of yellowish brown to
gray, massive, jointed, noncalcareous grading downward to calcareous silt loam and intercalated fine to
medium, well sorted, feldspathic quartz sand.  Sand is most abundant in the lower part of the eolian package. 
Overlies massive, jointed, loamy glacial till of the Wolf Creek or Alburnett formations with or without intervening
clayey Farmdale/Sangamon Paleosol.  Loess and sand are dominantly Cedar Valley source.
Qps2 EOLIAN SAND (Peoria Formation - sand facies) -- Five to fifteen meters of yellowish brown to gray, moderately
to well stratified noncalcareous or calcareous, fine to medium, well sorted, feldspathic quartz sand.  May contain
interbeds of yellowish brown to gray, massive, silt loam loess.  Overlies eroded, massive, jointed, loamy glacial
till or fractured Devonian-age carbonate bedrock.  Dominantly Cedar Valley source.
Qps3 LOESS SHALLOW TO GLACIAL TILL (Peoria Formation) -- Two to three meters of yellowish brown, massive,
noncalcareous silt loam and intercalated fine to medium, well sorted, feldspathic quartz sand.  Sand, if present,
occurs in lower part of unit.  Overlies 0.5 to 1.5 meters of pebbly loam erosion surface sediment which, in turn,
overlies eroded, massive, jointed, firm, loamy glacial till of the Wolf Creek or Alburnett formations.  Seasonally
high water tables may occur in this map unit.
Qps4 LOESS SHALLOW TO SAND AND GRAVEL (Peoria Formation) -- One to two meters of yellowish brown,
massive, noncalcareous silt loam.  Overlies pebbly sand and gravel erosion surface sediment that is one to four
meters thick, which, in turn, overlies eroded, massive, jointed, firm, loamy glacial till of the Wolf Creek or Alburnett
formations, or fractured Devonian-age carbonate bedrock.  Seasonally high water tables may occur in this map unit.
Qps5 EOLIAN SAND SHALLOW TO GLACIAL TILL (Peoria Formation - sand facies) -- Two to four meters of yellowish
brown, massive to well stratified, noncalcareous, fine to medium, well sorted feldspathic quartz sand.  Overlies
pebbly loam erosion surface sediment which, in turn, overlies eroded, massive, jointed, firm, loamy glacial till of
the Wolf Creek or Alburnett formations
Qps6 EOLIAN SAND SHALLOW TO ROCK (Peoria Formation - sand facies) -- One to four meters of yellowish brown,
massive to well stratified, noncalcareous, fine to medium, well sorted feldspathic quartz sand.  May overlie one
to two meters of loamy erosion surface sediment and/or less than two meters of eroded, massive, jointed, firm
loamy glacial till of the Wolf Creek or Alburnett formations.  Fractured Devonian-age carbonate bedrock is less
than five meters below the land surface.
Qwa1 SAND AND GRAVEL SHALLOW TO TILL (Unnamed erosion surface sediment) -- One to three meters of
yellowish brown to gray, massive to weakly stratified, noncalcareous, medium to coarse, poorly sorted
feldspathic pebbly quartz sand with intercalated gravel and loam.  Overlies eroded, massive, jointed, firm, loamy
glacial till of the Wolf Creek or Alburnett formations.  Deposits in this mapping unit are derived primarily from
erosion of glacial till in the adjacent drainage basin.  Seasonally high water tables may occur in this map unit.
Qwa2 LOAMY AND SANDY SEDIMENT SHALLOW TO GLACIAL TILL (Unnamed erosion surface sediment) --
One to three meters of yellowish brown to gray, massive to weakly stratified, well to poorly sorted loamy, sandy
and silty erosion surface sediment.  Map unit includes some areas mantled with less than two meters of Peoria
Formation (loess and eolian sand).  Loess-mantled areas dominate the map unit in the southern part of the
Cedar Rapids South quadrangle.  Overlies eroded massive, jointed, firm glacial till of the Wolf Creek and 
Alburnett formations.  Seasonally high water tables may occur in this map unit.
Complexes
Qnw SAND AND GRAVEL (Noah Creek and Wolf Creek formations) -- More than three meters of yellowish brown
to gray, poorly to well sorted, massive to well stratified, coarse to fine feldspathic quartz sand, pebbly sand and
gravel.  In places mantled with one to three meters of fine to medium, well sorted feldspathic quartz sand
derived from wind reworking of the alluvium.  The unit encompasses deposits that accumulated primarily during
the late Wisconsinan.
Geological Survey Bureau
Open File Map Series 96-1
Prepared by
E. Arthur Bettis III
Greg A. Ludvigson
James D. Giglierano
Mary R. Howes
Bill J. Bunker
Maureen K. Slaughter
T. Michael Whitsett
Energy and Geological Survey Division
Geological Survey Bureau
September 1996
Supported by the U.S. Geological Survey, Department of Interior,
under assistance Award No. 1434-95-A-01362, and Bluestem Solid Waste Agency, City of
Cedar Rapids City Engineer, Linn County Regional Planning, Linn County Engineering, Wendling
Quarries Inc., Shive-Hattery Engineers and Architects Inc., and Howard R. Green Company.
Iowa Department of Natural Resources
Larry J. Wilson, Director
ACKNOWLEDGMENTS
Recognized for direct contributions to the map’s production:  D.L. Koch, R.R. Anderson,
B.J. Witzke, D.J. Quade, R.R. Rowden of the IDNR Geological Survey Bureau, R.D.
Mandel of Topeka, Kansas, Iowa City office of the U.S. Geological Survey - Water 
Resources Division, Iowa Department of Transportation, U.S. Department of Agriculture - 
Natural Resources Conservation Service, Linn County Engineering, Bluestem Solid Waste
Agency, Linn County Planning and Zoning, and landowners who granted access for field
studies.  Special thanks is extended to Rebecca Palmer, Director of Linn County Planning
and Zoning, for coordination with government agencies and private businesses in Linn
o
o
County.


Surficial geologic materials of the Cedar Rapids South Quadrangle

https://ir.uiowa.edu/cgi/viewcontent.cgi?article=1005&amp;context=igs_ofm

Surficial geologic materials of the Cedar Rapids South Quadrangle

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