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  • Chazyan Stage
    |category3=Chazyan Stage |tree24=Chazyan Stage
    2 KB (267 words) - 19:57, 12 January 2017
  • Everton Dolomite
    |category3=Chazyan Stage |tree24=Chazyan Stage
    3 KB (368 words) - 19:57, 12 January 2017
  • Knox Dolomite Megagroup
    |category3=Dresbachian Stage |tree24=Dresbachian Stage
    4 KB (625 words) - 20:41, 11 January 2017
  • Ordovician System
    ...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p. ...a lesser but widespread unconformity occurs at the base of the Trentsnian Stage. The Champlainian rocks contain numerous minor diastems that reflect interr
    12 KB (1,815 words) - 15:57, 12 January 2017
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