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In the Herrin Coal at Old Ben Mine No. 24 in Franklin County, multiple zones of coal balls (light gray lenticular pattern) nearly fill the seam, from roof to floor: some are intergrown; others are separated by thin layers of coal. (Photo from Philips, Avcin, and Berggren, 1976.)
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 16:36, February 16, 2024 | | 376 × 331 (116 KB) | Samantha.Hager (talk | contribs) |
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