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Clay dikes or horsebacks: (left) in the Springfield (No. 5) Coal at a surface mine in west-central Illinois; (right) in the Springfield Coal and overlying black shale at the abandoned El-Ben Mine in Logan County. The dike at the El-Ben Mine branches upward into myriad, small fissures, and veinlets that severely inhibit roof stability (photo shows Ronald Kern, formerly of the ISGS). (Photos by H. H. Damberger.)
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| current | 13:08, February 16, 2024 | | 694 × 500 (531 KB) | Samantha.Hager (talk | contribs) |
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