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WEBINAR: A Yachats Volcano? Understanding the Geology of Cape Perpetua Area

August 18, 2020 | 6:00 pm - 7:00 pm PDT

Why is there a rugged rocky coastline from Cape Perpetua to Heceta Head? To the north of Yachats there are long stretches of sandy beaches; to the south are the sandy beaches and dunes around Florence. This talk will answer the question by taking you back into deep time. You will learn about plate tectonics, Oregon’s long geologic history, and a volcano in Yachats that erupted and deposited hard, resistant basalt rock some 37 million years ago. Yachats is built on the remnants of this volcano. We will learn how the volcano was eroded and reshaped to create the rocky coastline we see today, including the Devil’s Churn, Spouting Horn, and Thor’s Well.


About the Speaker, David Muerdter, Geologist

David Muerdter grew up in San Diego near the beach and has never lived more than 50 miles away from salt water. Curiosity about the ocean and rocks led him to get a BS in Geology from Oregon State University and a PhD in Geological Oceanography from University of Rhode Island. During his studies he sailed on many oceanographic cruises to collect deep sea sediments. He served in the Peace Corps in Malaysia where he was a high school physics teacher and a geologist for the Geological Survey of Malaysia. He finally settled into a career as a geophysicist specializing in how sound moves through rocks, and he taught classes in this specialty around the world. Since retiring, he enjoys volunteering at the Seattle Aquarium and at the Cape Perpetua Visitors Center while visiting the central Oregon Coast in the summer. David always delights in exploring the world with his wife, Nancy, and captures as much of it as he can with his camera.



August 18, 2020
6:00 pm - 7:00 pm PDT
Event Category:


OR United States


Cape Perpetua Collaborative
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