NEW GEOLOGIC MAPPING IN THE TENALQUOT PRAIRIE AND VAIL QUADRANGLES, WASHINGTON, INDICATES THAT CASCADE ARC VOLCANISM STARTED ABOUT 46 MA, ASSOCIATED VOLCANIC DEPOSITS LIKELY FILLED AN EOCENE FAULT-BOUNDED TACOMA BASIN NORTHEAST OF THE OLYMPIA STRUCTURE, PRE-VASHON DEPOSITS HERE EXTEND SEVERAL KILOMETERS FARTHER SOUTH THAN VASHON DEPOSITS, AND HIGH-VOLUME MELTWATER DISCHARGE MARKED THE GLACIAL ICE MARGIN
2021
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