Portland Oregon Geologic Field Trip

While looking for information on “splines”, I stumbled over an interesting article in the Community Resources section of the Resources Tab for the Geology Department of Portland State University. The pdf file is a Self-guided tour of Portland, Oregon’s geology. This field trip provides an introduction to the geology of the Portland, Oregon, area. Five field trip stops, all accessible by public transportation and walks of easy to moderate difficulty, provide opportunities to see outcrops of Columbia River Basalt, Troutdale Formation, Boring volcanic field flow and vents, Portland Hills Silt, and a small landslide. I have never had a chance to visit the Northwest but might like to some day. This paper is an exciting chance to visit the neighborhood of Mt. St. Helens vicariously. And a way to spend a day or two out and about in the Portland area.

Also exciting is the description of the floods in the Portland area on 20-15 thousand years ago. Water levels 150m higher than current sea level! What short memories humans have. Maybe the geologists should buy the climatologists a cup of coffee and fill them in on life on earth.

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