J Carrell

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Base map compiled by Illinois State Geological Survey from Digital Line Graph (DLG) data provided by the United States Geological Survey. Hypsography and topography updated from imagery dated 1998. State of Illinois make no guarantee, expressed or implied, regarding the correctness of the interpretations presented in this document and accept no liability(More)
This Illinois Preliminary Geologic Map (IPGM) is a lightly edited product, subject to less scientific and cartographic review than our Illinois Geological Quadrangle (IGQ) series. It will not necessarily correspond to the format of IGQ series maps, or to those of other IPGM series maps. Whether or when this map will be upgraded depends on the resources and(More)
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