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19 Titles Match Your Query
Showing 1 through 19 of 19
1. Bedrock Geology of Illinois [IGDNR_BEDGEO]
This map shows the distribution and extent of the bedrock geologic units within the State of Illinois, as depicted on the Geologic Map of Illinois (1967) by Willman and others, published ...


2. Bedrock Valleys of Illinois [IGDNR_ALLST_BEDVAL]
This data set shows continuous lines representing the lowermost elevations/locations of (buried) bedrock valleys in the state of Illinois. Additionally, names of buried valleys are annotated. ...


3. Buried Bedrock Surface of Illinois [IGDNR_BEDTOPO]
The Buried Bedrock Surface of Illinois map represents the first revision of the bedrock topography map since the second edition was published by the Illinois State Geological Survey (Horberg, 1957). ...


4. Coal Stratigraphic Data [IGDNR_ALLST_COALSTRAT]
ASCII database of stratigraphic information for the Danville, Herrin, and Springfield Coals from over 25,000 drill hole and outcrop descriptions of Pennsylvanian stratigraphy. Coordinates ...


5. Coarse-grained Materials Within 50 Feet of the Ground Surface in Illinois [IGDNR_ALLST_AQ50]
This map shows the distribution of coarse-grained materials and permeable bedrock within 50 feet of ground surface in Illinois. This includes bedrock, sand and gravel, and alluvial units ...


6. Digital Elevation Model (DEM) of Illinois at 1:250,000 [IGDNR_ALLST_INT]
This Arc/Info grid (raster) data set consists of edge-matched USGS 1:250,000 DEM tiles for Illinois. Cell size is 301 feet and cell values are elevations in meters above mean sea level ...


7. Driftless Areas in Illinois [IGDNR_DRIFTLESS]
This is an Arc/Info polygon data set containing driftless areas in Illinois. These areas are analogous to areas of the state where the bedrock surface is not buried. Data are originally ...


8. Glacial Drift in Illinois: Thickness and Character [IGDNR_DRIFTTHK]
This map is a digital Arc/Info line and polygon coverage of drift thickness in Illinois. Data are originally from ISGS Circular 490 by Piskin and Bergstrom (1975), Plate 1. Contours (lines) ...


9. Hydrologic Catalog-Units for Illinois [IGDNR_ALLST_CATUNITS]
USGS hydrologic cataloging units for the state of Illinois. The USGS has divided each state into regions, subregions, accounting units, and cataloging units. All of Illinois is in region ...


10. Major Bedrock Aquifers Within 300 Feet of Ground Surface [IGDNR_ALLST_AQMB300]
This map shows the distribution of major bedrock aquifer units within 300 feet of ground surface containing potable water in Illinois. Major aquifers are capable of yielding 70 gallons ...


11. Major Bedrock Aquifers Within 500 Feet of Ground Surface [IGDNR_ALLST_AQMB500]
This map shows the distribution of major bedrock aquifer units within 500 feet of ground surface containing potable water in Illinois. Major aquifers are capable of yielding 70 gallons ...


12. Oil and gas fields in Illinois [IGDNR_ALLST_OILFIELDS]
This map shows oil and gas fields in Illinois as of 1984. Scale is 1:500,000. To show oil and gas fields. These data are appropriate for use in local and regional thematic analysis. ...


13. Shaded Relief Map of Illinois [IGDNR_SHADEDREL]
This map shows the landforms of Illinois with a shaded relief portrayal. Nominal map scale is 1:250,000. This TIF image was derived from USGS Digital Elevation Model (DEM) data. ...


14. Slopes in Illinois Derived from the USGS Digital Elevation Model (DEM) from the Illinois State Geological Survey [IGDNR_STSLOPE]
Such data are useful in creating shaded relief images, characterizing topography and morphology, analyzing erosion potential and gross stream valley characteristics, and investigating ...


15. Statewide Surface TIN of Illinois [IGDNR_ALLST_TIN]
These data are a Triangular Irregular Network (TIN) surface topography representation for the state of Illinois. The data include all of Illinois and extend approximately nine miles beyond ...


16. Structural Features in Illinois: Areal Extent of Anticlines, Domes, and the Glasford Disturbance (Polygon Features) [IGDNR_STRUCTPOLY]
These data are for use at a scale of 1:500,000 or smaller only. They are appropriate for use in regional thematic analysis, for display purposes, and for mapping environmental phenomena ...


17. Structural Features in Illinois: Faults [IGDNR_STRUCTFAULTS]
These data are for use at a scale of 1:500,000 or smaller only. They are appropriate for use in regional thematic analysis, for display purposes, and for mapping environmental phenomena ...


18. Structural Features in Illinois: Line Features (Axial or Flexure) of Anticlines, Synclines and Monoclines [IGDNR_STRUCTCLINES]
These data are for use at a scale of 1:500,000 or smaller only. They are appropriate for use in regional thematic analysis, for display purposes, and for mapping environmental phenomena ...


19. Structural Features in Illinois: Point Locations of Impact Features, Explosion Features, Silurian Reefs, and Buried Precambrian Hills [IGDNR_STRUCTPNTS]
These data are for use at a scale of 1:500,000 or smaller only. They are appropriate for use in regional thematic analysis, for display purposes, and for mapping environmental phenomena ...


Showing 1 through 19 of 19
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