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Geology of the Pacific Northwest

Second Edition

William N. Orr and Elizabeth L. Orr

The geologic history of the Pacific Northwest is as unique as the region itself. Created via tectonic plate movements and accretionary events, the original terranes were subsequently covered by sedimentary layers, ash, lavas, and glacial debris. These processes, begun millions of years ago, continue to affect the area, as seen in the eruption of Mount St. Helens and catastrophic Japanese tsunamis created by earthquakes in the Pacific Northwest. Understanding of the region’s geology has led to new insight in volcanic eruption prediction, disaster preparedness, the environmental effects of mining, and urban development as it relates to geologic hazards.

The Orrs’ detailed and informative writing style appeals to those with geologic training as well as beginners with an interest in the region. Each chapter covers a specific subregion, allowing for maximum flexibility both in the classroom and for the casual reader. The authors’ central theme that continental plate tectonics are the fundamental processes of Northwest geologic history permeates throughout the book.

$47.95 list, 337 pages

10-digit ISBN: 1-57766-480-9

13-digit ISBN: 978-1-57766-480-2

1. Cornerstones of Pacific Northwest Geology

2. Omineca-Intermontane Province

3. Insular and Coast Range of British Columbia and Alaska

4. Cascade Mountains

5. Klamath Mountains

6. Blue Mountains

7. Central Idaho

8. Snake River Plain and Owyhee Uplands

9. Basin and Range

10. Columbia River Plateau

11. Coast Province of Oregon and Washington

Glossary