Basaltic- and other volcanic-rock aquifers

GROUND WATER ATLAS of the UNITED STATES
Introduction and National Summary

Basaltic- and other volcanic-rock aquifers

Figure 40 Photograph showing pillow basalt
Figure 41 Photograph and diagram showing zones of varying permeability in a typical basalt flow
Figure 42 Map showing the location of the Snake River Plain regional aquifer system in southern Idaho and southeastern Oregon
Figure 43 Diagrammatic section showing the geologic structure of the Snake River Plain
Figure 44 Map showing the saturated thickness of Pliocene and younger basaltic rocks in the Snake River Plain
Figure 45 Diagrammatic section showing the formation of basaltic lava flows in southern Idaho
Figure 46 Map showing the regional movement of water in the Snake River Plain