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USGS/Cascades Volcano Observatory, Vancouver, Washington

REPORT:
Pumice and other pyroclastic deposits in Mount Rainier National Park, Washington


-- Mullineaux, D.R., 1974,
Pumice and other pyroclastic deposits in Mount Rainier National Park, Washington: U.S. Geological Survey Bulletin 1326, 83p.
At least 22 layers of tephra--volcanic ash and coarser airfall pyroclastic debris--can be recognized among the postglacial deposits in Mount Rainier National Park. Each of these tephra layers records a separate eruptive event. Eleven of the layers were erupted from Mount Rainier; 10 originated at Mount St. Helens volcano 80 km (50 miles) south-southwest of Mount Rainier; and the other came from prehistoric Mount Mazama at the present site of Crater Lake, Oreg., 440 km (275 miles) south of Mount Rainier. -- Mullineaux, 1974

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02/28/07, Lyn Topinka