by Scott Petersen
Washington Park Rocks, Fidalgo Island by Ivar & Phyllis Dolph
Tuesday, October 13, 2015
7:00 Social; 7:30 Program
Padilla Bay Interpretive Center
10441 Bayview-Edison Road
Mt. Vernon, Washington
Most people that observe rocks on Fidalgo Island focus on the glacial features at Washington Park, Cap Sante, and Mt Erie. Much more interesting are the rocks themselves. They were formed in the Pacific Ocean about 190 million years ago, transported here from afar over many millions of years, and only lately shaped during the last iceage. The island’s rocks tell a story\of volcanism, faulting and sedimentation in the deep ocean and near the North American continent. We will discuss the origin and odyssey of these rocks with respect to plate tectonics, how they relate to the rest of the San Juan Islands and the North Cascades, and where you can see some of the most significant rock types on the island.
Scott Petersen is a geologist with 35 years of experience in research, education, and environmental remediation. He holds a Ph.D. in geology and geochemistry, and is a licensed geologist and hydrogeologist in Washington State. Retired and living on Fidalgo Island, Scott is a member of the Beach Watcher class of 2012. He has been active in forage fish surveys and several other ‘citizen science’ projects.