Bove, Dana J. Geochronology and geology of late Oligocene through Miocene volcanism and mineralization in the western San Juan Mountains, Colorado - Reston, VA U.S. Geological Survey 2001 - 30 p. ilus. Subjects--Topical Terms: DATACION AR-ARGENESIS-YACIMIENTOGEOCRONOLOGIAMINERALIZACIONVOLCANISMOYACIMIENTOS EPITERMALES Subjects--Geographic Terms: COLORADOESTADOS UNIDOS