Slip Sliding Away - a recap/field guide of the Landslides of Portland's Tualatin Mountains Field Trip

Slip Sliding Away - a recap/field guide of the Landslides of Portland's Tualatin Mountains Field Trip

September 28, 2024

A significant portion of the terrain of Portland’s West Hills between Burnside Road and US 26 is ancient and active landslides. Dr. Scott Burns, professor emeritus of Geology at Portland State University, took GSOC participants on a field trip exploring this terrain and observing the mitigation methods used over the years to try and arrest the sliding and damage. Dr. Burns has trained quite a few geologists about landslides over the years he has taught at PSU, and many of his students are now cataloguing and mitigating landslides throughout the Pacific northwest and other areas of the country.

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Episodes of Death and Destruction - a recap of the Wasco County Geology Field Trip

Episodes of Death and Destruction - a recap of the Wasco County Geology Field Trip

June 7-9, 2024

In the June 2024 field trip, GSOC participants were treated to explore some of the geological fieldwork and mapping done by Jason McClaughry and field trip leader and GSOC Past President Clark Niewendorp of DOGAMI over the years 2014-2020. The main subject of the field trip was volcanic materials that originated in the Mt. Hood area of the High Cascades and were deposited on the eastern flanks of these mountains in Wasco County between The Dalles and Tygh Valley from the Late Miocene onwards. All this volcanic material is underlain by a platform of Columbia River Basalt. Also, the group examined the effects of folding and faulting associated with the Yakima Fold and Thrust Belt. Late Pleistocene surficial deposits – notably wind-blown loess and megaflood sediments – completed the surface geology they saw in the area.

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GSOC Crowd Enjoyed the Annual Picnic at Beacon Rock SP

GSOC Crowd Enjoyed the Annual Picnic at Beacon Rock SP

The GSOC Annual Picnic enjoyed a good turnout this year at Beacon Rock State Park in the Columbia River Gorge. GSOC had not sited the picnic here for over 20 years, and members agreed that this was a very good venue for a picnic. Not only did the site have a serviceable enclosed shelter building, but also a great view of some outstanding geology – Beacon Rock, a remnant of the last known outpouring of Boring lava, dated at 58,000 years ago.

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The Big Kapow! Crater Lake Field Trip Recap

The Big Kapow! Crater Lake Field Trip Recap

This trip began in the mind of GSOC member Dr. Benjamin Sloan after he joined the society last year and participated in the Coaledo trip last summer. By September he was emailing me and asking whether we would consider doing a trip to Crater Lake. I replied that we’d consider the trip, then added a long list of logistical considerations that needed to be worked out, thinking that would be the last I’d hear from him. Well, one month later he had researched the technical papers, gone to Crater Lake to research lodging and travel routes, and sent me a list of tasks he’d completed. Turns out that Ben has been planning field trips worldwide and teaching geology for years as well as doing oil exploration.

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GSOC Strawberry Mountain Field Trip

GSOC Strawberry Mountain Field Trip

story text by Carole Miles

photos by Carole Miles, Denny Chamberlin, and Kate Ely

The Strawberry Mountain fault was discovered in 2019 by DOGAMI’s Ian Madin upon reviewing new LiDAR maps of the area. Andrew Dunning, looking for a project for his master’s thesis at Portland State University, realized that a lack of high-quality seismic data in this area of Oregon may have erroneously led to an inaccurate assessment of the seismic risk in Eastern Oregon on the USGS National Seismic Hazard Map. He has been working on gathering data related to timing and offset of the Strawberry Mountain fault for the past two years. He was excited to take GSOC members into the field to show us what he has learned.

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Willamette East Bank Bike Geotour Recap and DIY Field Trip

Willamette East Bank Bike Geotour Recap and DIY Field Trip

Recap of the GSOC Willamette East Bank Bike Geotour - June 26, 2022

GSOC participants of the 3rd Eastbank Bike Geotour field trip met on the morning of Sunday, June 26, in order to complete the tour before the 90+ degree temperatures of the hottest day of the year (so far) set in. This tour had not been run in three years due to the pandemic, and the leaders included Ian Madin, who just retired from DOGAMI, and Dr. Lalo Guerrero, who teaches geology at Portland Community College. Take a journey with the group and think about biking it for yourself!

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Fluvial Processes in the Willamette Valley

Fluvial Processes in the Willamette Valley

Recap of the GSOC Willamette Valley Transect Geotour - June 18, 2022

Thirteen happy participants of 2022’s first GSOC field trip piled into the back room of the Bear Creek Pizza parlor in Molalla this past Saturday night to eat dinner and sketch up their conclusions from the day’s journey across the Willamette Valley. GSOC Past President and Programming Director Sheila Alfsen led the group from Erratic Rock State Park on the west side of the valley to the Molalla Rosette to the east of the valley in more or less a straight line. The purpose of the trip was to observe the landforms of the Willamette Valley, concentrating on the fluvial processes at work in the sediments of the valley floor.

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Recap of the Coaledo Formation Field Trip

Recap of the Coaledo Formation Field Trip

The Coaledo Formation field trip began about two years ago when Dr. John Armentrout, a native Oregonian and sedimentary basin stratigrapher with a long career at Mobil Oil, came to talk to GSOC about a project he was working on. He was revisiting a part of Oregon that he had studied in the early days of his career, the Coaledo Formation centered in the Coos Bay and Cape Arago areas. He had assembled a team of researchers from the University of Oregon and elsewhere to work on the multidisciplinary project. And he proposed the GSOC field trip as a precursor to a GSA field trip he would be organizing for the GSA annual meeting in 2021.

