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Figure 19 Photograph of “rolls” at the top of the Springfield Coal, filled with Dykersburg sediments, at American Coal’s Millennium Mine in Saline County, Illinois. Ragged splaying of coal layers at the margins of rolls evokes fibrous peat layers ripped out by strong currents.

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current15:14, 9 July 2020Thumbnail for version as of 15:14, 9 July 20202,116 × 1,586 (932 KB)Alan.Myers (talk | contribs)