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The ca. 8800 14 C yrs BP Sulphur Creek lava flowed eastward 12 km from the Schriebers Meadow cinder cone into the Baker River valley, on the southeast flank of Mount Baker volcano. The compositionally-zoned basaltic to basaltic andesite lava entered, crossed and partially filled the 2-km-wide and >100-m-deep early Holocene remnant of Glacial Lake Baker. The valley is now submerged beneath...
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