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Surficial Geology and Elevation Data

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Surficial Geology


Glacial Boundaries

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Glacial boundary lines representing the extent of glaciation for major glacial episodes in Illinois. Data originally from Quaternary Deposits in Illinois map by Lineback (1979) and modified according to the reclassification by Hansel and Johnson, ISGS Bulletin 104 (1996). Attribute items include glacial episode identifier. ISGS, 1984 (revised 1998).


Driftless Areas

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Driftless areas in Illinois. These areas are analogous to areas of the state where the bedrock surface is not buried by glacial drift. Data originally from the Buried Bedrock Surface map by Herzog et al. (1994). There are no user defined attribute items. ISGS, 1994 (revised 1998).


Glacial Drift Thickness and Character

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Unconsolidated deposits, mainly glacial drift, overlie the bedrock surface in most of Illinois. Data are originally from ISGS Circular 490 by Piskin and Bergstrom (1975), Plate 1. Contour lines are coded with thickness, and polygons (areas between contours) are coded with range of thickness. ISGS, 1994 (revised 1998).


Moraines (End Moraines) of the Wisconsin Episode

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Named Woodfordian moraines, or Wisconsinan End Moraines, of Illinois. Data originally from ISGS Bulletin 94, Pleistocene Stratigraphy of Illinois, Willman and Frye, 1970. Attributes include moraine name. ISGS, 1991 (revised 1998).


Physiographic Divisions

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The Physiographic divisions of Illinois, including Provinces, Sections, and Divisions. Data are originally from ISGS Report of Investigations 129 by Leighton et al., 1948. Provinces, sections, and divisions are 'labeled' with annotation as most of the areas are not closed polygons (within Illinois). ISGS, 1993 (revised 1998).


Quaternary Deposits, 1979

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Quaternary Deposits in Illinois that lie at or near the land surface, including loess deposits. Data originally from Quaternary Deposits of Illinois, Lineback (1979). Attributes include geologic unit name information, unit code, and map symbol, ISGS, 1984.


Quaternary Deposits, 1996

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Updated version of Quaternary Deposits of Illinois. Information contained in this data set is more generalized than the 1979 version. While the 1979 version is more detailed, it lacks recent updates which have been added to the 1996 version. Attributes include geologic unit name information, unit code, and map symbol, ISGS, 1996.


Soil Associations Map (500K)

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Soil associations in Illinois. A soil association is a group of related soil series that generally occur in a characteristic pattern of landscapes that have identifiable topographic features, slopes, and parent materials. Data are originally from the General Soil Map of Illinois (Fehrenbacher, 1982). Attributes include combined parent material amd soil association codes. ISGS 1984.


Stack-Unit Mapping of Geologic Materials to a Depth of 15 meters

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Stack-Unit mapping of geologic materials to a depth of 15 meters. Stack-unit maps show the distribution of earth materials vertically from the surface to a specified depth and horizontally over a specified area. They also show succession of geologic units in order of occurrence. Primary source is ISGS Circular 542, Stack-unit Mapping of Geologic Materials in Illinois to a Depth of 15 Meters, Berg and Kempton (1988). Attributes include stack-unit coding and map symbols. ISGS, 1988 (revised 1995, 1998).



Elevation Data


Surface Elevation: 30-Meter Digital Elevation Model (DEM)

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A digital elevation model (DEM) in ArcINfo grid format. Data were assembled to provide a statewide database of surface elevation points suitable for analyses of statewide geologic phenomena associated with elevation. ISGS, 2003.


Surface Elevation: 30-Meter Shaded Relief Map

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Landforms of Illinois with a shaded relief portrayal. Derived from USGS Digital Elevation Model(DEM) data. Illustrates various Illinois landforms including glacial moraines, river valleys, glacial till plains, and bedrock structures. No attributes present. ISGS, 2003.


Surface Elevation: 301-Foot Digital Elevation Model (DEM)

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A digital elevation model (DEM) in ArcINfo grid format. Data were assembled to provide a statewide database of surface elevation points suitable for analyses of statewide geologic phenomena associated with elevation. ISGS, 1995.


Surface Elevation: 301-Foot Shaded Relief Map

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Landforms of Illinois with a shaded relief portrayal. Derived from USGS Digital Elevation Model(DEM) data. Illustrates various Illinois landforms including glacial moraines, river valleys, glacial till plains, and bedrock structures. No attributes present. ISGS, 1994.