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  2. Portal:Oregon/Selected article - Wikipedia

    en.wikipedia.org/wiki/Portal:Oregon/Selected_article

    The bedrock under the watershed includes part of the last exotic terrane, a chain of seamounts, acquired by the North American Plate as it moved west during the Eocene. Known as the Waverly Hills Formation, it lies buried under ash and lava from later volcanic eruptions, sediments from flooding and erosion, and layers of wind-blown silt.