Bedrock Geology of Crab Orchard Lake Quadrangle, Williamson County, Illinois

              Illinois Geologic Quadrangle Map
IGQ Crab Orchard Lake-BG
Base map compiled by Illinois State Geological Survey from digital data provided by the United States Geological Survey. Topography compiled 1963. Planimetry derived from im­agery taken 1993. PLSS and survey control current as of 1996. Partial field check 1996.
North American Datum of 1927 (NAD 27)
Projection: Transverse Mercator
10,000-foot ticks: Illinois State Plane Coordinate system, east zone (Transverse Mercator)
1,000-meter ticks: Universal Transverse Mercator grid system, zone 16
Recommended citation:
Nelson, W.J., 2007, Bedrock Geology of Crab Orchard Lake Quadrangle, Williamson County, Illinois: Illinois State Geological Survey, Illinois Geologic Quadrangle Map, IGQ Crab Orchard Lake-BG, 2 sheets, 1:24,000.
Geology based on field work and data analysis by W.J. Nelson, 2001–2003.
Digital cartography and graphics by T. Goeppinger, M. Jones, L. Verhelst, and M. Widener, Illinois State Geological Survey.
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.
IGQ Crab Orchard Lake-BG Sheet 1 of 2
BEDROCK GEOLOGY OF CRAB ORCHARD LAKE QUADRANGLE
WILLIAMSON COUNTY, ILLINOIS
W. John Nelson
20071°APPROXIMATE MEANDECLINATION, 2007MAGNETIC NORTHTRUE NORTHROAD CLASSIFICATIONPrimary highway,hard surfaceSecondary highway,hard surfaceLight-duty road, hard orimproved surfaceUnimproved roadState Route
ADJOINING
QUADRANGLES
1 De Soto
2 Herrin
3 Johnston City
4 Carbondale
5 Marion
6 Makanda
7 Lick Creek
8 Goreville
BASE MAP CONTOUR INTERVAL 10 FEET
NATIONAL GEODETIC VERTICAL DATUM OF 1929
For more information contact:Illinois State Geological Survey 615 East Peabody Drive
Champaign, Illinois 61820-6964
(217) 244-2414
http://www.isgs.uiuc.edu12345678
Released by the authority of the State of Illinois: 2007
7000
FEET10001000020003000400050006000.51 KILOMETER10SCALE 1:24,0001/2101 MILE
Illinois Department of Natural Resources
ILLINOIS STATE GEOLOGICAL SURVEY
William W. Shilts, Chief
6
"e"e"e210kCSGÄkªo20TSymbolsStrike and dip of bedding; number indicates degree of dipVertical jointOutcrop of special note, where unit or contact was well exposed at time of mappingBedrock outcropBedrock outcrop now under water, from historic field notesDrill Holes from which subsurface data were obtainedEngineering boringWater wellCoal boringDry holeDry hole - show of oilNumeric label indicates total depth of boring in feet.Boring with samples (S), geophysical log (G), or core (C). Dot indicates location accurate within 100 feet.Line Symbols dashed where inferred, dotted where concealed Contact or bed subcropPreglacial valley, drawn along axis of valley with arrows in direction of stream flow. Only well-definedvalleys are mapped.Note: This subcrop map shows the bedrock surface with all Quaternary deposits removed. Well and boring records are on file at the ISGS Geological Records Unit and are available online from the ISGS Web site. &c&tu&tlhc c d st mb PennsylvanianCarbondale hc, Houchin Creek Coal Member c, Colchester Coal Member d, Davis Coal MemberTradewater Formation, upper part st, Stonefort Limestone Member mb, top of Murray Bluff Sandstone MemberTradewater Formation, lower partAtokanDesmoinesianEXPLANATION6666666666666666666666666666dmbhcstmbcmbmbmbmbmbmbmbmbmbhchcddstmbstmbmbmbmbmbmbmbÄoÄÄÄÄÄ"e"k"k"e"e"ekS"e"k"kS"eª"e"eª"eªSªGSªGS"e"e"k"e"e"e"kSkS"kS"kS"kS"kS"kSkS"kC"kC"e"kS"kSªS"k"k"e"k"k"k"k"kS"e"k$T$T200170348335105502802329273223045271507051198440407451742202351871201752651502023202920201201363500532455135361708120604472703310033011540725017021&c&tu&tl&tl&tu&tl&tu&tu&tu&c&c&c&tu&tu&tu&tu&tu&tu&tu&c&c&tl&tl&tl&tl&tl&tl&tu&tu&tu&tl&tu