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Geology 103 Name: Assignment 6: Plate Tectonics and the Pacific Northwest Due: Wednesday, May 21 Go to the Northwest Origins page at the Burke Museum of Natural History and Culture site to answer the following questions. http://www.burkemuseum.org/static/geo_history_wa/index.htm 0. What are the authors’ names for these pages? When did they write it? 1. When the supercontinent Rodinia broke up, what kind of margin was western North America? How much of Washington was above sea level? What two rocks are evidence for this? 2. As the supercontinent Pangaea broke up, what kind of margin was western North America? Describe the tectonic interaction that was occurring here, and name the plates involved. 3. What is a “terrane”? Why are these important to the story of western North America? From oldest to youngest, what are the terrane names that build up Washington? What are the terranes made of? 4. In addition to terrane accretion, what other tectonic event happened during those accretionary periods? What rock still exists from this event? 5. Which of the four “episodes” described on the site fits the timing and lithology of the Eocene rocks of western Washington? 6. During that “episode”, what kind of tectonic interaction was going on in the Pacific Northwest? Name the plates involved.