Southeastern Illinois Geologic Map Compilation

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The Southeastern Illinois Geologic Map Compilation project produced edge-matched and updated GeMS compliant ArcGIS bedrock geologic databases of thirty-nine 7.5-minute quadrangle geologic maps in southeastern Illinois. Bedrock geologists reviewed GIS datasets and provided quality assurance on both geology and spatial orientation for 39 individual 7.5-minute quadrangles. Most of these quadrangles were mapped from the mid-1980s through 2019; nine original geologic maps of the project area were produced to complete the regional coverage area (Table 1).

Table 1. List of bedrock quadrangles compiled for project 1.
Original published map¹ Project Author(s) Year County
Akin Newly mapped for this project Hamilton, Franklin, and Saline
Broughton Newly mapped for this project Hamilton and Saline
Brownfield IGQ Nelson and Denny 2008 Massac and Pope
Carrier Mills Statemap Nelson 2007 Williamson and saline
Cave-in-Rock Statemap Seid et al. 2013 Hardin
Dekoven Statemap Seid and Denny 2013 Hardin
Eddyville IGQ-5 Nelson and Lumm 1986 Saline and Pope
Eldorado Statemap Nelson and Denny 2016 Saline
Emma Newly mapped for this project White and Gallatin
Equality IGQ-2 Nelson and Lumm 1986 Saline and Gallatin
Galatia Statemap Nelson and Denny 2015 Saline
Glendale IGQ Devera 1991 Pope and Johnson
Golconda Newly mapped for this project Pope
Grove Center Newly mapped for this project Gallatin
Harco Statemap Nelson and Denny 2015 Saline, Williamson, and Hamilton
Harrisburg Statemap Denny et al. 2007 Saline
Herod Statemap Denny et al. 2008 Saline, Pope, and Hardin
Karbers Ridge IGQ Denny et al. 2010 Saline, Hardin, and Gallatin
Little Cypress Newly mapped for this project Massac and Pope
Metropolis IGQ Nelson et al. 2002 Massac
New Haven Newly mapped for this project White and Gallatin
New Haven SW Statemap Nelson 2019 Gallatin
Norris City Newly mapped for this project White and Gallatin
Paducah East Newly mapped for this project Massac
Paducah NE IGQ Denny and Nelson 2005 Massac and Pope
Paducah West Newly mapped for this project Massac
Reevesville IGQ Nelson 1996 Johnson, Massac, and Pope
Repton Statemap Seid 2014 Hardin
Ridgway Statemap Nelson et al. 2017 Gallatin and Saline
Rosiclare Statemap Denny et al. 2011 Hardin
Rudement IGQ-3 Nelson and Lumm 1986 Saline
Saline Mines IGQ Denny et al. 2013 Gallatin and Hardin
Shawneetown IGQ-1 Nelson and Lumm 1986 Gallatin
Shetlerville Statemap Denny and Counts 2009 Pope and Hardin
Smithland IGQ Devera 2013 Massac and Pope
Stonefort IGQ-6 Nelson and Lumm 1990 Saline, Williamson, Johnson, and Pope
Wabash Island Statemap Nelson 2019 Gallatin
Walpole Newly mapped for this project Hamilton and Saline
Waltersburg IGQ-8 Weibel et al. 1991 Pope
¹Note: Original published maps were edited during edge-matching for this project.

As these maps were originally completed by different ISGS geologists over a time span of more than 35 years, there were disagreements between adjoining quadrangles. The most significant technical issues encountered were different mapped formation boundaries, fault locations, and disparate stratigraphic nomenclature. Inconsistent mapping of Quaternary units and/or glacial cover from map to map in some mapped areas were addressed. When possible, project geologist Jeremy Breeden worked with the original quadrangle author/s to address geologic incongruities.

ArcGIS work to update older GIS products to better align geologically and be compatible with the USGS geologic map schema (GeMS) was accomplished by Jeremy Breeden and Emily Bunse.

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