GI tephra occurs at site B approximately 8 m above the newly identified Charley River tephra that is also present at site A. GI tephra consists mostly of colorless, bubble-wall glass shards with some brown glass and pumice fragments. Mineral grains, which are sparse, include feldspar, apatite, and orthopyroxene.
Recurring middle Pleistocene outburst floods in east-central Alaska
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