Surficial Geology of Chillicothe Quadrangle, Peoria, Marshall, and Woodford Counties, Illinois

              Illinois Preliminary Geologic Map
IPGM Chillicothe-SG
Base map compiled by Illinois State Geological Survey from digital data provided by the United States Geological Survey. Digital Line Graph data from 1994.
North American Datum of 1983 (NAD 83)
Projection: Transverse Mercator
10,000-foot ticks: Illinois State Plane Coordinate system, west zone (Transverse Mercator)
1,000-meter ticks: Universal Transverse Mercator grid system, zone 16
Recommended citation:
McKay, E.D., III, R.C. Berg, A.J. Stumpf, and C.P. Weibel, 2007, Surficial geology of Chilli­cothe Quadrangle, Peoria, Marshall, and Woodford Counties, Illinois: Illinois State Geological Survey, Illinois Preliminary Geologic Map, IPGM Chillicothe-SG, 1:24,000.
Geology based on field work by E.D. McKay, R.C. Berg, A.J. Stumpf, and C.P. Weibel, 2001–2005.
This mapping was funded in part by the Illinois Department of Transportation to support planning for upgrade of Illinois Route 29.
Digital cartography by J. Carrell, J. Domier, and Z. Golshani, Illinois State Geological Survey.
GIS support by P. Johnstone, L. Smith, and B. Stiff, 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 Chillicothe-SG
SURFICIAL GEOLOGY OF CHILLICOTHE QUADRANGLE
PEORIA, MARSHALL, AND WOODFORD COUNTIES, ILLINOIS
E. Donald McKay III, Richard C. Berg, Andrew J. Stumpf, and C. Pius Weibel
20071 / °12APPROXIMATE MEANDECLINATION, 2007MAGNETIC NORTHTRUE NORTHROAD CLASSIFICATIONPrimary highway,hard surfaceSecondary highway,hard surfaceLight-duty road, hard orimproved surfaceUnimproved roadState Route
ADJOINING
QUADRANGLES
1 La Prairie Center
2 Lacon
3 Henry
4 Rome
5 Washburn
6 Spring Bay
7 Germantown Hills
8 Metamora
BASE MAP CONTOUR INTERVAL 20 FEET
SUPPLEMENTARY 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
¹ Stratigraphic nomenclature f
ollows that of Hansel and Johnson (1996) for Wisconsin and younger deposits and Willman et al. (1975) for deposits older than Wisconsin Episode; within each unit, the components are listed in order of decreasing abundance.² Stratified deposits are those formed, arranged, or laid down in layers or strata.³ Diamicton is a name for a unsorted or poorly sorted, sedimentary deposit that contains a wide range of particle sizes, such as a till that contains clay, silt, sand, gravel, cobbles and boulders.4 Geosol is a formal term for an ancient soil profile, which consists of one or more soil horizons, usually buried, that developed through weathering of deposits when they were exposed at a former land surface.ReferencesHansel, A.K., and W.H. Johnson, 1996, Wedron and Mason Groups: Lithostratigraphic reclassification of deposits of the Wisconsin Episode, Lake Michigan Lobe area: Illinois State Geological Survey, Bulletin 104, 116 p.Willman, H.B., E. Atherton, T.C. Buschbach, C. Collinson, J.C. Frye, M.E. Hopkins, J.A. Lineback, and J.A. Simon, 1975, Handbook of Illinois stratigraphy: Illinois State Geological Survey, Bulletin 95, 261 p.&cmgth(m)l-bh(p)p/tc(f)pyc(fp)gpdgh-ap/l-bh(dc)QUATERNARY DEPOSITSUnitHUDSON EPISODE (~12,000 years before present (B.P.) to today)Disturbed ground Grayslake PeatCahokia Formation(floodplain facies)Cahokia Formation(alluvial fan facies)Peyton FormationWISCONSIN EPISODE (~12,000–75,000 years B.P.)Henry Formation(Parkland facies)Henry Formation(Mackinaw facies)Batestown Member,Lemont Formationburied by >5 feet of Peoria SiltDry Creek tongue,(informal)Henry Formation Tiskilwa Formationburied by >5 feet of Peoria Silt Ashmore Tongue,Henry FormationILLINOIS EPISODE (~130,000–200,000 years B.P.)Glasford