"Geology based on field work and data analysis by Leon R. Follmer and W. John Nelson, 2001-2004."Relief shown by contours and spot heights"Ã 2010 by the Board of Trustees of the University of Illinois."Includes location map, index to adjoining quadrangles, and index to Williamson County surficial geology and 7.5-minute quadrangle

Domier, Jane E.J.

Follmer, Leon R.

Nelson, W. John

Illinois Digital Environment for Access to Learning and Scholarship Repository

"e "e"e"e"e"e4-624044240432402424023 24022ggccgg(s)gcccplg(s)cg(s)g(s)clscccg(s)&&&&&&&&g(s)cg(s)g(s)g(s)cg(s)dgplg(s)cc&g(s)g(s)g(s)cc&plg(s)lsg(s)g(s)dgplc&&&&&&&&&&&pldgplcg(s)plgg(s)g(s)ccccg(s)dgcg(s)&g(s)g(s)g(s)g(s)plcplplplccg(s)g(s)plg(s)plcg(s)plg(s)g(s)g(s)g(s)g(s)g(s)g(s)plg(s)dggggggg ggcccccccccccccc&&&&&&&&&&&&&& &&&&&&&&&&&&&&&&&&&&&&Illinois Geologic Quadrangle MapIGQ Pittsburg-SGBase map compiled by Illinois State Geological Survey from digital data provided by the United States Geological Survey. Topography by photogrammertric methods from aerial photographs taken in 1959. Field checked in 1963.North American Datum of 1927 (NAD 27)Projection: Transverse Mercator10,000-foot ticks: Illinois State Plane Coordinate system, east zone (Transverse Mercator)1,000-meter ticks: Universal Transverse Mercator grid system, zone 16Recommended citation:Follmer, L.R., and W.J. Nelson, 2010, Surficial Geology of Pittsburg Quadrangle, Williamson and Franklin Counties, Illinois: Illinois State Geological Survey, Illinois Geologic Quad-rangle Map, IGQ Pittsburg-SG, 1:24,000.Geology based on field work and data analysis by Leon R. Follmer and W. John Nelson, 2001–2004. Natural Resource Conservation Service staff, Carbondale office, assisted with field work and the drilling of stratigraphic test borings.Digital cartography by Jane E. J. Domier, Jennifer E. Carrell, Amanda Tovey, Joseph B. Magnotta, and Daniel R. Stevenson, 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 in this document are not meant to be enlarged. IGQ Pittsburg-SG  SURFICIAL GEOLOGY OF PITTSBURG QUADRANGLEWILLIAMSON AND FRANKLIN COUNTIES, ILLINOISLeon R. Follmer and W. John Nelson20102°APPROXIMATE MEANDECLINATION, 2010MAGNETIC  NORTHTRUE  NORTHROAD CLASSIFICATIONPrimary highway,hard surfaceSecondary highway,hard surfaceLight-duty road, hard orimproved surfaceUnimproved roadADJOINING QUADRANGLES1 West Frankfort2 Thompsonville3 Akin4 Johnston City5 Harco6 Marion7 Crab Orchard8 Carrier MillsBASE MAP CONTOUR INTERVAL 10 FEETNATIONAL GEODETIC VERTICAL DATUM OF 19291 2 34 56 7 8© 2010 by The Board of Trustees of the University of Illinois. All rights reserved.7000 FEET1000 10000 2000 3000 4000 5000 6000.5 1 KILOMETER1 0SCALE 1:24,0001/ 21 0 1 MILEInstitute of Natural Resource SustainabilityWilliam W. Shilts, Executive DirectorILLINOIS STATE GEOLOGICAL SURVEYE. Donald McKay III, DirectorFor more information contact:  Institute of Natural Resource Sustainability Illinois State Geological Survey  615 East Peabody Drive Champaign, Illinois 61820-6964 (217) 244-2414 http://www.isgs.illinois.eduWilliamson County surficial geology and 7.5-minute quadrangles.MARIONHERRINPITTSBURGCRAB ORCHARDJOHNSTONCITYCRAB ORCHARDLAKEHARCODE SOTOCARRIERMILLSGOREVILLELICKCREEKCARBONDALECREALSPRINGSSTONEFORTMAKANDAEquality–fineEquality–siltyEquality–sandyDisturbed groundCahokia FmTeneriffe Silt Pearl FmGlasford FmGlasford Fm–stratifiedloess bedrockwater0 2 4 6MILEScdgls&gg(s)plInterpretationMade land; mostly strip mines, includes disturbed land and reclaimed landAlluvium; mostly formed during post-glacial times (Holocene); largely derived from eroded Peoria loess; mildly weathered and leached; weakly developed soil profile in the upper 5 feet; underlain by Equality clay or fine sand at lower elevations and by bedrock at higher elevationsWeathered loess, 4 to10 feet thick containing well-developed modern soil (Alfisol) overlying Pennsylva-nian bedrock; contains three loess units distinguishable where thick: upper–Peoria Silt, yellowish brown to gray with strong pedologic structure (modern soil); middle-Roxana Silt, reddish brown to reddish gray with weak pedologic structure, (Farmdale Geosol); lower–Loveland Silt, pale brown to dark gray with strong pedologic structure (Sangamon Geosol); Peoria and Roxana occur at most locations; Loveland is often absent; loess units largely distinguished by pedogenic features and cover most upland areas of county; bedrock exposure up to 20% of map unitGlacial fluvial and lacustrine deposits of Illinoian age covered by 4 to 10 feet of loess (Peoria, Roxana and Loveland; see comments in map unit ls); upper part contains Sangamon Geosol; forms several undifferentiated terrace levels, producing a stepped geomorphic surface; a facies member with Glasford stratified deposits (g(s)); formed during the next to the last glaciation (Illinoian) as the result of meltwater accumu-lationGeneral characteristics: Glacial till and associated water-laid and mass wasted deposits of Illinoian age covered by 5 to 10 feet of loess; largely derived from Pennsylvanian shale; forms a veneer of glacial drift deposits