Sandstone aquifers

GROUND WATER ATLAS of the UNITED STATES
Introduction and National Summary

Sandstone aquifers

Figure 20 Map showing the location of the Cambrian-Ordovician aquifer system
Figure 21 Correlation chart showing the geologic formations that comprise the Cambrian-Ordovician aquifer system
Figure 22 Map showing the top-of-aquifer contours of the Mount Simon aquifer
Figure 23 Map showing the movement of water through the St. Peter-Prairie du Chien-Jordan aquifer
Figure 24 Map showing water level decline in the Cambrian-Ordovician aquifer system
Figure 25 Hydrogeologic section showing flow of ground-water through the sandstone aquifers in southeastern Minnesota
Figure 26 Map showing the dissolved-solids concentrations in water from the St. Peter-Prairie du Chien-Jordan aquifer