Based on the February 14, 2020 lecture by Dr. Marli Miller, Department of Earth Sciences, University of Oregon and her book co-authored with Dr. Darrel Cowan.

GSOC members were delighted to welcome back Dr. Marli Miller to speak to the society about her latest book, Roadside Geology of Washington Second Edition. Miller co-wrote the book with her former PhD. Thesis advisor, Dr. Darrel Cowan of the University of Washington, whose experience and perspective in understanding the geological framework of the state was invaluable. In her opening remarks, she said that her favorite thing to say about writing these (roadside geology) books is that she learns so much.

In her lecture Miller broke down the geological history of Washington into a series of events, which define the physiographic provinces of the state, because it is the bedrock of a region that influences the outward appearance. The original western boundary, the Laurentian margin, is now on the eastern margin of Washington, and these ancient rocks are highly deformed and metamorphosed to varying degrees. A series of accreted terranes, starting with the Quesnellia terrane accreted in the Jurassic, and the latest Siletzia, which stretches from southern Oregon to southwestern British Columbia, and which accreted 50 million years ago, comprise the basement for the remaining part of the state. Atop and within these lie volcanic and sedimentary bodies that covered or erupted through the basement rocks. Stitching plutons were igneous masses that erupted as a result of terranes accreting to each other or to the continent.

Based on the January 10, 2020 GSOC Friday night lecture by Dr. Laird Thompson, Managing Partner of UF3.

Dr. Laird Thompson is an expert on rock fracturing and after working on imaging technology for boreholes in the 1980’s, he was appointed head of Mobil Oil’s fracture technology. He owns his own consulting firm now and is currently partnering on some work which has brought him into Oregon -- where GSOC is fortunate to have him as a speaker. He is the author or coauthor of several reference books which are the standards for the fracking* industry.

*See discussion below about whether it should be spelled “fracking” or “fracing.”

In explaining the rise and importance of fracking, Thompson reviewed the natural, financial and geopolitical history of the oil industry. Oil** is a commodity whose value is shaped by the laws of supply and demand. It is a commodity that is limited in supply. For the most part, it was created from biomass, which on earth is concentrated in the ocean in the form of diatoms, plankton, etc. These little oceanic critters have died by the trillions, and the little drops of oil they used as ballast have turned into oil reserves over millions of years.

Download pdf of Laird Thompson’s January lecture.

This article is going to be a bit of a departure from the typical GSOC Friday night lecture synopsis, because there is an online video version of the “Supervolcanoes” lecture available on Nick Zentner’s web page. However, the GSOC lecture itself was a happening due to the popularity of Zentner’s video productions, and there were some wrinkles in the Supervolcanoes lecture that he did specifically for our group that are worth noting. To begin the lecture, Zentner talked about his inspiration for doing the topic of Supervolcanoes in the Pacific Northwest.

Synopsis of the GSOC Friday night lecture given on June 8, 2019, with speaker Dr. John Armentrout

Dr. John Armentrout gave a fascinating lecture on his work on the Coaledo project, a multidisciplinary team effort to revisit the geology of Oregon’s Coos Bay area. The study area is covering the Cape Arago peninsula, from the mouth of Coos Bay to Sacchi Beach. The eighteen researchers involved in the project — specialists in geologic structure and stratigraphy, tectonics and paleomagnetics, sedimentology, and paleontology — will be updating tectonic and depositional history of the area to improve understanding at both the local and global levels of interest. 

Synopsis of the GSOC Friday night lecture given on April 12, 2019, with speaker Jon Krier, MS from OSU.

Jon Krier’s work seeks to conduct ancient shoreline mapping in order to find possible locations of submerged archaeology sites along the western coast of North America. He combines modern bathymetry and other technological techniques to assess underwater contours with the oral traditions of indigenous tribes in his work. Krier has recently been involved in a project along the Oregon coast for the Confederated Tribes of the Grand Ronde. The tribes’ objective in hiring the study was to determine where ancient settlements may be located on the submerged coast in anticipation of energy companies coming in to the area. They are having Krier predict where cultural resource assessments need to be done prior to any disturbances.

The title of this article is the ‘alternative title’ shown to us by Dr. Ian Madin, the speaker featured at the GSOC 84th Annual Banquet on March 10. Madin came to describe three new areas of Oregon containing active faults that were discovered by analyzing the ‘bare earth’ maps of the ground produced in LiDAR scans of the terrain The first area of faults described by Madin are located in the Mt. Hood area, and are referred to as the Mt. Hood Fault Zone. These faults run north to south and are normal faults. Two of the faults, Multorpor Mountain Fault and Twin Lakes Fault, define two sides of a graben that is 10 miles long. Madin also analyzed the potential earthquake hazards represented by the faults.