https://ir.uiowa.edu/igs_ofm/1046/thumbnail.jp

Liu, H Paul

McKay, Robert

Tassier-Surine, Stephanie

Young, Jean

English

Iowa Research Online

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LEE
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TAMA
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SIOUX CLAY
IOWA
LYON
POLK
CASS
KOSSUTH
PAGE
JASPER
ADAIR
BENTON JONES
DAVIS
CLAYTON
STORY
FAYETTE
CEDAR
CLINTON
BOONE
PLYMOUTH
MONONA
DALLAS
MILLS
FLOYD
SHELBY
OBRIEN
HARDIN
WAYNE
BUTLER
WOODBURY WEBSTER
WRIGHT
MARION KEOKUK
TAYLOR
SCOTT
JACKSON
GREENE
HARRISON
UNION
GUTHRIE
LUCAS
WARREN
JOHNSON
HENRY
DUBUQUE
CRAWFORD CARROLL
MADISON
ADAMS
FRANKLIN
MAHASKA
CALHOUN GRUNDY
POTTAWATTAMIE
HANCOCK
LOUISA
HAMILTON
DECATUR
EMMET
ALLAMAKEEWINNESHIEK
CLARKE
WORTH
PALO ALTO
MARSHALL
HOWARD
FREMONT
DELAWARE
CHEROKEE BREMER
BUCHANAN
RINGGOLD
POWESHIEK
MONROE
MITCHELL
WAPELLO
BUENA VISTA
AUDUBON
BLACK HAWK
VAN BUREN
CHICKASAW
POCAHONTAS
WASHINGTON
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OSCEOLA
HUMBOLDT
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JEFFERSON
DICKINSON
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WINNEBAGO
CERRO GORDO
MONTGOMERY
Surficial Geology of the Bluffton (Iowa) 7.5' Quadrangle
±0 1 2 3 40.5 Miles0 1 2 3 40.5 Kilometers
1:24,000
Quadrangle Location
Base map from USGS Bluffton 7.5' Digital Raster Graphic (IGS GIS file DRGB39.TIF) which wasscanned from the Bluffton 7.5' Topographic Quadrangle map, published by US Geological Survey in 1981Topographic contours and land features based on 1975 aerial photography, field checked in 1977Land elevation contours (20' interval) based on NGVD 1929
Iowa Geological Survey digital cartographic file Blufftonquad06.mxd, version 6/28/06  (ArcGIS 9.0)Map projection and coordinate system based on Universal Transverse Mercator (UTM) Zone 15, datum NAD83
MABEL
DECORAH
HARMONY
BLUFFTON
RIDGEWAY
BURR_OAK
CRESCO_SE
CRESCO_NE
CANTON_MN
Adjacent 7.5' Quadrangles
GEOLOGIC MAPPING OF THE UPPER IOWA RIVER WATERSHED PHASE 2:  Bluffton 7.5’ Quadrangle  Iowa Geological Survey Open File Map OFM-06-5 July 2006  prepared by  Stephanie Tassier-Surine1, Robert McKay1, H. Paul Liu1, and Jean Young2  1Iowa Geological Survey, Iowa City, Iowa 2Luther College, Decorah, Iowa  
   Iowa Department of Natural Resources, Jeffrey R. Vonk, Director Iowa Geological Survey, Robert D. Libra, State Geologist   Supported in part by the U.S. Geological  Cooperative Agreement Number 05HQAG0086 National Cooperative Geologic Mapping Program (STATEMAP)      ACKNOWLEDGEMENTS  We thank Lora Friest and Adam Kiel of the Northeast Iowa RC & D for their efforts in helping to initiate this mapping project and for supporting our work in the Upper Iowa River watershed.   Luther College in Decorah actively participated in the project through subcontract 05-7380-01 for field mapping support.  Luther College student Jared Bendel was a participant in the field work to support the mapping effort.  Drilling in selected sites was provided under contract by Aquadrill, Inc. of Swisher, Iowa.  Thanks to Joe Artz of the Office of the State Archeologist, Iowa City, for time spent in the field examining Quaternary exposures and for providing drill records from that office.  Deborah Quade, Iowa Geological Survey (IGS) lent support with Quaternary field and office expertise, and Brian Witzke (IGS) provided valued information concerning the Ordovician stratigraphy of the area.  Digital cartography was provided by Jim Giglierano (IGS).  Thanks to Dave Stanley and staff at Bear Creek Archaeology in Cresco, Iowa, for providing reports and drilling records.  We thank Dave Ohlert of the Winneshiek County Engineers Office for securing bridge sounding logs.  Special thanks to the following landowners who graciously allowed access to their land for drilling:  Lloyd Gossman, Robert Snell, John Ryan, Delores Gerber and Mike Miller.    
