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Text Description: Upper Pumice is 3-20cm thick and dark yellow-brown, a mixture of brown-beige pumice and dark gray-black scoria (42 wt% and 23 wt% of layer, respectively) and an abundance of non-vitric lithics (32 wt% of layer). Overall the PU lapilli are poorly sorted and vary in mean grain size (6-14mm) with the layer. Scoriaceous clasts are larger tha pumiceous clasts and lithic fragments (mean dia ~5mm and ~3mm, respectively). Scoriaceous bombs up to 10cm in the long dimension occur up to 10km from summit. References:  Stratigraphy, distribution, and evidence for mafic triggering of the ca. 8.5 ka Driftwood Pumice eruption, Makushin Volcano, Alaska, U.S.A. |
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