Charley River tephra consists mostly of fine-grained pumiceous glass with a small amount of blocky, poorly vesicular glass. It is heavily contaminated with detrital minerals, but a few primary grains of feldspar, FeTi oxides, biotite, hornblende, orthopyroxene, and apatite were identified.
A catalogue of late Cenozoic tephra beds in the Klondike Goldfields and adjacent areas, Yukon Territory
Recurring middle Pleistocene outburst floods in east-central Alaska
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