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“Buried and Submerged Forests of the Pacific Northwest”
“Buried and Submerged Forests of the Pacific Northwest”
WhenTuesday, July 30, 2019, 7 – 8:30 p.m.
WhereHaynes' Hall at McMenamins Anderson School, 18607 Bothell Way NE, Bothell, WA 98011

Patrick Pringle, Professor Emeritus of Earth Sciences, Centralia College

How much we know about the Pacific Northwest's post-Ice Age geologic events has grown rapidly in recent decades. The discovery and study of buried and submerged forests-Victims of past catastrophes, has opened the door to new understanding. Testing techniques such as Carbon 14 wiggle matching and dendrochronology (tree-ring dating) now allow more precise dating of the geological past as well. These capabilities are revolutionizing our understanding of the history, behavior, and effects of past volcanic eruptions, regional earthquakes, major landslides, and (to a limited extent) regional climate history and fluctuations.

We will take a snapshot tour of some of the many locations of buried and submerged forests around Washington State and other Pacific Northwest locations to observe trees that were submerged by postglacial tectonic forces, or killed by a flow of hot volcanic fragments (pyroclastic surge) or buried in landslides, or drowned in lakes dammed by landslides. On our tour we'll get a picture of the scale of some of the dramatic postglacial landscape changes, such as the episodic disturbances caused by volcanism-changes that the pre-Euro-American settlement peoples experienced and adapted to, and that early explorers, like Lewis and Clark, described vividly in their journals.

We'll see how samples of "subfossil" trees are collected and prepared for tree ring analysis, and learn about what tree rings in these "time capsules" can tell us. Some of the scenic areas we will visit include the Washington Coast, the Olympic and Cascade Mountains, the Puget Lowland, and the Columbia Gorge, with a special focus on the Bonneville landslide, and Mount Rainier and Mount Hood volcanoes.

The University of Washington Bothell is partnering with McMenamins History Department to present Pub Night Talks — a monthly series of talks by experts from UW Bothell and around the local community.

These talks are held the last Tuesday evening of each month at McMenamins Anderson School in downtown Bothell. Doors open at 6 pm. Talks begin at 7 p.m. and are followed by Q&A.

All talks are free and open to the public. All ages welcome!

All seating is first come, first served.

To learn about other events from the History Department of McMenamins, go to

UW Bothell Event typesLectures/Seminars
SpeakerPatrick Pringle, Professor Emeritus of Earth Sciences, Centralia College
Event sponsorsUW Bothell Office of Advancement & External Relation and McMenamins History Department
Event typesLectures/Seminars…
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