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Augustine reported activity





Event Name : Augustine Crooked Creek Tephra

This is a questionable event.

Start: 8375 (± 210 Years) Years BP C-14 (raw)
Stop: 7725 (± 210 Years) Years BP C-14 (raw)

Tephrafall: BibCard
Eruption Type:Explosive

Description: From Reger and others (1995): "One of several grayish brown-weathering Holocene tephras in Kenai Lowland that are the products of brief, small eruptions of Cook Inlet volcanoes-and not known to be widely distributed-is the Crooked Creek tephra, which is first recognized and informally named in this study. This tephra is identified in 11 stratigraphic sections (table 2 [in original text]) in a narrow belt from west of Tustumena Lake northeast to the vicinity of Sterling (fig. 4 [in original text]). Correlation within this set of samples is good to excellent (SC=0.93-0.99) (table 5 [in original text]). We know of no correlative tephras in the region, but we speculate (from the distribution and high silica content) that Crooked Creek tephra could have been erupted from Mt. Augustine. The Crooked Creek tephra was deposited between 7,725+/-210 14C yr ago and 8,375+/210 14C yr ago (fig. A25; table 2, C10 and C17 [in original text]). It could possibly be the distal equivalent of tephra layer G, which dates >1,830+/-80 14C yr B.P. and <39,890 14C yr B.P. on Augustine Island (Beget and Kienle, 1992)."

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