"The Pacific Northwest owes much of its scenic beauty to almost unimaginable geologic activity, from moving tectonic plates and volcanic eruptions to retreating glaciers. The San Juan Islands were created when glaciers advanced out of Canada and filled Puget Sound with an estimated 2,383 cubic miles of ice. As the glaciers retreated, the melting ice formed a huge freshwater lake in Puget Sound where glacial till mixed with marine sediments. The retreating glaciers carved deep channels through these sediments. This activity resulted in ancient mountain tops becoming the islands. Today’s beaches are awash with a variety of rocks smoothed through the ages."
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