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- |category7=Shale |tree2=Grove Church Shale3 KB (430 words) - 16:00, 13 January 2017
- |tree3=Walnut Grove Limestone Member ...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.3 KB (322 words) - 17:35, 11 January 2017