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  • Grassy Knob Chert
    |category6=Chert |tree2=Grassy Knob Chert
    3 KB (421 words) - 18:11, 11 January 2017
  • Clear Creek Chert
    |category6=Chert |tree2=Clear Creek Chert
    4 KB (574 words) - 18:06, 11 January 2017
  • Bailey Limestone
    ...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p. The Bailey is overlain conformably by the Grassy Knob Chert and in many localities is not readily differentiated from it (Weller et al.
    6 KB (837 words) - 21:25, 22 October 2019
  • Backbone Limestone
    ...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p. ...where only the upper 38 feet of the formation, overlain by the Clear Creek Chert, is exposed.
    3 KB (412 words) - 18:09, 11 January 2017
  • Lower Devonian Series
    ...ndbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p. ...Illinois are largely siliceous-- cherty, silty limestone and dolomite, and chert formations. They may have originally extended over all of Illinois, unless
    5 KB (647 words) - 18:05, 11 January 2017
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