Volcano List
About Alaska's Volcanoes Hazards from Alaska's Volcanoes
Map & Alphabetical List Interactive Map
Eruption Search Volcano Search
|
Text Description: Average composition of samples from Lone Spruce Pond (UA1963), Sunday Pond (UA1780), Little Swift Lake (Axford and Kaufman 2004) (UA1967), Waskey Lake (Levy et al. 2004) (UA1968), Arolik Lake (Kaufman et al. 2003) (UA1970), and subsamples from three levels in the soil pit near Cascade Lake (Kathan 2006) (UA1975, UA1976, UA1977). This tephra comprises the thickest bed in all lakes from the region (likely including Nimgun Lake, which was not analyzed and somewhat older than expected), and is essentially ubiquitous in outcrops and soil pits across the landscape. Tephra A contains a high percentage of bubble-wall and tricuspate shards, platy glass, elongate pumice, and pumice with large vesicles. Less common are blocky glass and pumice, which are occasionally crystal-rich. Brown and clear glass shards are present in roughly the same proportion. 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 |
This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G22AC00137
Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.
Operations
Response
Staff
Fields of Study
Geology
Color Code Definitions
Webcams
Webicorders
RSAM
Great Sitkin
Aniakchak
Glossary
Recent Images
Browse Images
