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Text Description: Average composition of samples from Lone Spruce Pond (UA1786), Sunday Pond (UA1796=2003), Little Swift Lake (Axford and Kaufman 2004) (UA1794), Waskey Lake (1788), Arolik Lake (Kaufman et al. 2003) (UA1969), Cascade Lake (Kathan 2006) (UA1972), and Sunday Lake (UA1792). Along with Tephra A, Tephra B of the Ahklun Mountains is the most widespread of all of the regional tephra beds. Tephra B is predominantly blocky glass and pumice, with rare bubble-walled shards and large vesicular pumice. Many of the glass shards are crystal-rich, containing microcrysts of plagioclase and pyroxene. The glass tends to be various shades of brown, with rare clear glass. References:  Late glacial and Holocene glacier and vegetation fluctuations at Little Swift Lake, Southwestern Alaska, U.S.A. Late Quaternary tephrostratigraphy, Ahklun Mountains, SW Alaska A 33,000 year record of environmental change from Arolik Lake, Ahklun Mountains, Alaska Late Holocene climate fluctuations at Cascade Lake, northeastern Ahklun Mountains, southwestern Alaska Holocene glacier fluctuations, Waskey Lake, northeastern Ahklun Mountains, southwestern Alaska |
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