An interesting fact about Oregon is that while the western half experiences heavy rainfall each year, the eastern half is high-desert country. The chain of magnificent towering volcanic peaks that makes up the Cascade Range separates the state into these two extremes. Another fact; before the Cascades first formed (there are actually two different sets), Oregon was a tropical paradise! Go exploring and learn more about Oregon´s geology!

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Graphic by Elizabeth L. Orr, Geology of Oregon,
available from Nature of the Northwest

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Page updated: May 03, 2007

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State of Oregon

Learn More About Oregon's Geology DOGAMI Index

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