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Tualatin River Watershed
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Basalt -- Oregon -- Clackamas County
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Basalt -- Oregon -- Multnomah County
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Geology
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PDX Scholar
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Approximately 150 meters (500 feet) of Grande Ronde Basalt and 140 meters (450 feet) of Wanapum Basalt of the Columbia River Basalt Group are exposed in the Bull Run Watershed. In Bull Run, the Grande ...
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