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W., 2001, Low-delta (super 18) O tephra from a compositionally zoned magma body: Fisher Caldera, Unimak Island, Aleutians: Journal of Volcanology and Geothermal Research, v.

website with links to data and index map Westgate, J. J., Kotler, Erica, and Hall, Sheila, 2000, Dawson Tephra: a prominent stratigraphic marker of late Wisconsinan age in west-central Yukon, Canada: Canadian Journal of Earth Sciences, v.

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R., 1982, Two new tephra localities in the Yukon-Tanana Upland: in Coonrad, W.

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W., 1975, Submarine geology of volcanic ash deposits: stratigraphy, age, and magmatic composition of Hawaiian and Aleutian tephra: Eocene to recent: Columbia University unpublished Ph.

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