LEGEND   Description of Map Units  Cenozoic  Quaternary System  Hudson Episode   Qal - Alluvium (De Forest Formation-Undifferentiated) One to four meters (3 to 13 ft) of massive to weakly stratified, grayish brown to brown loam, silt loam, clay loam, or loamy sand overlying less than three meters (10 ft) of poorly to moderately well sorted, massive to moderately well stratified, coarse to fine feldspathic quartz sand, pebbly sand, and gravel and more than three meters (10 ft) of pre-Wisconsin or late Wisconsin Noah Creek Formation sand and gravel. Also includes colluvium derived from adjacent map units in stream valleys, on hillslopes, and in closed depressions.  Seasonal high water table occurs in this map unit.    Qallt - Upper Iowa River Valley- Low Terrace/Modern Channel Belt (DeForest Formation-Camp Creek Member and Roberts Creek Member)  Variable thickness of less than 1 m to 5 m (3 to 16 ft) of very dark gray to brown, noncalcareous, stratified silty clay loam, loam, or clay loam, associated with the modern channel belt of the Upper Iowa River valley.  Ox-bow lakes and meander scars are common features associated with this terrace level.  Post-settlement alluvium thickness varies from 0.5 m (1.5 ft) in higher areas to 2 m (6.5 ft) along the river course and in lower lying areas.  Seasonal high water table and frequent flooding potential.    Qalit - Upper Iowa River Valley - Intermediate Terrace (DeForest Formation-Camp Creek Member, Roberts Member and Gunder Member)  Variable thickness of less than 1 m to 5 m (3 to 16 ft) of very dark gray to brown, noncalcareous, stratified silty clay loam to loam that overlies calcareous, medium- to coarse-grained sand and gravel of Wisconsinan (Noah Creek Formation) and/or pre-Wisconsinan age.  Occupies low terrace position.  Seasonal high water table and frequent flooding potential    Wisconsin Episode  Qpt - High Terrace - either Late Phase or Early Phase (Peoria Formation – silt and/or sand facies)  Two to seven meters (6.5 to 23 ft) of yellowish brown to gray, massive, jointed, calcareous or noncalcareous, silt loam and intercalated fine to medium, well sorted sand.    May grade downward to poorly to moderately well sorted, moderately to well stratified, coarse to fine feldspathic quartz sand, pebbly sand, loam, or silt loam alluvium (Late Phase) or may overlie a Farmdale Geosol developed in Roxanna Silt which in turn overlies a well-expressed Sangamon Geosol developed in poorly to moderately well sorted, moderately to well stratified, coarse to fine sand, loam, or silt loam alluvium (Early Phase).   Qps - Loess   (Peoria Formation— silt facies)  Generally 2 m to 8 m (6 to 27 ft) of yellowish to grayish brown, massive, jointed noncalcareous grading downward to calcareous silt loam to silty clay loam.  Overlies massive, fractured, loamy glacial till of the Pre-Illinoian Wolf Creek or Alburnett formations with or without intervening clayey Farmdale/Sangamon Geosol.  In most areas the Pre-Illinoian till is 1 m to 5 m (3 to 16 ft) thick, but may be up to 10 m (33 ft) thick locally.  This mapping unit encompasses upland divides, ridge-tops and convex-side slopes.  Well to somewhat poorly drained landscape.  Qpsr - Loess over Bedrock  (Peoria Formation— silt facies)  Generally 2 to 8 m (6 to 27 ft) of yellowish to grayish brown, massive, jointed noncalcareous grading downward to calcareous silt loam to silty clay loam.  Overlies Ordovician bedrock units or colluvium.  This mapping unit encompasses upland divides, ridge-tops and convex side-slopes.  Well to somewhat poorly drained landscape.  Qwa2 - Loamy and Sandy Sediment Shallow to Glacial Till (sediment associated with erosion surface)  One to three meters (3 to 10 ft) 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 (6.5 ft) of Peoria Formation-silt facies (loess). Overlies massive, fractured, firm glacial till of the Wolf Creek and/or Alburnett formations. Seasonally high water table may occur in this map unit.    