Geologic Publications for Mount Rainier

Field-trip guide to subaqueous volcaniclastic facies in the Ancestral Cascades arc in southern Washington State - The Ohanapecosh Formation and Wildcat Creek beds

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Author(s): Martin Jutzeler, Jocelyn McPhie

Category: PUBLICATION
Document Type: Scientific Investigations Report 2017-5022-B
Publisher: United States Geological Survey
Published Year: 2017
Volume:
Number:
Pages: 24
DOI Identifier: 10.3133/sir20175022B
ISBN Identifier:
Keywords:

Abstract:
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.

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Suggested Citations:
In Text Citation:
Jutzeler and McPhie (2017) or (Jutzeler and McPhie, 2017)

References Citation:
Jutzeler, M. and J. McPhie, 2017, Field-trip guide to subaqueous volcaniclastic facies in the Ancestral Cascades arc in southern Washington State - The Ohanapecosh Formation and Wildcat Creek beds: Scientific Investigations Report 2017-5022-B, United States Geological Survey, 24 p., doi: 10.3133/sir20175022B.