across the uplands of most of Williamson County and fills in preglacial valleys; loess cover thins on sloping land along the southern border of Williamson County; upper part contains Sangamon Geosol; divisible into two map units: Glasford stratified deposits (g(s)) and Glasford till (g); upland end member facies of Illinoian glacial sequenceAblation deposits; water trans-ported and glacial debris-flow deposits with soft-sediment deformation features; likely contains gravel at the base and overlies dense basal till where glacial deposits are thick; missing in places where loess overlies eroded bedrock (bench); laterally grades into till (g) or Pearl Formation sand (pl); largely restricted to discontinu-ous terrace levels (localized level areas) across the uplands at elevations from 420 up to 550 feet; formed on the Illinoian glacier after stagnation; temporary ice-walled lakes accumulated sediments that formed terraces now buried by loess; erosional benches common in some areas that form a continu-ous geomorphic surface with terraces Till; more dense and uniform than diamicton in g(s); underlies most of the gently rolling hills of the county; variable thickness ranging from a veneer of a few feet to over 100 feet thick in buried valleys; upland facies end member of Illinoian glacial sequence, made up of map units g, g(s), pl, and tr; discontinuous in places because of fluvial erosion or a nondepositional mode of the glacier (glacial erosion) InterpretationPennsylvanian sedimentary rock with less than 4 feet of weathered loess cover, mostly Peoria loess containing well-developed modern soil (Alfisol); discontinuous patches of glacial deposits are commonQUATERNARY DEPOSITSUnitHOLOCENE STAGE (Present to 10,000 years B.P.)Disturbed groundCahokia FormationWISCONSINAN STAGE (10,000 to 75,000 years B.P.)Loess over bedrockILLINOIAN STAGE (128,000 to 180,000 years B.P.)Pearl FormationGlasford Formation(divided into two units)Glasfordstratified depositsGlasford tillPRE-QUATERNARY (PENNSYLVANIAN) DEPOSITSUnitbedrockMaterialMan-made deposits; mixtures of loess, glacial deposits, shale, and coal mine wastesSilt-rich deposits ranging from silt loam to silty clay; dark gray to brown, mottled below 3 feet, totally gray below 10 feet; weakly bedded in lower part; gravel lenses in lower parts of thick intervals; noncalcare-ous matrix but contains secondary calcite nodules below solum of soil in places; ranges up to 30 feet thickSilt loam to silty clay loam, up to 10 feet thick, overlying bedrock typically sandstone or shale; yellowish and reddish brown to gray; strong pedogenic features, structure, coatings, biopores, stains, and concretionsFine sand to clay loam covered by weathered silt loam to silty clay loam; yellowish brown to mottled brown to gray; strong pedogenic features and clay-rich in upper 10 feet; leached to a depth of about 20 feet below the ground surface; calcareous and bedded in lower part; commonly thin-bedded very fine sand, well sorted with a few thin lenses of silty clay; secondary calcite common in the upper part of the calcareous zone; thickness uncertain, may range up to 50 feet thick; beds of coarser sand and gravel are expected near base of unit General features: Silty diamicton dominated by silt loam and silty clay loam with variable amounts of clay, sand, and pebbles; covered by 5 to 10 feet of weathered silty clay loam at most locations; brown to gray colors with common yellowish and dark mottles; strong pedogenic features and more sand or clay in upper 5 feet; leached to a depth of about 20 feet below the ground surface; stratified in places; dark gray, compact, and unoxidized in lower part, which commonly contains detrital wood, pyrite, and other oxidizable minerals; average thickness 20 to 30 feet and can exceed 100 feet thick in places; pebble content from <1 to 5%, dominated by Pennsylvanian lithologies, mostly sandstone, quartz, chert, and an assortment of crystalline rocksStratified clay loam, silt loam to silty clay loam with lenses of sand and loamy diamicton; deformed structures and variable fabric and textures; few fining-upward trends in places overlying sparse pebble bandsSilty clay loam diamicton that varies from pebbly silty clay to silt loam diamicton; very few pebbles in places; typical till fabric, compact and uniform MaterialDominantly sandstone with lesser amounts of siltstone, shale, mudstone, limestone, and coal; covered by yellowish brown to gray, weathered, silt loam to silty clay loam up to 4 feet thick"e35547 Stratigraphic boring with continuous samples of surficial sediments examined by the authorsContactData TypeNote: Numeric labels indicate the county number, a portion of the 12-digit API number on file at the ISGS Geological Records Unit. Online well and boring records are available from the ISGS Web site.

Surficial Geology of Pittsburg Quadrangle, Williamson and Franklin counties, Illinois

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Surficial Geology of Pittsburg Quadrangle, Williamson and Franklin counties, Illinois

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