FormationPRE-QUATERNARYUnitPENNSYLVANIAN PERIOD (~280–315 million years B.P.)Carbondale and Modesto FormationsInterpretationDeposits disturbed or modified by human activity in gravel pits, coal mine spoil banks, earthen dams, other excavations, and landfillsPeat; organic-rich deposits in abandoned channels, shallow oxbow lakes and low-lying depressions on modern floodplain of Illinois River; subject to frequent flooding Alluvium (river sediment); post-glacial overbank deposits on floodplains, natural levees, and in backwater lakes; coarse deposits in channels, point bars, and tributary streamsAlluvial fan deposits; post-glacial redeposited loess and till in fans where streams and ravines emerge from uplands onto low-slope valley floors; subject to floodingSlopewash, talus, rock-fall, and slump deposits on or at base of steep slopes in small coalescing fans along bluff of Illinois River valley and its tributaires; post-glacial; may be poorly consolidated and unstableSand dunes, dune fields, and sheet deposits of sand eroded from underlying outwash and redeposited locally on Illinois River terraces; proglacial and post-glacial Fluvial (riverine) and ice-marginal outwash deposits in Illinois River valley in terraces, former bars and channels and locally in terraces along tributaries to Illinois River; deposited proglacially by meltwater from distant glaciers; not consistently differentiable from sand and gravel of the underlying Pearl Formation or Sankoty Sand Member where intervening tills are absentTill and associated sediment derived directly from glacial ice; overlain by thin covering of loess; occurs east of the western edge of the Eureka Moraine; absent in the Illinois River valley and tributary valleys, where removed by post-glacial erosionFluvial (river-deposited) and ice-marginal outwash deposits in channel fills and along former glacial margins; exposed on steep slopes, in excavations, and in the abandoned gravel pits along Dry Creek, SW NW Sec. 11, T28N, R3W, Woodford CountyTill and associated sediment derived directly from glacial ice; exposed in gullies, excavations and along steep slopes where overlying Peoria Silt and the Batestown Member have been eroded; occurs throughout the uplands; absent in the Illinois River valley and tributary valleys where removed by post-glacial erosion; where lower part of the unit is gray, the Delavan Member can be differentiated, and where it contains common wood fragments, the Oakland Member can be differentiated.Fluvial and ice-marginal outwash deposits in former bars and channels of Ancient Mississippi River; deposited by meltwater from advancing Wisconsin Episode glacier; also sheets and channels fills beneath Tiskilwa diamicton; widespread in subsurface; underlies but not differentiated from rest of Henry Formation in Illinois River valley; not consistently differentiable from underlying sand and gravel of the Pearl Formation or Sankoty Sand Member where intervening diamictons are absent Till and associated subglacially and ice-marginally deposited sediment derived directly from glacial ice; widespread, but discontinuous, having been largely removed by subsequent fluvial and glacial erosion; only exposed along Rattlesnake Hollow, Sec. 27, T12N, R9EInterpretationLithified marine, estuarine, deltaic, fluvial, and swamp deposits Description1Areas of disturbed earth and/or removed earth; grain size ranges from clay to gravel, and may include waste or other rubble Peat, organic silt, and muck, stratified2, dark gray to black, soft and compressible; may be interbedded with silt, fine sand, and clay; overlies Cahokia Formation; less than 5 feet thickSilt and clay with