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Introduction Newberry Volcano, one of the largest Quaternary volcanoes in the conterminous United States, is a broad shield-shaped volcano measuring 60 km north-south by 30 km east-west with a maximum elevation of more than 2 km. Newberry Volcano is the product of deposits from thousands of eruptions, including at least 25 in the past approximately 12,000 years (Holocene Epoch). Newberry Volcano has erupted 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. Such a long eruptive history and recent activity suggest that Newberry Volcano is likely to erupt in the future. This geologic map database of Newberry Volcano distinguishes rocks and deposits based on their composition, age, and lithology. This geodatabase contains information used to produce the geologic mapping published as Sheet 1 and Sheet 2 in U.S. Geological Survey Miscellaneous Investigations Series Map I-2455 (MacLeod, Sherrod, Chitwood, and Jensen, 1995). The main component of this publication is a geologic map database prepared using geographic information system (GIS) applications. Included are links to files to view or print the map sheets, and the accompanying pamphlet from U.S. Geological Survey Miscellaneous Investigations Series Map I-2455. For the most up-to-date information on the status of U.S. Volcanoes and Current Activity Alerts, please refer to the U.S. Geological Survey Volcano Hazards Program Web site. |
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