Illinois Map - Illinois State Geological Survey

The IMAP series includes maps with a variety of geologic themes covering the entire state or a region of the state. Maps in the series include stratigraphic legends, brief descriptive text or longer associated reports, geologic cross sections or models, and illustrative diagrams and tables. These maps are peer reviewed and conform to ISGS standards. The first map in the series was published in 1993. This series includes maps that do not meet other series definitions. No previously published maps will be included in this series. NOTE: Illinois Map no. 4 was never used.

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