Portland, Oregon, Geology by Tram, Train, and Foot by Ian P
Portland, Oregon, geology by tram, train, and foot by Ian P. Madin Oregon Department of Geology and Mineral Industries, 800 NE Oregon Street #28, Suite 965, Portland, Oregon 97232-2162 Overview: This field trip provides an introduction to the geology of the Portland, Oregon, area. Five field trip stops, all acc transportation and walks of easy to moderate difficulty, provide opportunities to see outcrops of Columbia River Basalt, Troutdale Forma- tion, Boring volcanic field flow and vents, Portland Hills Silt, and a small landslide. INTRODUCTION Residents of the Portland, Oregon, metropolitan area are proud of its scenery and its public transit system (also known as TriMet or MAX). Beneath both lies some fascinating geology, including Miocene flood basalt flows, Quaternary volcanoes, and deposits and landforms left by the great Bretz/Missoula Floods. This field trip provides an opportunity to see some of the geology of the Portland area by walking and using public transportation, starting from the Oregon Convention Center (777 NE Martin Luther King, Jr. Boulevard). A guided version of the trip will be offered during the October 2009 GSA meeting, but this guide is also intended for those who want to self-guide at their own convenience. Bus, streetcar, light rail, and tram fares can all be readily purchased at the Rose Garden Transit Center adjacent to the Oregon Conven- tion Center. provide a fun introduction to the geol- ogy of PortlandThis area. field Ittrip is notguide meant is intended to to be a definitive and comprehensive review of the subject. A list of references is provided at the end of this guide for those interested in more details.
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