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  • Stillman Member
    |tree5=Stillman Member ...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.
    2 KB (319 words) - 18:03, 12 January 2017
  • Grand Detour Formation
    ...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p. ...t Member (at the base) is pure; the Walgreen is argillaceous or shaly; the Stillman is pure, fucoidal, and massive; the Clement is calcarenite; the Hely is arg
    4 KB (585 words) - 18:01, 12 January 2017
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