GROUND WATER ATLAS of the UNITED STATES
Iowa, Michigan, Minnesota, Wisconsin
HA 730-J

Cambrian-Ordovician aquifer system

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Hydrogeologic Units


Maquoketa Confining Unit

Figure 99 Map showing location of Maquoketa confining unit (242K)
downloadable tiff file J099.tif.gz (2.4MB compressed)


Figure 100 Correlation chart providing information about the Maquoketa and St. Lawrence-Franconia confining units and the St. Peter-Prairie du Chien-Jordan aquifer (301K)
downloadable tiff file J100.tif.gz (2.8MB compressed)


St. Peter-Prairie du Chien-Jordan Aquifer

Figure 101 Map showing location of the St. Peter-Prairie du Chien-Jordan aquifer (245K)
downloadable tiff file J101.tif.gz (2.1MB compressed)


Figure 102 Map showing location of the St. Peter Sandstone (261K)
downloadable tiff file J102.tif.gz (2.4MB compressed)


Figure 103 Photograph showing an example of St. Peter Sandstone (273K)
downloadable tiff file J103.tif.gz (2.3MB compressed)

Figure 104 Map showing stratigraphic units on which the St. Peter Sandstone was deposited (282K)
downloadable tiff file J104.tif.gz (2.5MB compressed)


Figure 105 Map showing thickness of the St. Peter Sandstone (254K)
downloadable tiff file J105.tif.gz (2.2MB compressed)

Figure 106 Photograph showing dolomite from the Prairie du Chien Group (228K)
downloadable tiff file J106.tif.gz (1.7MB compressed)


Figure 107 Map showing location if the Prairie du Chien Group (257K)
downloadable tiff file J107.tif.gz (1.9MB compressed)

Figure 108 Map showing location of the Jordan Sandstone (200K)
downloadable tiff file J108.tif.gz (1.6MB compressed)


Figure 109 Map showing thickness of the Jordan Sandstone (323K)
downloadable tiff file J109.tif.gz (2.7MB compressed)

St. Lawrence-Franconia Confining Unit

Figure 110 Correlation chart providing information about the St. Lawrence-Franconia and Eau Claire confining units and the Ironton-Galesville aquifer (149K)
downloadable tiff file J110.tif.gz (1MB compressed)

Ironton-Galesville Aquifer

Figure 111 Map showing location if the Ironton-Galesville aquifer (294K)
downloadable tiff file J111.tif.gz (2.6MB compressed)


Figure 112 Generalized vertical section across the Hollandale Embayment showing placement of the Ironton-Galesville aquifer (226K)
downloadable tiff file J112.tif.gz (1.8MB compressed)

Eau Claire Confining Unit

Mount Simon Aquifer

Figure 113 Correlation chart providing information about the Eau Claire confining unit and the Mount Simon and crystalline-rock aquifers (177K)
downloadable tiff file J113.tif.gz (1.2MB compressed)


Figure 114 Map showing location if the Mount Simon Aquifer (535K)
downloadable tiff file J114.tif.gz (4.3MB compressed)

Figure 115 Map showing thickness of the Mount Simon Aquifer (292K)
downloadable tiff file J115.tif.gz (2.6MB compressed)

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