File:Penn carbondale 4-2.jpg

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Figure 4-2. Reference section for the Carbondale Formation in western Illinois. After Kosanke et al. (1960). Current nomenclature is applied. © University of Illinois Board of Trustees.

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current20:44, 22 December 2020Thumbnail for version as of 20:44, 22 December 20202,308 × 2,840 (808 KB)Jennifer.Obrad (talk | contribs)

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