U.S. Geological Survey

Geochronology and Geology of late Oligocene through Miocene Volcanism and Mineralization in the Western San Juan Mountains, Colorado

By Dana J. Bove, Ken Hon, Karin E. Budding, John F. Slack, Lawrence W. Snee, and Ross A. Yeoman

U.S. Geological Survey Open-File Report 99-0347

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