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library.isgs.illinois.edulibrary.isgs.illinois.edu/Maps/pdfs/igq/igq03-rudement.pdf · Carbondale Formation forms low, rounded hills in Eagle Valley and in the northern part of the

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Page 1: library.isgs.illinois.edulibrary.isgs.illinois.edu/Maps/pdfs/igq/igq03-rudement.pdf · Carbondale Formation forms low, rounded hills in Eagle Valley and in the northern part of the