Alaska Volcano Observatory

2-5 cm thick deposit. Clear to pale gray glass and fibrous white pumice; trace pale grey to medium brown scoriaceous glass; rare fine black fragments may be black glass shards; estimated 98% glass, remainder is plagioclase and pyroxene>amphibole>opaquesa=apatite=-zircon (?).

Sample Location:

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Legend

	Red (Warning)
	Orange (Watch)
	Yellow (Advisory)
	Green (Normal)
	Uninstrumented

100 km

50 mi

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References Cited

[1] The Aniakchak tephra deposit, a late Holocene marker horizon in western Alaska, 1987

Riehle, J. R., Meyer, C. E., Ager, T. A., Kaufman, D. S., and Ackerman, R. E., 1987, The Aniakchak tephra deposit, a late Holocene marker horizon in western Alaska: in Hamilton, T. D. and Galloway, J. P., (eds.), Geologic studies in Alaska by the U.S. Geological Survey during 1986, U.S. Geological Survey Circular C 0998, p. 19-22.

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