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USGS Groundwater Information

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Principal aquifer

Color bar in aquifer map color

Aquifer Links

Principal Aquifers Map

Ground Water Atlas

USGS Groundwater Data

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Water Resources

Groundwater Information

Aquifer Basics Links

list of aquifers


 Cambrian-Ordovician aquifer system


Map of aquifer system including underground extent.

Description and map of sandstone aquifers.

Publication sources

  • Olcott, P.O., 1992, Ground Water Atlas of the United States, Segment 9-Iowa, Michigan, Minnesota, Wisconsin: U.S. Geological Survey Hydrologic Investigations Atlas 730-J, 31 p.(see Cambrian-Ordovician aquifer system)
  • Batten, W.G., and others, 1997, Rock-stratigraphic nomenclature, lithology, and subcrop area of the Galena-Plateville bedrock unit in Illinois and Wisconsin: U.S. Geological Survey Water Resources Investigations Report 97-4054-B, 1 sheet

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Page Last Modified: Tuesday, 14-Apr-2015 14:19:58 EDT