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Illinois Counties |
The counties of Illinois are shown on this map.
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ISGS 8.5 x 11 map series |
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Statewide |
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Quaternary (Ice Age) Deposits |
This map shows the location of postglacial and late glacial deposits such as river, beach, wind, and lake water deposits as well as other materials deposited during the Wisconsin, Illinois, and pre-Illinois episodes.
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ISGS 8.5 x 11 map series |
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Statewide |
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Water Table Map of Renault Quadrangle, Monroe County, Illinois |
Please contact authors for more information.
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Water Table |
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Renault |
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Samuel V. Panno |
Quadrangle |
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End Moraines of the Wisconsin Glacial Episode |
Wisconsin Episode moraines arc across northern Illinois and indicate the position of temporary stationary ice fronts as the ice retreated. (File size: 494 KB)
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ISGS 8.5 x 11 map series |
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Statewide |
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Bedrock Topography of Brussels Quadrangle, Calhoun and Jersey Counties, Illinois |
Please contact authors for more information.
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Bedrock Topography |
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Brussels |
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Mary J. Seid, Joseph A. Devera |
Quadrangle |
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Surficial Geology of Reevesville Quadrangle, Johnson, Massac, and Pope Counties, Illinois |
Please contact authors for more information.
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Surficial Geology |
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Reevesville |
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Leon R. Follmer |
Quadrangle |
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Illinois Surface Topography (letter) |
A computer-generated map showing the elevation of the surface of the state. A 36" x 64" version of this map may be purchased by contacting the ISGS Information Office.
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Statewide |
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Bedrock Topography of Collinsville Quadrangle, Madison and St. Clair Counties, Illinois |
Please contact authors for more information.
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Bedrock Topography |
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Collinsville |
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Andrew C. Phillips |
Quadrangle |
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Bedrock Topography of West Chicago Quadrangle, Cook and DuPage Counties, Illinois |
Please contact authors for more information.
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Bedrock Topography |
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West Chicago |
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B. Brandon Curry |
Quadrangle |
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Surficial Geology of Kellerville Quadrangle, Illinois |
Please contact authors for more information.
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Surficial Geology |
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Kellerville |
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Michael L. Barnhardt, Myrna M. Killey, Donald E. Luman |
Quadrangle |