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  • Eau Claire Formation
    |category7=Eau Claire Formation |tree2=Eau Claire Formation
    4 KB (620 words) - 22:57, 11 January 2017
  • Elmhurst Sandstone Member
    |category7=Eau Claire Formation |tree2=Eau Claire Formation
    2 KB (278 words) - 23:01, 11 January 2017
  • Lombard Dolomite Member
    |category7=Eau Claire Formation |tree2=Eau Claire Formation
    2 KB (288 words) - 22:59, 11 January 2017
  • Proviso Siltstone Member
    |category7=Eau Claire Formation |tree2=Eau Claire Formation
    3 KB (329 words) - 23:00, 11 January 2017
  • Mt. Simon Sandstone
    ...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p. Named for Mount Simon, an escarpment near Eau Claire, Wisconsin.
    5 KB (658 words) - 23:02, 11 January 2017
  • Dresbachian Stage
    ...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p. These strata were originally called the Dresbach Sandstone (or Formation) and in some areas are now referred to as the Dresbach Group.
    2 KB (294 words) - 22:44, 11 January 2017
  • Potsdam Sandstone Megagroup
    ...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p. ...top is placed at the top of the lowest member (Elmhurst) of the Eau Claire Formation. In southern Illinois, the top of the Potsdam is the top of the Mt. Simon S
    3 KB (436 words) - 20:54, 11 January 2017
  • Galesville Sandstone
    ...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p. ..., which in turn lies on fossiliferous sandstoneand shale of the Eau Claire Formation.
    4 KB (525 words) - 22:45, 11 January 2017
  • Cambrian System
    ...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p. ...-Tippecanoe unconformity at the base of the St. Peter Sandstone or Everton Formation. Cambrian and Ordovician strata in the interval of relatively parallel unit
    12 KB (1,792 words) - 20:42, 11 January 2017
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