BEDROCK GEOLOGY of VALMEYER QUADRANGLE Institute of Natural Resource Sustainability William W
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BEDROCK GEOLOGY OF VALMEYER QUADRANGLE Institute of Natural Resource Sustainability William W. Shilts, Executive Director MONROE COUNTY, ILLINOIS Illinois Geologic Quadrangle Map ILLINOIS STATE GEOLOGICAL SURVEY IGQ Valmeyer-BG E. Donald McKay III, Interim Director F. Brett Denny, Russell J. Jacobson, and W. John Nelson 2009 " á Msm á á á Mbk Msm Ok " " Msl " Mw Mfg Odp Om Msm EXPLANATION Msl St. Louis Limestone " Msl " Msm Salem Limestone Ok Mfg Ok " Mississippian Mw Warsaw Formation Valmeyeran and Kinderhookian " " Burlington-Keokuk " Mbk Mbk Limestones " " " " " " " Fern Glen Formation Mfg " and Chouteau Limestone Sª700 Om Unconformity SG 540 Odp ª Hannibal Shale and Ok Om AЈ Maquoketa Formation 5 Cincinnatian Msl Unconformity Ok " Kimmswick Limestone Ordovician V " almey " " (crestal surf " Ok " M Decorah Formation and er Anticline Odp Mfg Plattin Limestone " Mohawkian " " " ace) " " Om " Msl " Odp Oj Joachim Dolomite " Ok " Odp " " " " " " " " " " " " M " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " Msm Mw " " " " " " " " " " Valmeyer " " " " " " " " " " " " " " " " " " " " " " " M " " " " " " " " " " " Symbols 710 e " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " " Strike and dip of bedding; number Ok " " " " " " " " " " " " " " 40 | " " " " " " " " G " " " | H " " " " " " " " " " " " " " " " " " " " " " " " Msm " indicates degree of dip " " " " " " " " " " Om " " " " " " " " " " " " " " " " " " " " " " " Om " " " " Ok G " " H N | " " Horizontal bedding J N " " J " " NJ " " Mbk " Vertical joints " Mfg " Æ e 750 Quarries 12 Msl Æ Abandoned quarry | G Mw | H G Drill Holes | Om H " from which subsurface data were obtained " Mfg " " " " Ok " " 15 S 565 " Dry oil and gas test hole " " " " " " " 13 " ª ª " " " " " " " " " " 20 " " e " " Other boring " | " " G " Msm | H G | SG 745 Boring with samples (S) or geophysical log (G). Msl H e Mbk Mw Numeric label indicates total depth of boring in feet. 15 Odp Msl " " 14 Mfg Mbk S 345 16 Line Symbols Om ª | 20 dashed where inferred, dotted where concealed G |H G | Msl H Contact 5 Mfg 15 Fault; ball and bar on downthrown side | Msl " G Msm 20 " |H H Anticline Mw 10 G H Msm | direction of plunge indicated by arrow Mbk H G Mfg 5 Æ G Syncline Æ Msl S 625 H | ª G 25 Monocline |H G á | Msl H V Msl almey Ј Line of cross section Msl (crestal surfer Anticline A A S 1642 Msm Ok ª Mbk | 18 20 ace) G Note: Well and boring records are on file at the ISGS Geological G | Mbk Records Unit and are available online from the ISGS Web site. |H H Mw Om Msl Msm G | | G Monroe City Synclin H |H (trough surf Mbk Mw Mfg G Msl 12 Mbk Odp Msl ace) | e Msl H 195 | Odp e G |H 8 Mbk 8 Mw A Msl | Msm G 8 |H Msm Æ Mw Msm Mw | G Msm |H Msl 14 Oj Mw Msm Msl Msl 4 Msl Msl Msl Base map compiled by Illinois State Geological Survey from digital data (Raster Feature SCALE 1:24,000 Geology based on field work by F. Brett Denny and Russel J. Jacobson, 2001–2002. Separates) provided by the United States Geological Survey. Compiled by photogrammetric 1 1/ 2 0 1 MILE methods from imagery dated 1986. Field checked 1989. Revised from imagery dated 1993. Digital cartography by Jane E.J. Domier, Steven M. Radil, and Alex J. Beata, Illinois State 1000 0 1000 2000 3000 4000 5000 6000 7000 FEET PLSS and survey control current as of 1989. Base map edited as of 1996. New Valmeyer Geological Survey. area compiled from digital orthophotos dated 2005. 1 .5 0 1 KILOMETER This research was supported in part by the U.S. Geological Survey National Cooperative North American Datum of 1983 (NAD 83) Geologic Mapping Program (STATEMAP) under USGS award number 01HQAG0103. The Projection: Transverse Mercator views and conclusions contained in this document are those of the authors and should not 10,000-foot ticks: Illinois State Plane Coordinate system, west zone (Transverse Mercator) BASE MAP CONTOUR INTERVAL 10 FEET be interpreted as necessarily representing the official policies, either expressed or implied, 1,000-meter ticks: Universal Transverse Mercator grid system, zone 15 NATIONAL GEODETIC VERTICAL DATUM OF 1929 of the U.S. Government. The Illinois State Geological Survey and the University of Illinois make no guarantee, Recommended citation: expressed or implied, regarding the correctness of the interpretations presented in this © 2009 University of Illinois Board of Trustees. All rights reserved. Denny, F.B., R.J. Jacobson, and W.J. Nelson, 2009, Bedrock Geology of Valmeyer Quadran- document and accept no liability for the consequences of decisions made by others on the gle, Monroe County, Illinois: Illinois State Geological Survey, Illinois Geologic Quad- For permission information, contact the Illinois State Geological Survey. basis of the information presented here. The geologic interpretations are based on data rangle Map, IGQ Valmeyer-BG, 2 sheets, 1:24,000. 