local surface occurrences of sand and gravel; typically grades at depth to sand or sand and gravel, which may be indistinguishable from Henry Formation; stratified, brownish gray to gray; 5 to 50 feet thickSilt and silty clay, interbedded with fine sand, and locally gravel and redeposited bedrock clasts; brownish soft to moderately stiff gray; calcareous or non-calcareous; typically overlies Cahokia or Henry Formations; interfingers with Cahokia floodplain facies; 5 to 30 feet thickSilt, clay, sand, gravel, and diamicton; unstratified to crudely stratified; yellowish brown to brownish gray; may include bedrock clasts; overlies Cahokia, Henry, or older glacial drift or bedrock; interfingers with Cahokia; 5 to 25 feet thickSand; very fine to fine, well-sorted, and loose; yellowish brown to grayish brown; calcareous in lower part; conformably overlies Henry Formation; 5 to 15 feet thickSand and gravel with cobbles and boulders; stratified; yellowish brown to grayish brown; calcareous; usually clean and moderately well sorted; unconformably overlies older sand and gravel deposits, glacial diamictons3, or bedrock; 10 to 20 feet thick in tributary valleys and 10 to 80 feet thick in Illinois River valleyPebbly silty clay loam diamicton; unstratified; olive (oxidized) to grayish brown (unoxidized); firm to hard; compact; calcareous; massive to jointed; some cobbles, few boulders; discontinuous beds of sand, gravel, silt, or clay; overlain in places by wind-blown silt (loess) of the Peoria Silt; unconformably overlies Dry Creek tongue, Tiskilwa Formation, or older units; 5 to 35 feet thickSand and gravel with cobbles; poorly sorted; yellowish brown to grayish brown; calcareous; cemented in places with calcite; grades laterally into fine-grained stratified sediments; underlies Batestown Member; unconformably overlies Tiskilwa Formation; 5 to 30 feet thickPebbly loam diamicton; unstratified, reddish brown (oxidized) to dark brownish gray with distinctive reddish cast (unoxidized); firm to hard, calcareous; some cobbles; few boulders; includes discontinuous beds of stratified sand, silt, or clay; lower 5 to 30 feet commonly more silty than upper part, usually lacks reddish cast, and may contain dispersed wood fragments and gastropod shells; unconformably overlies Ashmore Tongue, Morton Tongue silt, Roxana Silt, or older deposits; 25 to 120 feet thickFine to coarse sand, sand and gravel; occasional cobbles; yellowish brown to grayish brown; calcareous; few boulders; water saturated; occasional armored "till balls" in the upper part; calcite cemented in places; overlies older sand and gravel and diamicton deposits or bedrock; 5 to 70 feet thickPebbly loam to silty clay loam diamicton; some cobbles; few boulders; unstratified; yellowish brown (oxidized) to dark brownish gray (unoxidized); calcareous; firm to hard; discontinuous beds of sand, silt, or clay; conspicuous coal clasts; includes Radnor, Hulick and Kellerville members (diamictons) and tongues of the Pearl Formation sand and gravel; unconformably overlies bedrock; upper part weathered in profile of Sangamon Geosol4; 5 to 15 feet thickDescriptionShale, clay, sandstone, limestone, coal$T"e"e"e"e"e"kS01299OutcropStratigraphic boringWater boringEngineering boringCoal boringHand-auger boringLabels indicate samples (S). Numeric labels indicate the county number. Some county numbers are not shown in areas of closely spaced boreholes.Outcrop and hand-auger boring labels indicate geologist’s field number. Dot indicates boring is to bedrock.ContactCrest of the Eureka MoraineData TypeNote: The county number is a portion of the 12-digit API number on file at the ISGS Geological