Computer generated map"Mapping team: Curtis C. Abert ... [et al.]."The base is an aerial photoIncludes 2 3-D views, text, col. ill., location map, and 2 stratigraphic columnsSurficial geology -- Bedrock geology -- Drift aquifers -- Bedrock Aquifers -- General aquifer sensitivity -- Aquifer sensitivity to nitrate leaching -- Coal and aggregate resources -- Bedrock topography -- Drift thickness

Digital Cartography, Abert, Curtis C.

Principle Investigator, Lasemi, Zakaria

Principle Investigator, Mikulic, Donald G.

English

Illinois Digital Environment for Access to Learning and Scholarship Repository

Bedrock GeologyPuMuMDnaDlSuSurficial GeologyQlQh QeQcDrift Thickness Bedrock Topography Coal and Aggregate ResourcesBedrock AquifersDrift AquifersAquifer Sensitivity to Nitrate LeachingGeneral Aquifer SensitivityVilla GroveCamargoWest North3-Dimensional view of bedrock units(vertical exaggeration = 25X)OkOmSuPuMuMDnaDlDgtGeologist describing core fromdeep test boringBedrock (Paleozoic) UnitsPennsylvanian (undifferentiated)gray, silty shale, with layers of coal, claystoneand black, laminated shale; lower part isdominated by light gray, quartz sandstone, near the top is a  brownish-gray limestone bedMississippian (undifferentiated)greenish-gray, noncalcareous siltstone with layers of fine-grained quartz sandstone in thelower part; light brownish-gray crinoidallimestone at bottom of unitNew Albany Shale (Mississippian toDevonian):  light greenish-gray shale to brownish-black organic-rich shaleLingle Limestone (Devonian):light gray to brownish-gray fossiliferous limestone overlain by medium-crystalline, brown, fossiliferous dolomite with oil-richzonesGrand Tower Dolomite (Devonian):light tan, microcrystalline dolomite with common stromatalitic laminations and a prominent, thin bentonite bed near the topSilurian (undifferentiated) layered limestone and gray lime mudstone in lower part; dark  greenish-gray, clayey, cherty dolomite and shale in middle part; massive gray-brown dolomite with crinoids, bryozoans, and oil-rich zones in upper partMaquoketa Shale (Orodovician): dark gray, organic-rich shale with a prominent limestone bed near the middleKimmswick Limestone (Orodovician):mottled tan to light gray-brown to nearly whitebioclastic grainstone with oil-rich zones and layers of lime mudstonePuMuMDnaDlDgtSuOmOkHand-augered boring3-Dimensional view of glacial and post-glacial units(vertical exaggeration = 25X)West NorthQeQhQbQgQlQbsExposure of Quaternary materials overlying Devonian bedrock at Tuscola QuarryAVAILABLE PRODUCTSDigital Orthophoto Image Map, 1999, IGQ Villa Grove-OISurficial Geology Map, 1999, IGQ Villa Grove-SG3-Dimensional Depiction of Quaternary MaterialsBedrock Geology Map3-Dimensional Depiction of Bedrock UnitsGroundwater Resource MapAggregate ResourcesGeotechnical PropertiesDrift Thickness Map, 1999, IGQ Villa Grove-DTBedrock Topography Map, 1999, IGQ Villa Grove-BTAquifer Sensitivity Map, 1999, IGQ Villa Grove-ASCoal Resources, 1999, IGQ Villa Grove-CROTHER PRODUCTS (AVAILABLE SOON)Cahokia Formation:up to 20 feet of stratified silt withsand and clay lensesWisconsin EpisodePeoria Silt  over Doltonfacies of the Henry Formation:1 to 4 feet of massive silt overlyingup to 11 feet of stratified sand and siltPeoria Silt over Equality Formation:1 to 4 feet of massive silt overlying up to 20 feet of laminated silt with clay lensesPeoria Silt over Batestown Memberof the Lemont Formation:1 to 4 feet of massive silt over silt loamdiamicton, may be underlain by thinTiskilwa Formation (pink loam diamicton)Moraines shown in stippled patternIllinois EpisodeGlasford Formation:up to 50 feet of loam diamicton, may beunderlain by undifferentiated diamictons,sand and gravel may occur at top or basePre-Illinois EpisodesBanner Formation:up to 235 feet of undifferentiated silt to siltloam diamictons; may be underlain by upto 50 feet of sand and gravel (shown with brownish-red)Glacial drift and post-glacial (Quaternary) UnitsQcQhQeQgQbQbsQlINTRODUCTIONThe Illinois State Geological Survey (ISGS) has begun an ambitious geologic mapping program to address the environmental and economic challenges faced by the State.  Detailed information showing the complex variability of geologic materials below the ground surface provides for meaningful and informed decisions concerning land use and environmental protection.  Three-dimensional mapping is essential in this regard.  Under the program, all 1,071 of the 7.5-minute quadrangles in Illinois will eventually be mapped.  The intent is to increase awareness of geology and geologic processes by developing maps and associated database products for use by local, state, and federal agencies, educational institutions, private industry, and the public.THREE-DIMENSIONAL GEOLOGIC MAPPINGThe block diagram showing Quaternary deposits shows that  broad regions of the quadrangle are occupied by diamictons of the last three glaciations separated in some areas by sand and gravel. The drift thickness map indicates that about one-half of the quadrangle has Quaternary material over 200 feet thick.  