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DISCUSSION ABOUT THIS MAP 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. Many young volcanic features of Newberry volcano have become part of the newly formed Newberry National Volcanic Monument, which was created on November 5, 1990. Enabling legislation, Public Law 101-522, resulted from three years of intense work by a diverse group of central Oregon citizens, including those from environmental, geothermal, timber, and recreation groups. The monument is managed by the United States Forest Service, U.S. Department of Agriculture. It includes the caldera and extends along the northwest rift zone to the Deschutes River. About 30 percent of the area within the monument is covered by Holocene volcanic products erupted from Newberry volcano. This geologic map is one product of an evaluation of Newberry volcano conducted for the Geoth~rmal Research Program of the U.S. Geological Survey. As mapping progressed, the U.S Geological Survey started a drilling program to understand the volcano's hydrologic regime and geothermal potential (Sammet, 1981; Macleod and Sammet, 1982). Numerous other studies, many of which were published in 1988, describe additional drilling and drill-core analysis, modeling of the caldera's hydrology and its hydrothermal flow system, analyzing gravity and aeromagnetic data, characterizing the volcano's electrical structure, determining the regional crustal velocity structure, and imaging of the local velocity structure below Newberry volcano using teleseismic and explosive sources (see Fitterman, 1988, for overview and additional references). Two field trip guides are avaUable for Newberry volcano and surrounding area (Macleod and others, 1981; Jensen, 1988). This geologic map distinguishes rocks and deposits on the basis of their composition (for example, andesite versus rhyolite) and lithology (for example, lava flows mapped separately from pyroclastic-flow deposits). Most flank lavas, which are chiefly basaltand basaltic andesite, are grouped together but could be further subdivided by additional mapping and chemical analyses. The caldera

Geologic map of Newberry Volcano, Deschutes, Klamath, and Lake counties, Oregon