TIL That the Olympic Peninsula Used to be an ancient island called Siletzia that collided with North America. It was born from the same hot spot that is today the Yellowstone Super Volcano.
Even though there are no volcanoes on the Olympic Peninsula, you can find lots of volcanic rocks on the beaches. This bizarre circumstance might have to do with how the ancient island transformed Washington state.
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Nick Zentner of Central Washington University is the guy to watch on YouTube for PNW geology.
Here's a longer lecture about Siletzia: https://www.youtube.com/watch?v=nWS9XzW4BHs
Then there's this video, mainly about the Rocky Mountains, but which helps to situate Siletzia in the geologic history of North America: https://www.youtube.com/watch?v=I9Xk1O17dzg