Prairie Research Institute
University of Illinois at Urbana-Champaign
INRS State Scientific Surveys
Illinois Natural History Survey
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Illinois State Archaeological Survey
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Illinois State Geological Survey
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Illinois State Water Survey
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Illinois Sustainable Technology Center
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Lake County
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Quaternary
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Maquoketa Formation
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Silurian
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Galena-Platteville Interval
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Ancell Formation
Ironton-Galesville
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Eau Claire Formation
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Mt. Simon Sandstone
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Cross Sections
Stratigraphic Column Showing Materials in Lake County, Illinois
Updated 10/27/2009
SLD