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Dam Breaks and Alluvial Cycles, Pleasant Valley ... - NORFMA

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Regional Geology<br />

- Columbia River Basalts (CRBs)<br />

(17-14 million yr ago)<br />

- Yakima Fold Belt<br />

(age debated)<br />

- Missoula Floods deposits<br />

( ~15 thous<strong>and</strong> yr ago)<br />

- Loess deposition during <strong>and</strong> after<br />

glacial periods<br />

http://www.fs.fed.us/r6/columbia/forest/geology/<br />

INSERT PICTURES<br />

http://vulcan.wr.usgs.gov/Volcanoes/PacificNW/Maps/pacificNW_volcanics.html

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