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

Volcanic- and sedimentary-rock aquifers

(figures 38-41)

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Volcanic- and sedimentary-rock aquifers (Click to view thumbnails and download figures)

• Figure 38 Map showing location of volcanic- and sedimentary-rock
• Figure 39 Diagram showing relationship between density and permeability of fractures
• Figure 40 Photograph showing fractures in silicic volcanic rocks
• Figure 41 Photograph showing springs issuing from silicic volcanic rocks

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