File:Penn caseyville 2-4.jpg
Figure 2-4. Isopach map of Morrowan Stage, which essentially corresponds to Caseyville Formation in the Illinois Basin. From Nelson et al. (2013), modified from McKee and Crosby (1975), Grey et al. (1987), Greb et al. (1992), and Droste and Furer (1995). Copyright permission granted by Micropress, 2020.
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