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|tree5=Stillman Member ...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.

...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

rect 300 922 396 933 [[Blodgett_Member|Blodgett Member]] rect 306 154 401 165 [[Clermont_Shale_Member|Clermont Shale Member]]