File:Penn carbondale 4-4.jpg

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Figure 4-4. Thickness of the Carbondale Formation in Illinois. From Willman et al. (1975), based on a map by K.E. Clegg. Copyright ©1975 University of Illinois Board of Trustees.

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current20:56, 22 December 2020Thumbnail for version as of 20:56, 22 December 20201,064 × 1,745 (702 KB)Jennifer.Obrad (talk | contribs)

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