Pleistocene Undifferentiated  Qrc - Rock Core Meanders/Structural Benches – Includes rock core meanders associated with Pre-Wisconsin river development and terrace deposits overlying bedrock benches.  Some areas occupy positions as much as 10 m (33 ft) above the modern floodplain.  Consists of undifferentiated alluvial and colluvial fill of unknown age and thickness.  May be mantled by 1 to 3 m (3 to10 ft) of Peoria Formation-silt facies (loess).    Paleozoic  Ordovician System  Om - Shale, Limestone, and Dolostone (Maquoketa Formation.)  A nonresistant slope-forming unit of up to 20 m (65 ft) of interbedded argillaceous limestone, dolostone and grey and brown shale.  Fragmentary trilobite fossils are common in the basal Elgin Limestone Member.  Forms a confining unit that bounds a karst system in underlying Wise Lake and Dunleith formations, and may host sinkholes in its lower portion.    Owd - Limestone and minor Shale  (Wise Lake and overlying Dubuque formation)  A prominent ledge and cliff-forming unit of up to 31 m (102 ft) of limestone with notable thin interbedded shale in the upper 6 m (20 ft).  This map unit is the upper of two successive major cavern and karst-forming bedrock units in the area.  The Wise Lake Formation consists of 21 m (67 ft) of massive limestone portions of which exhibit a distinctive bioturbated fabric.  The Dubuque Formation consists of 10 m (34 ft) of  crinoidal limestones and thin interbedded shale.  Sinkholes are common to abundant within this map unit.  Often mantled by 0 m to 2 m (0 to 6 ft) of loess-derived and weathered bedrock-derived colluvium.  Od - Limestone  (Dunleith Formation)  A prominent ledge and cliff-forming unit of up to 42 m (137 ft) of limestone with minor thin interbedded shale.  This is the lower of two successive major cavern and karst-forming bedrock units in the area.   The formation consists of fossiliferous limestone and argillaceous limestone with common chert nodules.  Major springs occur near the base and sinkholes and karst features are common.   Frequently mantled by 0 m to 2 m (0 to 6 ft) of loess-derived and weathered bedrock-derived colluvium.  Odpg - Shale, Limestone, and Dolomite  (Decorah, and underlying Platteville and Glenwood formations)  A nonresistant slope-forming unit of green-grey shales, dense limestones, argillaceous limestones, and dolostone with average thickness of 26 m to 27 m (85 to 90 ft).  Large detached slump-blocks of overlying Dunleith Formation limestone often rest on the upper surface of this unit.  Forms a regional confining unit that serves as the basal boundary of  the karst system in the overlying Dunleith, Wise Lake and Dubuque formations.  The upper division, the Decorah Formation, consists of 12 m to 14 m (39 to 46 ft) of green-grey fossiliferous shales with minor interbedded limestones.  The middle division, the Platteville Formation, consists of 7.5 m (25 ft) of limestone, argillaceous limestone, and dolostone.  The lower division, the Glenwood Formation, consists of 2 m to 3 m (7 to 9 ft) of green-grey shale with minor siltstone to fine sandstone.  This map unit, especially the Decorah and Glenwood subdivisions, is rarely exposed and almost everywhere is mantled by 0 m to 2 m (0 to 6 ft) of loess-derived and weathered bedrock-derived colluvium.    Qpq - Pits and Quarries   Sand and gravel pits and rock quarries.    Water Features     
Drill Holes
D Outcrops


Surficial Geology of the Bluffton (Iowa) 7.5\u27\u27 Quadrangle,

https://ir.uiowa.edu/cgi/viewcontent.cgi?article=1046&amp;context=igs_ofm

Surficial Geology of the Bluffton (Iowa) 7.5\u27\u27 Quadrangle,

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