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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

USGS Links

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: Thursday, 08-Dec-2016 13:40:58 EST