The form of the surface between the Quaternary deposits and bedrock is best shown on the bedrock topography map. Deep valleys carved into the bedrock surface are prevalent in the northern and eastern portions of the quadrangle. Uppermost bedrock materials consist mostly of shales that range in age from Devonian to Pennsylvanian and dip in a southeastward direction.  Structure within the bedrock is dominated by the La Salle Anticlinorium, an upward bend in the Earth’s crust. This results in much older bedrock units being very close to the surface in the west-central portion of the quadrangle and allows for economic extraction of the older rock for aggregate at the Tuscola Quarry. METHODOLOGYGeologic map products are available  at a scale of 1:24,000 are portrayed at a reduced scale on this poster.  A digital orthophotograph  with a 2-meter ground resolution comprises the background of the poster.Methods for computing  a three-dimensional geological atlas have been tested through a pilot mapping program in the Villa Grove Quadrangle, in Douglas County, east-central Illinois.  Recent advances in computer technology, geographic information systems (GIS), and 2-D and 3-D modeling software now provide earth scientists with innovative methods to gather, display, and analyze scientific information in ways not previously possible. These advances have led to a change in the function of geologic maps.  For the first time, they form the basis for interactive decision-support systems that can result in user-friendly derivative map products geared toward addressing specific societal needs.  Maps showing environmental conditions (such as aquifer sensitivity) and mineral resources (such as coal and aggregate materials) are now digitally derived directly from interpretations of the basic geology.  Three-dimensional models of both Quaternary (glacial and post-glacial) deposits and bedrock deposits are key components of the mapping program.  Obtaining the necessary data to build these digital models  required considerable effort.  In mapping the Villa Grove Quadrangle, existing data from well logs, cores, and drill cuttings on file at the ISGS were examined to verify data quality and locations, and new data were obtained from test drilling, hand augering, other field work, and laboratory analyses. DERIVATIVE MAPSA derivative map presents an interpretation of  geologic materials for specific environmental or resource purposes.  A three-dimensional understanding of the continuity, thickness, and properties of a geologic material is required for such interpretations.  Detailed geologic mapping and derivative maps provide a scientific and objective basis for land-use and environmental planning and mineral resource development. For the Villa Grove Quadrangle, derivative maps have been produced showing the potential sensitivity of aquifers to contamination, potential groundwater resources, and available coal and aggregate resources.  Because of the digital nature of the map data, it would be possible to produce many more derivative map products than those shown here. - The groundwater resources maps show sand and gravel aquifers within 100 feet of the land surface and deeper than 100 feet, and the depth to and distribution of bedrock aquifers that yield potable water.- The general aquifer sensitivity map, based on depth to the shallowest aquifer and aquifer thickness, shows areas most vulnerable to waste disposal operations and potential spills of hazardous substances.- A second sensitivity map combines aquifer depth and thickness with soil properties to derive a map showing potential contamination of aquifers from nitrates, which are generated from fertilizers and septic effluent.- The map showing the thickness and distribution of the Herrin (#6) Coal suggests a potential resource in the southeastern portion of the quadrangle.- Limestone and dolomite  resources are currently mined at the Tuscola quarry.  Potential for expansion is limited by thickness of overburden and character of the bedrock.  The map indicates that additional surface-minable resources are present near the quarry where the depth to bedrock is less than 60 feet deep.Scale for inset mapsLocation of QuadrangleFor more information, please contact:Illinois State Geological Survey615 East Peabody DriveChampaign, IL  61820(217) 333 - ISGS (4747)http://www.isgs.uiuc.eduMulti-Dimensional Geologic Mapping of the Villa Grove Quadrangle, Douglas County, IllinoisIllinois State Geological SurveyWilliam W. Shilts, ChiefProject Principle Investigators:Zakaria Lasemi, Donald G. MikulicDigital Cartography:Curtis C. AbertMapping Team:Curtis C. Abert, Richard C. Berg, Subhash B. Bhagwat, Ross D. Brower, Pamela K. Carrillo,Philip J. DeMaris, Ardith K. Hansel, Donald E. Luman, Randall E. Hughes, Alison B. Lecouris,Rodney D. Norby, Michael L. Sargent, Lisa R. Smith, Colin G. Treworgy, C. Pius Weibel, Ellen M. WolfDepartment of Natural ResourcesILLINOIS STATE GEOLOGICAL SURVEYIllinois Geologic Quadrangle Map:  IGQ Villa Grove-POWilliam W. Shilts, Chief2000

Multi-dimensional Geologic Mapping of the Villa Grove Quadrangle, Douglas County, Illinois

https://www.ideals.illinois.edu/bitstream/2142/77947/3/villagrove-po.pdf

Multi-dimensional Geologic Mapping of the Villa Grove Quadrangle, Douglas County, Illinois

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