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Reyes, Alberto Vicente

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Stratigraphic observations from sites in eastern Beringia - Ch'ijee's Bluff and nearby exposures in northern Yukon, the Palisades on the Yukon River in Alaska, and placer mining exposures at Thistle Creek in west-central Yukon - provide insight into the chronostratigraphic significance of Old Crow tephra (124 ± 10 ka) and permafrost response to warming during the last interglaciation. Pollen and insect, bryophyte, and vascular plant macrofossils from a vegetated surface buried by Old Crow tephra suggest the local presence of mesic tundra, wet meadow, and aquatic habitat when the tephra was deposited. A revised glass fission-track age for Old Crow tephra places its deposition closer to the time of the last interglaciation...
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