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BEDROCK GEOLOGY of FOLEY QUADRANGLE Institute of Natural Resource Sustainability William W

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BEDROCK GEOLOGY of FOLEY QUADRANGLE Institute of Natural Resource Sustainability William W BEDROCK GEOLOGY OF FOLEY QUADRANGLE Institute of Natural Resource Sustainability William W. Shilts, Executive Director CALHOUN COUNTY, ILLINOIS STATEMAP Foley-BG ILLINOIS STATE GEOLOGICAL SURVEY E. Donald McKay III, Director Joseph A. Devera 2010 Qal Om S Mch Mch Dcv Qal 625 Mbk Qal e" Mch S Mch Q(f) Qal Mch S Om Dcv EXPLANATION Qal Mch Mbk Qal S Qal Alluvium S 485e" Mch Quaternary Holocene Q(f) Fan deposits Mch Qal Mbk Mch Tertiary Tg Grover gravel Plio-Pleistocene Qal Unconformity Om Burlington and Keokuk Mbk Valmeyeran Qal Mch Limestones Q(f) Mbk Mississippian Qal Unconformity S Chouteau and Hannibal Mch Kinderhookian Qal Mch 761 Formations Dcv ª Unconformity Mch Devonian Middle Devonian Mch Dcv Cedar Valley Limestone Unconformity Silurian Silurian S Silurian Formations Mch Qal Om Dcv Unconformity Mch Cincinnatian Om Maquoketa Shale Qal Q(f) Unconformity Mch Ordovician Ok Kimmswick Limestone Tg Mch Mohawkian Qal Plattin and Decorah Mbk Opd Qal Limestones S Qal Mch Dcv Mch 510 Om ª Ok Mbk Symbols Strike and dip of bedding; number indicates 425 40 e" degree of dip 725 ªª716 Mch Horizontal bedding Mch Dcv Æ Abandoned quarry Qal Ok Qal Mch Outcrop of special note, shown where contact or map unit was well exposed at time of mapping Mch Qal Drill Holes Qal Opd from which subsurface data were obtained Numeric label indicates total depth of boring in feet. Mbk o Om S e" 425 2 Water-well boring o Mch Qal 3 ª510 Dry oil well Qal Om Dcv " Line Symbols e60 S dashed where inferred, dotted where concealed Ok Mch Tg Contact Om Line of cross section Dcv A AЈ Qal Mch 485 S e" 465e" Mch Om Note: Well and boring records are on file at the ISGS Geological e"125 Records Unit and are available online from the ISGS Web site. Qal S 485e" 480 485 e" e" e" 494 Dcv Mch S e" Dcv oÆ Opd 552 4 Tg AЈ Mbk Ok Mch Mch Qal S S Qal Tg Om Dcv Om e Qal o2 Mch S Mbk Om Ok So Mch 2 Mch o Om 6 e" 385 Om Qal Æ Opd o Mch 3 A Opd Mch Mbk Base map compiled by Illinois State Geological Survey from digital data (Raster Feature SCALE 1:24,000 Geology based on field work by Joseph A. Devera, 2009–2010. Separates) provided by the United States Geological Survey. Compiled by photogrammet- 1 1/ 2 0 1 MILE ric methods from imagery dated 1974. Field checked 1975. Revised from imagery dated Digital cartography by Jane E.J. Domier and Dawn V. Heckmann, Illinois State Geological 1000 0 1000 2000 3000 4000 5000 6000 7000 FEET 1993 PLSS and survey control current as of 1975. Map edited 1996. Survey. 1 .5 0 1 KILOMETER North American Datum of 1983 (NAD 83) This research was supported in part by the U.S. Geological Survey National Cooperative Projection: Transverse Mercator Geologic Mapping Program (STATEMAP) under USGS award number G09AC00197. The 10,000-foot ticks: Illinois State Plane Coordinate system, west zone (Transverse Mercator) views and conclusions contained in this document are those of the authors and should not 1,000-meter ticks: Universal Transverse Mercator grid system, zone 15 BASE MAP CONTOUR INTERVAL 5 and 10 FEET be interpreted as necessarily representing the official policies, either expressed or implied, NATIONAL GEODETIC VERTICAL DATUM OF 1929 of the U.S. Government. Recommended citation: This map has not undergone the formal Illinois Geologic Quadrangle map review pro- Devera, J.A., 2010, Bedrock Geology of Foley Quadrangle, Calhoun County, Illinois: Illinois cess. Whether or when this map will be formally reviewed and published depends on the State Geological Survey, USGS-STATEMAP contract report, 2 sheets, 1:24,000. © 2010 University of Illinois Board of Trustees. All rights reserved. resources and priorities of the ISGS. For permission information, contact the Illinois State Geological Survey. The Illinois State Geological Survey and the University of Illinois make no guarantee, expressed or implied, regarding the correctness of the interpretations presented in this document and accept no liability for the consequences of decisions made by others on the basis of the information presented here. The geologic interpretations are based on data that may vary with respect to accuracy of geographic location, the type and quantity of data available at each location, and the scientific and technical qualifications of the data sources. Maps or cross sections in this document are not meant to be enlarged. 