HA 730-H Pliocene and younger basaltic-rock aquifers

GROUND WATER ATLAS of the UNITED STATES
Idaho, Oregon, Washington
HA 730-H

Pliocene and younger basaltic-rock aquifers

Figure 26 Map showing location of Pliocene and younger basaltic-rock aquifers
Figure 27 Cross section showing lava flows
Figure 28 Photograph of eastern Snake River Plain
Figure 29 Photograph showing contrast between land barren by basaltic lava flows vs. cultivated land on layer of thick soil
Figure 30 Photograph of pillow basalt
Figure 31 Photograph of basaltic rock core samples
Figure 32 Photograph of basaltic rock showing layers of permeability
Figure 33 Diagram of wells drilled into basalt
Figure 34 Photograph showing layers of fine-grained, unconsolidated deposits between interflow zones
Figure 35 Diagram showing formation of interflow zones
Figure 36 Diagram showing wells completed in Pliocene and younger basaltic-rock aquifers
Figure 37 Chart showing effect of atmospheric pressure changes on well-water levels