File:Penn carbondale 4-5.jpg: Difference between revisions
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Figure 4-5. Chart showing the chronostratigraphic classification and correlations among the Illinois, Midcontinent, and Northern Appalachian Basins for the Carbondale Formation and adjacent strata. Data from Peppers (1996) and Heckel (2013). Not to scale. © University of Illinois Board of Trustees.
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