Records Unit. Online well and boring records are available from the ISGS Web site.!!!!!!!!!!!!450600500600500500600600600500640600500450500600640600680500500500600600600460700450500600600500680600450600600600460600450450604506004505006005004806006006006004506006406006006006404506805006604506006004506406004506004506405006004506005006006006005006405060048064066052060060060050066066060050066060066060050048060068066050060064050060060060060045046050050060050060050050064068060600600680600500600500600600600600600600500600600500500600500500680))))))))))))))))))))))))))))))))))))))))))))))499142337867581433161115231734251134241627103613142635121213222818192730312115518323317122010296291015322623222421202819281835395322122292929262626T. 11 N.T. 10 N.T. 12 N.T. 11 N.T. 12 N.T. 11 N.T. 29 N.T. 28 N.R. 3 W.R. 2 W.R. 3 W.R. 2 W.T. 29 N.T. 28 N.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Eureka Moraine"k"k"k"k"k"k"k"k"k"k"k"k"e"e"e"k"e"e"k"k"k"k"k"k"e"e"k"k"kS"k"k"k"k"k"k"k"k"k"k"k"e"e"e"k"k"k"e"e"e"e"e"e"k"e"e"e"e"e$*S$*S$T$0$0S$*S$*S$*S$*S$*S"e$T$T$T$T$T$T$T$T$T$T$0$0$T$T$T$T$0$T$T$T$T$T$T$T$0$T$T$T$T$T$T$T$T$TTT$T$T$T$TTT$T$T$T$0$0$0$0$T$0$0$0$0$0S$*S"k"k"k$0"k$0"k"k"k"e"k$0"k$T$T$T$T"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"e"kS"kS"kS"eS"eS"kS"eS"eS"eS$*S$*S$T$T$T$T$T$T$T$T$T$T$T$T$T$T$*S$T$T$T$T$*S"e"e"e"e"eS"e"e"e"e"eS"e"k$TTTTT2606921809235042350524497342513473123503237363420120891213142131321259212580027300042207502037720664207262069020686207082062202740015920734203042054420295206952051221892209752197421097204162148422120221683427334283342743428134272342803427534278342774303343043430034305342923429834297342963429134267342663426534263342623426134260234982148621849208322056421483206520048720831203620695206642021820543205422034600052206340018323735240410110901108011062354920706259760129924495250652349724208014322515334159249323494240372593734146202640000500004242902339534202235043427934276343023429520800207843426420739237370110722446244972349923542404653353152952852752652552452252152051651547847547458847647247146246146045945845745245145044944744644544444344143943543443343430429426425422420419296293292291288287104710451044104310421041108910391038103710361035103410321030102810271026102410231022102199598597596594532530523519473464453448442440438437436432428427424423295294290289104610401033102910252025800041000392092420961206020810209582096220890208922080520893209682065320895208962096920898206572089920973208085875895905915925935952097220965209862099209912087220871208612806320865208672086820855208572085920812208112076320807208042064920655206542065020653c(fp)tttttp/l-bp/l-bp/l-bttl-bl-bl-bth(m)c(f)tp/l-bl-bp/l-bttc(fp)c(fp)c(f)tl-bttc(f)p/l-bttc(f)l-bc(f)p/l-bp/l-bc(fp)c(fp)c(fp)c(fp)c(f)&cmtl-bp/l-bp/tp/l-bh(m)tc(fp)c(fp)pyc(fp)c(fp)c(fp)dg/hh(m)tl-bl-bgpgpttc(fp)dg/htp/l-bh(m)tp/tttp/l-bp/l-bp/l-btp/th-ath(m)pyth-ah(p)l-btl-bc(f)h(m)c(f)l-bp/l-bl-bh-atl-bl-bl-bl-bl-bh(p)h(m)tttl-bl-bl-bl-bl-bl-bttl-bdg/hl-bth(m)l-bh-al-bh-al-bp/tpypyl-bl-bc(fp)h(m)c(fp)l-bh(dc)l-bp/l-bttc(fp)p/l-bl-bh(m)l-bc(fp)&cml-bpyl-bpyl-bp/l-bl-bh(m)c(fp)p/tl-bp/tl-btl-bl-bth(m)l-bl-bh(m)p/tp/l-bl-bgpl-bl-bpyl-bc(fp)l-bh-al-btp/tl-bl-bh(m)l-bl-bl-bl-bl-bttp/tp/l-bl-bl-bc(f)h-ah(m)h(m)l-btp/t&cml-bh(m)h-ah(m)c(fp)l-bl-bl-bp/l-bc(fp)pyl-bl-bl-bl-bp/l-bp/l-bl-bh(m)l-bl-btp/l-bh(m)h(m)h(m)h(m)th-al-bh(p)h-al-bl-bl-bh(m)h(m)l-bl-bp/l-bp/tl-bl-bl-bp/l-bh(m)pyp/tl-bp/t&cmc(fp)p/l-bl-bh(m)h(m)h(m)h(m)p/th(m)h(m)&cml-bh(m)l-bdgh(m)h(m)p/l-bh(m)l-bh-a&cml-bgl-bh-ah-al-bl-bl-bl-bl-bl-bh-ah(p)l-bh(dc)l-bh-al-bl-bl-bl-bl-bl-bc(fp)l-bl-bl-bp/tp/tl-bl-bl-bh-ath(dc)l-bp/th(dc)l-bp/th(m)l-bp/tl-bh(p)c(fp)l-bl-bp/tl-bl-bl-bc(fp)ttl-btttt