Relief shown by contours and spot heights"Geology based on field work by Russell J. Jacobsen, F. Brett Denny, and Gary W. Griffith, 2006-2007.""Digital cartography by Jane E.J. Domier, Shannon M. Geegan, and Steve M. Radil, Illinois State Geological Survey.""Base map compiled by Illinois State Geological Survey ... ."Includes location map and index to adjoining quadrangle

Denny, F. Brett

Griffith, Gary W.

Jacobson, Russell J.

Illinois Digital Environment for Access to Learning and Scholarship Repository

Illinois Preliminary Geologic MapIPGM Murphysboro-BT Base map compiled by Illinois State Geological Survey from digital data (Raster Feature Separates) provided by the United States Geological Survey. Topography compiled by pho-togrammetric methods from aerial photographs taken 1965. Field checked 1968. Revisions from aerial photographs taken 1976 and other source data. Map edited 1978.North American Datum of 1927 (NAD 27)Projection: Transverse Mercator10,000-foot ticks: Illinois State Plane Coordinate system, west zone (Transverse Mercator)1,000-meter ticks: Universal Transverse Mercator grid system, zone 16Recommended citation:Griffith, G.W. , F.B. Denny, and R.J. Jacobson, 2008, Bedrock Topography of Murphysboro Quadrangle, Jackson County, Illinois: Illinois State Geological Survey, Illinois Prelimi-nary Geologic Map, IPGM Murphysboro-BT, 1:24,000.Geology based on field work by Russell J. Jacobson, F. Brett Denny, and Gary W. Griffith, 2006–2007.Digital cartography by Jane E.J. Domier, Shannon M. Geegan and Steve M. Radil, Illinois State Geological Survey.This Illinois Preliminary Geologic Map (IPGM) is a lightly edited product, subject to less scientific and cartographic review than our Illinois Geological Quadrangle (IGQ) series. It will not necessarily correspond to the format of IGQ series maps, or to those of other IPGM series maps. Whether or when this map will be upgraded depends on the resources and priorities of the ISGS.The Illinois State Geological Survey, the Illinois Department of Natural Resources, and the State 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. IPGM Murphysboro-BTBEDROCK TOPOGRAPHY OF MURPHYSBORO QUADRANGLEJACKSON COUNTY, ILLINOISGary W. Griffith, F. Brett Denny, and Russell J. Jacobson20081°APPROXIMATE MEANDECLINATION, 2008MAGNETIC  NORTHTRUE  NORTHROAD CLASSIFICATIONPrimary highway,hard surfaceSecondary highway,hard surfaceLight-duty road, hard orimproved surfaceUnimproved roadState RouteADJOINING QUADRANGLES1 Ava2 Vergennes3 Elkville4 Oraville5 De Soto6 Gorham7 Pomona8 CarbondaleBASE MAP CONTOUR INTERVAL 10 FEETNATIONAL GEODETIC VERTICAL DATUM OF 1929For more information contact:Illinois State Geological Survey 615 East Peabody Drive Champaign, Illinois 61820-6964 (217) 244-2414 http://www.isgs.uiuc.edu1 2 34 56 7 8Released by the authority of the State of Illinois: 20087000 FEET1000 10000 2000 3000 4000 5000 6000.5 1 KILOMETER1 0SCALE 1:24,0001/ 21 0 1 MILEIllinois Department of Natural ResourcesILLINOIS STATE GEOLOGICAL SURVEYWilliam W. Shilts, ChiefBedrock TopographyThe map shows the topography on the top of the bedrock surface in the Murphys-boro Quadrangle (Jackson County, Illinois). The topography of the bedrock was formed in part by scouring erosional processes during preglacial and interglacial times and subsequent glacial activity. The bedrock surface lies beneath the young-er surficial sediments of glacial diamicton, lake bed deposits, and loess. This map was produced from both well and outcrop data. The well data points labeled on this map are on file at the Illinois State Geological Survey (ISGS) Geological Re-cords Unit. A bedrock geologic map of this quadrangle is also available from the ISGS (Jacobson et al. 2007). In general, the bedrock surface follows the current drainage pattern of the region. The dominant subsurface feature is a broad valley trending southeasterly through the center of the quadrangle. This probably is a result of Pleistocene glacial activ-ity. The bedrock surface is above 400 feet mean sea level along the southern and western portion of the quadrangle where glacial cover is relatively thin. South of Murphysboro the bedrock topography generally parallels the surface topography. The Big Muddy River has cut a path through the bedrock and flows in a general easterly direction across the southern portion of the map sheet near Murphysboro. Northeast of Murphysboro the glacial sediments thicken to well over 100 feet. This thick accumulation of unconsolidated sediment occurs along the present drainage of Beaucoup Creek. The data is sparse in this region but one well (Sec. 11, T8S, R2W) reaches the top of bedrock at 239 feet above mean sea level. Sev-eral other wells indicate the top of the bedrock surface is between 280 to 300 feet above mean sea level. The bedrock surface rises to approximately 400 feet on the northeast side of Glenn Creek where 10 to 30 feet of unconsolidated sediment are present over bedrock. In this region surface and underground coal mining activi-ties have provided data to fairly accurately plot the bedrock surface. MethodologyThe contour lines, which reflect the relief of the bedrock surface, are labeled as feet above mean sea level. These lines were drawn by hand using the nearest neighbor method of contouring. Contours were adjusted where outcrop exposures allowed details of the topographic surface to be observed. The accuracy of this map is dependent on the type and density of data points in a given area. Some water well records available at the ISGS were not used because the quality of the data was inadequate. This map may be updated as new data become available in the future.ReferenceJacobson, R.J., F.B. Denny, and G.W. Griffith, 2007, Bedrock geology of Mur-physboro Quadrangle, Jackson County, Illinois: Illinois State Geological Survey, Illinois Preliminary Geologic Map, IPGM Murphysboro-BG, 2 sheets, 1:24,000.Bedrock Elevation(feet above mean sea level) 440420400380360340320300280260 240220"e394Boring, including oil and gas. Boring labels indicate bedrock elevation in feet above mean sea level.Data TypeNote: Well and boring records are on file at the ISGS Geological Records Unit and are available from the ISGS Web site. 380360420400360420420300300320320320340340320320360360360380380340340360360300300280300340340400320340360400420360400380360260400340420340360380240340380340380320300320300380400360360420340420380380380340300360300300420300400360360360360340400420eeeeeeeeeeeeeeeeeee eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee eeeeeeeeeeeeeeeeeeeeeeee353420410401 368388 413372 328325385326338360290297320 366323340374325 324340 360390313293324297303370296327314269272313345297373343385379420426415424373402394382400416402428400387401404391387394 356364326360333338342348 384 304 319327337308308308311343279291292322308430344436239365376370376365371390363365376 384407413405405370373370374364393386390397374379345365296290367410401354377367

Bedrock topography of Murphysboro Quadrangle, Jackson County, Illinois

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Bedrock topography of Murphysboro Quadrangle, Jackson County, Illinois

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