1 /2 ° ROAD CLASSIFICATION ADJOINING 1 2 3 QUADRANGLES 1 Elsberry, MO TH Primary highway, Light-duty road, hard or 2 Hamburg TH hard surface improved surface 3 Hardin 4 5 Secondary highway, 4 Luckett Ridge, MO UE NOR hard surface Unimproved road For more information contact: 5 Nutwood GNETIC NOR TR Institute of Natural Resource Sustainability 6 Maryknoll, MO MA Illinois State Geological Survey 6 7 8 7 Winfield 615 East Peabody Drive 8 Brussels APPROXIMATE MEAN State Route Champaign, Illinois 61820-6964 DECLINATION, 2010 (217) 244-2414 http://www.isgs.illinois.edu STATEMAP Foley-BG Sheet 1 of 2 Introduction The Decorah Limestone (Middle Ordovician) ranges from five to ten feet A shale break above the Devonian denotes the Hannibal Shale (Lower thick. It has similar bedding characteristics as the Plattin, i.e. wavey with Mississippian) and can be seen on the map as a shelf in the southern and The Foley Quadrangle is located about twenty miles north of St. Louis, thin shale interbeds. The difference being the Decorah is a dense, choco- northern part of the study area. The shale is greenish-gray, non-resistant Missouri in Calhoun County Illinois. This quadrangle is driftless but man- late brown, lime mudstone that weathers to a creamy yellow-white. The and soft. In the central part of the outcrop area the Hannibal is protected tled in loess. Most of the drainages flow west of the Dividing Ridge to the shale is also brown and calcareous. The Decorah was too thin to map on a by the resistant, siliceous, Chouteau Limestone and forms steep slopes. Mississippi River. These drainages provide some of the natural bedrock 1:24,000 scale so it was combined with the Plattin on the map as Odrovi- Both the Hannibal and Chouteau are conformable and they are both Kin- exposures. The Mississippi River yields the bluff exposures. The oldest cian, Decorah/Plattin (Odp). This unit is unconformable with the overlying derhookian. rock exposed is the Plattin Limestone (Middle Ordovician). It occurs on Kimmswick Limestone. the Mississippi River bluff in the southern portion of the quadrangle. The The Burlington-Keokuk Limestones (Middle Mississippian) unconform- youngest bedrock unit mapped in the study area is the Burlington-Keokuk The Kimmswick Limestone (Middle Ordovician) is an exceptionally pure ably overlies the Chouteau Limestone. This is a calcium-rich limestone Limestone which occurs all along the east border of the map along the crystalline limestone that outcrops along the river bluffs above the Odp that forms steep outcrops in the upper parts of the bluffs along the Divid- Dividing Ridge. The Grover Gravel is a younger Tertiary (Neogene) unit and in the creeks in the southern portion of the quadrangle. The Kimms- ing Ridge. It is a white to light gray crinoidal grainstone that contains was also mapped but could hardly be called a bedrock unit because it is wick is well exposed in Dixon Hollow in Sec.5, T12S, R2W. It is a dense chert nodules in the lower part of the unit. It is overlain locally by either composed of unlithified gravel that intermittently caps the upland areas limestone due to large blocky calcite cement that forms around large Tertiary gravel (Grover Gravel) or loess. The siliceous nature in the lower above the Burlington-Keokuk Limestone. fragmental crinoid grains which yields greatly reduced porosity. This part of the rock makes this unit resistant to erosion. The upper part is calcite cement is called epitaxial cement which quickly “grows” during higher in calcium and where loess is thin karst features form. This is seen Geologic Setting early burial of the carbonate sediment. The dense nature of this unit makes in the northern portion of the Burlington-Keokuk outcrop belt. The Burl- it susceptible to jointing and karstification. The only pervasive karst in the ington-Keokuk belongs to the Valmeyran Series. The Foley Quadrangle is over one mile north of the Cap au Gres faulted Foley Quadrangle occurs in Secs. 8, 17 and 20 of T12S, R2W where the flexure. No major structures, i.e. faults and folds occur in this quadrangle. Kimmswick Limestone occurs below loess. The Kimmswick is uncon- Economic Geology Only a broad and subtle feature that would be equivalent to the north limb formable with the overlying Maquoketa Shale. of the Cap au Gres faulted flexure strikes northwest and dips northeast Oil and Gas in the southern quarter of the study area. Dips in the southern part of the The Maquoketa Shale (Upper Ordovician) is a nonresistant, one hundred No oil and gas has been produced from this quadrangle. Three oil and quadrangle range from six to four degrees east or north east. Regional dips foot thick unit. It makes a north-south valley east of the river bluff and gas wells were drilled in the quadrangle all were dry and abandoned. The into the Illinois Basin range from two to three degrees east or northeast. parallels both the river bluff and the Dividing Ridge. This shale is an aqua- main objective was the Kimmswick Limestone which is known to produce Rocks in this part of the basin are influenced by two major structures that tard, impervious to groundwater movement.
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