File:Rolls fig24a.png

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Rolls_fig24a.png ‎(605 × 415 pixels, file size: 206 KB, MIME type: image/png)

Part of a large sandstone-filled roll in the Herrin (No. 6) Coal at Inland Steel Mine No. 1 in Jefferson County. The lower part of the coal seam pitches sharply downward beneath the roll. (Chris Watson of Inland Steel Company is holding the ruler.)

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current10:59, February 16, 2024Thumbnail for version as of 10:59, February 16, 2024605 × 415 (206 KB)Samantha.Hager (talk | contribs)

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