So, we were all preparing to go on the trip in August 2020 and then COVID struck. We subsequently revised the trip date and finally this year got the trip ready to go. It turned out to be quite a fun trip and well worth the wait!

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Eastern Oregon Volcanics Trip Remembered

Eastern Oregon Volcanics Trip Remembered

With forecasts in the Willamette Valley due to surpass 115 degrees, suddenly a four-day geology field trip in traditionally hot Central Oregon seemed to be a very cool place to visit indeed! So, off to the (relatively) cool hills and mountains surrounding Prineville and John Day did 25 geologists and geologist-wanna-be’s travel. Led deftly by three intrepid women: Carol Hasenberg (primary trip organizer), Carrie Gordon (Day 1 & Day 4 Geologist) and Emily Cahoon (Day 2, 3 & 4 Geologist), the group caravanned in up to 14-vehicles to incredibly important and fascinating geologic formations that only friends-of-rocks and aficionados-of-prevailing-geologic theory would appreciate!

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DIY Geology Trip to Eastern/Central Washington State

DIY Geology Trip to Eastern/Central Washington State

by Carol Hasenberg

What do you do when you can’t go on a GSOC field trip?!? Well, my husband John and I have been watching Nick Zentner do his video thing all spring and summer on YouTube, and we really wanted to see some of the features of Washington state that have been highlighted on the series. So, we decided to go ourselves to eastern and central Washington and see some of this geology. This article is an interactive travelogue of that adventure!

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Floral Notes From the GSOC Wallowa Field Trip

Floral Notes From the GSOC Wallowa Field Trip

by Teresa Meyer

For those of us who were fortunate enough to participate in the Wallowa GSOC field trip, along with stunning geology we were immersed in an abundance of wildflowers. We were surrounded by an unbelievable variety of wildflowers everywhere we went. At any one time you could stand still and see more than a dozen or more different flowers surrounding you.

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Tyee Country and Marys Peak Trip

Tyee Country and Marys Peak Trip

GSOC participants had a great little trip to the Corvallis area in mid-July to observe the geological features of Marys Peak and the Tyee formation along US 20 between Philomath and Newport, Oregon. Sheila Alfsen led the group on Saturday, July 13, on a tour of Marys Peak. Her tour was partially based on the very excellent book by Robert J. Lillie, Oregon’s Island in the Sky: Geology Road Guide to Marys Peak. This book is available online at a very reasonable cost.

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Wallowas Field Trip with Ellen Morris Bishop

Wallowas Field Trip with Ellen Morris Bishop

I’ll begin this article with a picture of the Buckhorn Overlook taken on May 18, 2019, when Evelyn, Julia and I did the reconnaissance for the Wallowa trip. We were directed up here by guest field trip leader Ellen Morris Bishop as this is the best overlook of the eastern canyons area for observing the ranks upon ranks of Columbia River Basalt flows that override the exotic terrane rocks of Hells Canyon, Imnaha Canyon and the Zumwalt Prairie through which we had travelled to get there. We are actually looking down into Imnaha Canyon here and Hells Canyon is just over on the other side of the last green ridge you can see. The blue ridge beyond is the eastern wall of Hells Canyon.

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Fond Memories of Our Recent Camp Hancock and John Day Basin Field Trip

Fond Memories of Our Recent Camp Hancock and John Day Basin Field Trip

This past President’s field trip organized by GSOC President Paul Edison-Lahm was representative of the best that GSOC has to offer its members – world class geology, knowledgeable speakers, activities for active and less robust participants, fellowship within our group and other science-oriented society members, ground-breaking club history (past and present), breathtaking scenery, great weather, and just plain fun! Special thanks to Paul for his hard work!

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Helicopter Trip to Mt. St. Helens

Helicopter Trip to Mt. St. Helens

A small party of GSOC members braved the iffy weather on September 9, 2017, to take a new view of Mt. St. Helens, aboard a helicopter owned and piloted by Hillsboro Aviation Company, on a trip of geologic discovery organized by Sheila Alfsen. The flight was launched from North Fork Survivors tourist complex on Spirit Lake Highway east of Toutle, Washington.

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Mt. Hood field trip

Mt. Hood field trip

Larry Purchase writes about our recent amazing GSOC Mt. Hood field trip "My thanks to all who contributed, especially..."

  • Janet for her firm Presidential direction: "No Matter What! Don't Cancel!"
  • Ellen for naming the flowers and appreciating the hydrology of the White River stream flow.
  • The Smoody Family for reconnoitering the area for years.
  • Julia for taking such great photos. Wrecking yard junk at the bottom of the Parkdale Lave Flow?
  • The park rangers for warmly welcoming us and giving us a wonderful tour of the Cloud Cap Inn.
  • Eric & Paul for organizing a last minute car load of participants.
  • Most of all to Bo! — for devoting so much time and energy in researching the geology and preparing such a concise, to the point, field trip guide.
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Jan and Janet Discover Mima Mounds from Google Earth Image

Jan and Janet Discover Mima Mounds from Google Earth Image

President Janet's SE Oregon Scouting Trip (Take Two)

On Monday, June 1, Jan Kessler and I headed down to SE Oregon to scout my field trip stops for the September GSOC trip. My husband Doug and I did a preliminary trip last August.

We had Marli Miller's new Roadside Geology of Oregon with us so the navigator could read aloud from it as we travelled. It was very helpful. We stopped at Glass Buttes off Hwy 20 between Bend and Burns. Neither of us had been there before. The turnoff is on the south side of the highway, just west of milepost 77. Look for a cattle guard. I was disappointed that it wasn't a sparkling glass mountain as I had imagined.

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