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 ° ADJOINING ROAD CLASSIFICATION 1 2 3 QUADRANGLES 1 Maxville, MO TH TH Primary highway, Light-duty road, hard or 2 Oakville hard surface improved surface 3 Columbia 4 5 4 Herculaneum, MO Secondary highway, UE NOR hard surface Unimproved road GNETIC NOR For more information contact: 5 Waterloo TR Institute of Natural Resource Sustainability 6 Festus, MO MA Illinois State Geological Survey 6 7 8 7 Selma APPROXIMATE MEAN 615 East Peabody Drive 8 Renault DECLINATION, 2009 U.S. Route State Route Champaign, Illinois 61820-6964 (217) 244-2414 http://www.isgs.illinois.edu IGQ Valmeyer-BG Sheet 1 of 2 THICKNESS A St. Louis Limestone Limestone, dolostone, minor limestones and dolostones. The lower contact is poorly dominantly white to gray, coarse-grained, cross-bedded FORMATION GRAPHIC COLUMN (feet) UNIT siltstone, and shale. Light gray to medium gray dense exposed, but appears to be sharp and conformable. crinoidal grainstone. It emits a faint petroliferous odor SERIES SYSTEM lime-mudstone and fossil wackestone are prevalent. when cracked. Fossils include the problematic, sunflow- Some beds contain quartz sand and breccia of sub- D Burlington-Keokuk Limestones Cherty lime- er-like alga(?) Receptaculites sp.; the trilobites Illaenus angular limestone clasts. Oolitic grainstone, greenish stone, minor siltstone, and shale. The dominant lithol- sp. and Isotelus gigas; brachiopods; and gastropods. St. Louis oncolitic packstone, peloidal grainstone, stromatolitic ogy is white to light gray crinoidal grainstones with Fossils are commonly broken. Bedding is generally 75–100 Limestone A boundstone, carbonate intraclastic conglomerates, and abundant nodules and bands of light gray to black chert thick to massive. Shale occurs as uncommon partings yellow-weathering dolostone beds add to the mix of that weather white. Chert comprises at least 25 percent and thin interbeds; the shale is calcareous and may lithofacies. Gray to dark gray chert occurs as nodules of the lowermost beds. Alternating with grainstone are contain pyrite. Chert is uncommon; it is white to light and stringers throughout the formation. Siltstone and thinner beds of argillaceous to sandy, cross-bedded yellowish gray and occurs chiefly near the base of the shale occur as thin interbeds; the siltstone is calcare- limestone that weather to light brown. Large spiriferid unit. The basal contact is a distinct hardground omis- ous and greenish gray; the shale is greenish gray and brachiopods are common along with crinoids, bryozo- sion surface. Salem 120–190 reddish brown, calcareous, soft, and non-fissile.Acro - ans, and corals. Thin interbeds of dark gray to green- Limestone B cyathus floriformis, a colonial coral, occurs in the lower ish gray, calcareous shale and siltstone are present. J Decorah Formation Limestone and shale. Light MERAMECIAN part of this formation; the “finger coral” Acrocyathus Originally described in southeastern Iowa as separate brownish to greenish gray, very fine to coarse granu- proliferus is widespread near the base. The contact with formations, the Burlington and Keokuk Limestones can- lar and micritic limestone is argillaceous and silty and the Salem Limestone is gradational. In this study, the not be differentiated in the map area. The lower contact contains thin interbeds of organic-rich reddish brown contact was placed about 20 feet below the lower Ac- is gradational. shales. Dark gray chert nodules are present. Some Warsaw 75–110 rocyathus floriformis zone. Locally, an erosional karstic beds are highly fossiliferous; strophomenid brachiopods Formation C surface was observed near the contact; however, as E Fern Glen Formation Limestone, siltstone, and are most abundant. This unit is exposed at the crest ALMEYERAN Lineback (1972) and Lasemi and Norby (2000) showed, shale. Limestone is red to greenish gray, thin-bedded, of the anticline on the bluff just north of the Valmeyer V MISSISSIPPIAN the St. Louis-Salem contact is time-transgressive, be- and argillaceous; it contains small calcite geodes and Quarry. The base is not exposed. coming younger to the north in this area. nodules of greenish gray, fossiliferous chert. Crinoid stems are the only common fossils. Green and red K Plattin Limestone Limestone