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Quadrangle Map Sheet Template BEDROCK GEOLOGY OF ELSAH QUADRANGLE Illinois Department of Natural Resources Illinois Geologic Quadrangle Map ILLINOIS STATE GEOLOGICAL SURVEY JERSEY AND MADISON COUNTIES, ILLINOIS IGQ Elsah-BG William W. Shilts, Chief F. Brett Denny and Joseph A. Devera 2008 A� 109 R 11 W R 10 W T 7 N 650 T 6 N 3 e 3 220 Ms e" 600 e" 60 e 265 0 e 400 W 600 Ms 600 Mw W 600 6 5 e6"50 450 11 198 Ms 3 550 R e"305 R 10 Msl Mw 500 e 167 Ms 450 650 6506 5 4 600 3 e" 2 1 278 500 600 550 650 Ms 550 500 Ms e"300 550 600 Qce Qce 600 7 8 600 650 Ä 450 Qce o Ms 500 o2 2 600 600 550 600 600 600 450 3 550 550 o 500 650 Mw 550 500 Mw 550 500 600 650 550 o 450 10 e" 285 600 0 7 8 9 11 12 50 4 550 650 280 600 e" e" Ms 255 600 550 500 Msl 550 550 EXPLANATION e 600 Mw e" 265 265 o 500 650 Mbk e" 2 Msl 18 17 550 Qce 600 500 450 600 500 Holocene and 550 Quaternary Qce Cahokia-Equality Formation 320 Pleistocene e" 550 Ms undifferentiated Mw 3 Qce 405e" o 2 600 Msl 550 Msl St. Louis Limestone 550 Mw 4 500 550 o o 500 500 550 Mbk 2 450 T 6 N 550 450 450 18 17 Mbk 16 450 15 Ms e" 14 13 450 Salem Limestone 67 125 o e" 550 e" Ms Mbk 550 3 205 Mississippian Valmeyeran 500 600 385 500 500 600 305 500 e" o e" 450 650 Ms 450 500 Mw 3 450 Warsaw Formation 500 Mw e o 500 550 19 20 27 600 500 500 3 500 Qce e" o e C 550 Mw 100 550 2 Mbk 500 Burlington-Keokuk 3 Mbk 550 A 105 550 Limestones 19 450 e e" 600 600 500 Qce Mbk 280 e" 500 Qce 500 550 20 450 e"280 240 450 e" 385 450 450 600 210 e" e" 500 35 21 Mw 600 e" 35 e" 22 o 3 550 23450 Qce 550 24 o 500 385 Msl 550 600 500 e" 650 e" 3 257 e" 345 550 Mbk Msl 600 650 600 Ms 550 Symbols 71 o e" 500 700 Mw 4 W W Ms 30 29 Strike and dip of bedding; number indicates degree of dip 450 T 48 N Qce 600 3 550 650 11 450 550 3 R Mw R 10 Horizontal bedding 600 700 450 28 600 Mbk Mw 500 700 Ms 69 Vertical joints 450 e" o 27 600 650 25 4 Outcrop of special note, shown where unit 26 600 550 Ä 450 or contact was well exposed during mapping 550 500 Ä 600 100 550 Æ Æ Abandoned quarry Ms 450 o 31 420 600 4 600 Drill Holes Qce 32 500 T 6 N from which subsurface data were obtained "e 100 500 Water-well boring Qce "e Engineering boring e Other boring 17 CSG e 620 Labels indicate samples (S), geophysical log (G), or core (C). Numeric label indicates total depth of boring in feet. Line Symbols dashed where inferred J 420 Contact 18 17 Elevation of top of Burlington-Keokuk 250 Limestones; contour interval 50 feet 94 19 A A� Line of cross section 20 Note: Well and boring records are on file at the ISGS Geological Records 94 Unit and are available online from the ISGS Web site. H T 48 N 20 430 420 430 94 22 22 21 410 430 23 440 440 420 430 420 33 H R 6 E Base map compiled by Illinois State Geological Survey from digital data provided by the SCALE 1:24,000 Geology based on field work by F.B. Denny, 2000–2001. United States Geological Survey. Compiled from imagery dated 1952. Topography and 1 1/ 2 0 1 MILE planimetry revisions from imagery dated 1991. Digital cartography by J. Domier, L. Verhelst, A. Schultz, and S. Radil, Illinois State Geo- 1000 0 1000 2000 3000 4000 5000 6000 7000 FEET logical Survey. North American Datum of 1983 (NAD 83) 1 .5 0 1 KILOMETER Projection: Transverse Mercator This research was supported in part by the U.S. Geological Survey, National Cooperative 10,000-foot ticks: Illinois State Plane Coordinate system, east zone (Transverse Mercator) Geologic Mapping Program (STATEMAP) under USGS award number HQ97AG01820. 1,000-meter ticks: Universal Transverse Mercator grid system, zone 15 The views and conclusions contained in this document are those of the authors and BASE MAP CONTOUR INTERVAL 10 FEET should not be interpreted as necessarily representing the official policies, either expressed NATIONAL GEODETIC VERTICAL DATUM OF 1929 or implied, of the U.S. Government. Recommended citation: Denny, F.B. and J.A. Devera, 2008, Bedrock Geology of Elsah Quadrangle, Jersey and The Illinois State Geological Survey, the Illinois Department of Natural Resources, and the Madison Counties, Illinois: Illinois State Geological Survey, Illinois Geologic Quadran- Released by the authority of the State of Illinois: 2008 State of Illinois make no guarantee, expressed or implied, regarding the correctness of the gle Map, IGQ Elsah-BG, 2 sheets, 1:24,000. 