Illinois Preliminary Geologic Map (IPGM) - Illinois State Geological Survey

This map series was published between 2004 and 2008 at a variety of map scales. Originally, the intent of this series was to publish and rapidly disseminate maps prepared for the STATEMAP component of the U.S. Geological Survey-administered National Cooperative Geologic Mapping Program contracts. Therefore, maps within the series underwent minimal review. Consequently, these maps were typically revised and improved for publication later in the Illinois Geologic Quadrangle maps series. STATEMAP products are no longer categorized into a separate series, but are published as minimally reviewed STATEMAP contract products available through the ISGS website. The series is closed; new submissions are published in the Open File, Illinois Geologic Quadrangle, Illinois County Geologic Map, or Illinois Map series.

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