Newberry volcano, one of the largest Quaternary volcanoes in the conterminous United States, is a broad shieldlike landform with a summit caldera 7 km across. It comprises the products of thousands of eruptions, at least 25 of which occurred during the last 10,000 years (Holocene Epoch). Eruptions have occurred as recently as 1,300 years ago, but isotopic ages indicate that the volcano began its growth as early as 0.6 million years ago. Thus, its long history and recent activity indicate that Newberry volcano is likely to erupt in the future.
Additional publication details
USGS Numbered Series
Geologic map of Newberry Volcano, Deschutes, Klamath, and Lake counties, Oregon
U.S Geological Survey
Volcano Science Center, Cascades Volcano Observatory
2 maps on 2 sheets :col. ;89 x 65 cm. and 45 x 49 cm., sheets 104 x 137 cm., and 61 x 102 cm. +1 pamphlet (23 p. : ill. ; 28 cm.), folded in envelope 30 x 24 cm.