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 123 QUADRANGLES 1 Otterville TH Primary highway, Light-duty road, hard or 2 Jerseyville South TH hard surface improved surface 3 Brighton 45 Secondary highway, 4 Grafton UE NOR hard surface Unimproved road GNETIC NOR 5 Alton TR For more information contact: 6 St. Charles, MO MA Illinois State Geological Survey 678 7 Florissant, MO 615 East Peabody Drive APPROXIMATE MEAN 8 Columbia Bottom State Route Champaign, Illinois 61820-6964 DECLINATION, 2008 (217) 244-2414 http://www.isgs.uiuc.edu IGQ Elsah-BG Sheet 1 of 2 Introduction coarse phase represents carbonate shoals (Lasemi et al. 1999) that were called the Cap au Grès Faulted Flexure (McBride and Nelson 1999). Decorah (not shown on column) are known to contain petroleum. Two oil deposited on a deeper middle shelf environment. The finer laminated car- The Cap au Grès Faulted Flexure is observed in the adjacent Grafton wells have been drilled to the west in the Grafton Quadrangle, and sev- The Elsah Quadrangle is located along the western edge of the Illinois bonate beds represent shallow tidal flat conditions. Either sea level was Quadrangle to the east where over 900 feet of vertical offset can be ob- eral wells have been drilled to the east in the Alton Quadrangle, but no Basin in southwestern Illinois in Jersey and Madison Counties. The Mis- fluctuating during the deposition of the Salem or the northern shelf of the served (Denny and Devera 2002). The east end of the Cap au Grès dis- deep oil or gas test has been drilled in the Elsah Quadrangle. sissippi River flows east-southeasterly through the center of the quad- Ozarks was tectonically “bobbing” at this time. Riehl Quarry (Sec. 31, appears beneath Mississippi River alluvium and can not be accurately rangle and separates Illinois from Missouri. The bedrock geology in the T6N, R10W) offers excellent exposures of the Salem Limestone. At this traced. Bedding along the south or southwest flank commonly dips 60° Acknowledgments Illinois portion of this quadrangle is depicted on the map. Mississippian quarry, 75 feet of Salem can be observed with the basal portion of the or steeper, and in places it is overturned. Detailed mapping near the Cap age bedrock units are exposed in the upland portions of the map sheet overlying St. Louis Limestone at the top of the quarry. Within the Salem au Grès in the Grafton Quadrangle indicates that the lower Mississippian This research was supported in part by the U.S. Geological Survey, Na- underlying Pleistocene loess. The loess units have not been depicted on at this quarry, 21 (non-hindeodellid) conodont species per kilogram of sediments thin toward the Cap au Grès, suggesting that the structure was tional Cooperative Geologic Mapping Program (STATEMAP) under U.S. the map. Pleistocene age glacial sediments occur along Piasa and Mill sample were identified (Collinson et al. 1979). Endothyrid foraminifers active starting in Upper Devonian and continuing sporadically through Geological Survey award number HQ97AG01820. The views and con- Creeks and the Mississippi River underlying Holocene Age sediments of are common, and the index fossil Globoendothyra baileyi was identi- the lowest Pennsylvanian (Denny and Devera 2002). Analysis of joint clusions contained in this document are those of the authors and should the Cahokia Formation (Grimley 2002). These units are mapped collec- fied at this location. The contact with the overlying St. Louis Limestone patterns, slip indicators on faults, and small conjugate strike-slip faults not be interpreted as necessarily representing the official policies, either tively and are depicted as Cahokia Formation on the geologic map. in adjacent quadrangles is unconformable and in places forms a karstic along the Cap au Grès led Harrison (1995 and 1997) to conclude that the expressed or implied, of the U.S. Government. limestone conglomerate or breccia. principal compressive stress axis was oriented northeast-southwest dur- Stratigraphy ing mid-Carboniferous deformation (McBride and Nelson 1999).
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