File:Penn caseyville 2-4.jpg
Figure 2-4. Isopach map of Morrowan Stage, which essentially corresponds to the Caseyville Formation in the Illinois Basin. From Nelson et al. (2013), after McKee and Crosby (1975), Gray et al. (1987), Greb et al. (1992), Droste and Furer (1995), and Droste and Horowitz (1998). Copyright permission granted by Micropress, 2020.
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