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| Cerro Panizos Caldera, Bolivia -- This circular feature lies on the border of Bolivia and Argentina. It may be either a collapse caldera, filled by late-stage pyroclastic flows and post-caldera collapse lavas, or a nested caldera. The feature is 40 km in diameter with an average elevation of ~4700 m. Pyroclastic flows associated with the caldera-forming eruption have a volume greater than 500 km3. The area of central region is characterized by numerous dacitic coulées and lava domes with elevations up to 5,400 m. The caldera is thought to be Miocene in age, with no Holocene activity. Courtesy of Peter Francis. |