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  • Charter Member
    |tree3=Charter Member ...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.
    2 KB (260 words) - 23:03, 11 January 2017
  • Mt. Simon Sandstone
    ...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p. ...grained), Lacey Member (pebbly), Gunn Member (medium grained), and Charter Member (pebbly). These units are recognized in borings in north-central Illinois (
    5 KB (658 words) - 23:02, 11 January 2017
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