File:Figure 9..png
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Distribution of roof rocks overlying the Herrin (No. 6) Coal (from Damberger, Nelson, and Krausse, 1980). Large area of thick gray shale in east-central Illinois probably represents a delta deposited in a large lake (Treworgy and Jacobson, 1979).
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| current | 11:11, February 14, 2024 | | 612 × 768 (300 KB) | Samantha.Hager (talk | contribs) |
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