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  • Grove Church Shale
    |category7=Shale |tree2=Grove Church Shale
    3 KB (430 words) - 16:00, 13 January 2017
  • Walnut Grove Limestone Member
    |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
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