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Sample ID:FC-82a
Station ID:FC-82
Date Sampled:2000-07-15
Sample Type 1:Lava
Text Description:
Second, lower ignimbrite seen. Several surge layers, interbedded by welded flow layers. These may also be water-laid lava, as lava seems pillow-like. Angular pumice clasts in stratified (phreatomagmatic surge?) beds suggest minimal transport. Welded flow / lava beds are ~15-20 m thick, then alluvial bed containing reworked glass bits ~ 1m thick (suggesting large time gap between low flow and overlying cinders. 10 m of red agglomerate cinders overly that. There may be a cap rock (Fisher Tuff?) above the cinders in a distant outcrop Cinders above lower PF / lava. Red, aphyric

Volcanism on Unimak Island, Alaska, USA: a special focus on Shishaldin and Fisher volcanoes


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