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Geological Survey Scientific Investigations

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Maps -- Oregon -- Geology


This geologic map encompasses the greater Portland metropolitan area (the metro area), an urbanized region astride the confluence of the Willamette and Columbia Rivers in Oregon and Washington. The metro area includes the Portland-VancouverHillsboro metropolitan area, defined by the U.S. Census as the 23rd largest such area in the U.S., having a population of more than 2.2 million people ( The map area extends beyond the urbanized core to include outlying towns and cities and the bounding fault zones that separate the metro area from the adjacent Coast Range and Cascade Range (or Cascades; figs. 1, 2, and 3). The metro area is an area of great scenic, natural, and cultural resources and is the major economic hub of Oregon, containing nearly half of the state’s population and generating 75 percent of its gross domestic product (


This article is a US Government work and is in the public domain in the United States of America.

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