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Subaqueous volcaniclastic facies in the ancestral Cascades Arc in Southern Washington State—The Ohanapecosh Formation and Wildcat Creek Beds


Jutzeler, M and McPhie, J, Subaqueous volcaniclastic facies in the ancestral Cascades Arc in Southern Washington State The Ohanapecosh Formation and Wildcat Creek Beds, U.S. Geological Survey, Reston, Virginia: 2017, US Department of the Interior; US Geological Survey, United States, Report 2017-5022-B (2017) [Government or Industry Research]

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DOI: doi:10.3133/sir20175022B


Partly situated in the idyllic Mount Rainier National Park, this field trip visits exceptional examples of Oligocene subaqueous volcaniclastic successions in continental basins adjacent to the Ancestral Cascades arc. The >800-m-thick Ohanapecosh Formation (32–26 Ma) and the >300-m-thick Wildcat Creek (27 Ma) beds record similar sedimentation processes from various volcanic sources. Both show evidence of below wave-base deposition, and voluminous accumulation of volcaniclastic facies from subaqueous density currents and suspension settling. Eruption-fed facies include deposits from pyroclastic flows that crossed the shoreline, from tephra fallout over water, and from probable Surtseyan eruptions, whereas re-sedimented facies comprise subaqueous density currents and debris flow deposits.

Item Details

Item Type:Government or Industry Research
Keywords:Ancestral Cascades, field guide, volcaniclastic, lacustrine
Research Division:Earth Sciences
Research Group:Geology
Research Field:Volcanology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Jutzeler, M (Dr Martin Jutzeler)
UTAS Author:McPhie, J (Professor Jocelyn McPhie)
ID Code:116592
Year Published:2017
Deposited By:Earth Sciences
Deposited On:2017-05-15
Last Modified:2017-05-15
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