File:Penn caseyville 2-1.jpg
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Figure 2-1. Map showing the type area of the Caseyville Formation and several of its members. Map drafted by Alan Myers. Base is a U.S. Geological Survey Dekoven 7.5-minute topographic map. Base map courtesy of the U.S. Geological Survey.
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|current||16:12, 20 July 2020||2,551 × 3,300 (10.33 MB)||IlLex|