Alaska Volcano Observatory

Wrangell Lava. Rhyolite flow. Light-gray, devitrified, microcrystalline rocks with red and black vitrophyre phases exhibiting pronounced flow banding. Usually very massive. Viscous extrusives of local origin, presumably from rhyolite domes (unit QTrd)

Sample Location:

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Legend

	Red (Warning)
	Orange (Watch)
	Yellow (Advisory)
	Green (Normal)
	Uninstrumented

300 km

200 mi

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References Cited

[1] Geologic map of the Nabesna B-5 Quadrangle, Alaska, 1982

Lowe, P.C., Richter, D.H., Smith, R.L., and Schmoll, H.R., 1982, Geologic map of the Nabesna B-5 Quadrangle, Alaska: US Geological Survey Geologic Quadrangle Maps 1566, 1 sheet, scale 1:63,360, available at http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=13055 .

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