Sample: ACT-669


Sample ID: ACT-669 [1]
Station ID: Lignite _Creek
AT Num:
Volcano:
Possible source:
Eruption:
Collector: Beget, J. E.
Date sampled:
Sample type 1: Tephra Fall
Color: tan to white
Final unit:
Text Description: Tan to white layer as much as 10-20 cm thick, exposed in the center of silt block. Finely grained volcanic glass shards with a modal diameter of 20-40 microns. The tephra bed is strongly folded into a pattern that mirrors the shape of the margin of the silt block, indicating that the silt block and surrounding gravels were both subject to a similar history of compression and faulting. A 2-4 cm thick, black, organic-rich layer associated with the tephra is also tightly folded and apparently constitutes a paleosol that originally underlay the tephra.
Sample Location:

References Cited

[1] 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.