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  • Boles Member
    |tree4=Boles Member ...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.
    3 KB (366 words) - 18:30, 12 January 2017
  • Defiance Member
    |tree4=Defiance Member ...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.
    2 KB (325 words) - 18:28, 12 January 2017
  • Joachim Dolomite
    ...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p. In Missouri the name "Joachim" is restricted to the units below the Boles, and the overlying beds are included in the Rock Levee Formation.
    5 KB (690 words) - 18:18, 12 January 2017
  • Augusta Member
    |tree4=Augusta Member ...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.
    3 KB (383 words) - 18:32, 12 January 2017
  • Search:Ordovician System
    rect 300 922 396 933 [[Blodgett_Member|Blodgett Member]] rect 306 154 401 165 [[Clermont_Shale_Member|Clermont Shale Member]]
    8 KB (774 words) - 14:49, 30 March 2020
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