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Sample: 87-APH

Sample ID: 87-APH [1] [2] [3]
Station ID: 87-APH
AT Num:
Volcano:
Possible source:
Eruption: Old Crow Tephra
Collector: Beget, J. E.
Date sampled:
Sample type 1: Tephra Fall
Color: Whitish
Final unit:
Text Description: 5 to 20-cm-thick volcanic ash layer extending for more than 40 m across the central cliff face. The tephra lies 15 to 20 m below the top of the cliff and about 4 to 5 m below a prominent organic horizon that could also be traced across much of the cliff face. The tephra itself is cross-bedded, and may also have been slightly reworked, although it forms a subhorizontal and essentially continuous horizon as much as 20 cm thick, and occurs in homogeneous silts (see Figure 3 in Beget et al. 1991). The layer of tephra is overlain by 60 cm of light gray to pale brown blocky silt containing a few stringers of tephra. Consists largely of platey clear glass shards composed of fragments of bubble walls and junctions.
Sample Location:

References Cited

[1] Old Crow Tephra found at the Palisades of the Yukon, Alaska, 1991

Beget, J. E., Edwards, Mary, Hopkins, David, Keskinen, Mary, and Kukla, G. J., 1991, Old Crow Tephra found at the Palisades of the Yukon, Alaska: Quaternary Research, v. 35, n. 2, p. 291-297.

[2] The Stampede Tephra: a middle Pleistocene marker bed in glacial and eolian deposits of central Alaska, 1991

Beget, J. E., and Keskinen, Mary, 1991, The Stampede Tephra: a middle Pleistocene marker bed in glacial and eolian deposits of central Alaska: Canadian Journal of Earth Sciences [Journal Canadien des Sciences de la Terre], v. 28, n. 7, p. 991-1002.

[3] Late Pleistocene environments of the western Noatak basin, northwestern Alaska, 1999

Elias, S. E., Hamilton, T. D., Edwards, M. E., Beget, J. E., Krumhardt, A. P., and Lavoie, C., 1999, Late Pleistocene environments of the western Noatak basin, northwestern Alaska: Geological Society of America Bulletin, v. 111, p. 769-789.