Galatia Channel:Underclay of Springfield Coal: Revision history

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  • curprev 20:4020:40, 9 July 2020Alan.Myers talk contribs 3,107 bytes +3,107 Created page with "==Underclay of Springfield Coal== Like most coal beds in the Illinois Basin, the Springfield normally is underlain by nonfissile mudstone that miners call underclay. Features..."