In 1987 , Dr. Brian F. Atwater , a geologist with the United States Geological Survey , discovered near the mouth of the Columbia River and in several other estuaries in Washington the scars of a large tsunami , including spruce tree forests that had suddenly turned into salt water tidal flats when the land elevation dropped several feet . ''
Washington /location/location/contains Columbia River
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Washington
LOCATION
Columbia River
LOCATION
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