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- |category3=Chazyan Stage |tree24=Chazyan Stage2 KB (267 words) - 19:57, 12 January 2017
- |category3=Chazyan Stage |tree24=Chazyan Stage3 KB (368 words) - 19:57, 12 January 2017
- |category3=Dresbachian Stage |tree24=Dresbachian Stage4 KB (625 words) - 20:41, 11 January 2017
- ...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 interr12 KB (1,815 words) - 15:57, 12 January 2017