Volcanoes to Vineyards: Geologic Field Trips through the Dynamic Landscape of the Pacific Northwest
This volume contains guides for 33 geological field trips offered in conjunction with the October 2009 GSA Annual Meeting in Portland, Oregon. Showcasing the region’s geological diversity, the peer-reviewed papers included here span topics ranging from accreted terrains and mantle plumes to volcanoes, floods, and vineyard terroir. Locations visited throughout Oregon, Washington, and Idaho encompass Astoria to Zillah. More than just a series of maps, the accompanying descriptions, observations, and conclusions offer new insights to the geologic processes and history of the Pacific Northwest insights that will inspire readers to put their boots on the evidence (or perhaps sip it from a glass of Pinot!) as they develop their own understanding of this remarkable and dynamic corner of the world.
Landscape and hydrologic response in the Williamson River basin following the Holocene eruption of Mount Mazama, Cascade volcanic arc
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Published:January 01, 2009
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CiteCitation
Michael L. Cummings, Jeffrey S. Conaway, 2009. "Landscape and hydrologic response in the Williamson River basin following the Holocene eruption of Mount Mazama, Cascade volcanic arc", Volcanoes to Vineyards: Geologic Field Trips through the Dynamic Landscape of the Pacific Northwest, Jim E. O’Connor, Rebecca J. Dorsey, Ian P. Madin
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ABSTRACT
The field trip examines coupled hydrologic and landscape response after the cataclysmic eruption of Mount Mazama to form Crater Lake in the Cascade volcanic arc at ~7627 ± 150 cal. yr B.P. The Williamson River basin, east of Crater Lake and in the rain shadow of the Cascade Range, was buried beneath thick pumice and pyroclastic-flow deposits. The distinctive physical properties of pumice and volcanic ash affect the movement and retention of water and the ongoing evolution of the landscape. Three themes will be explored: (1) post-eruption transition from perched streams to losing streams along the eastern flank of the Cascade Range; (2) filling and catastrophic draining of a lake trapped behind a dam of pyroclastic flow deposits in the Williamson River canyon; and (3) post-eruption faulting and the hydrology of Klamath Marsh.
- canyons
- Cascade Range
- Cenozoic
- Crater Lake
- dams
- faults
- field trips
- guidebook
- Holocene
- hydrology
- igneous rocks
- Klamath County Oregon
- lakes
- landform evolution
- landscapes
- Mazama Ash
- Mount Mazama
- natural dams
- North America
- Oregon
- pumice
- pyroclastic flows
- pyroclastics
- Quaternary
- rivers and streams
- road log
- United States
- volcanic ash
- volcanic rocks
- Williamson River basin