Browse Illinois State Geological Survey (ISGS) by Series/Report "Bulletin no. 089"

  • Templeton, J.S.; Willman, H.B. (Champaign, Ill: Illinois State Geological Survey, Prairie Research Institute, 1963)
    The Champlainian (Middle Ordovician) rocks of Illinois consist of a large number of widely distributed rock-stratigraphic units, some of which have not been previously described. In this study many of the formations and ...


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