Purico Complex Summit Elevation: 5703 m Latitude:                23.00°S Longitude:             67.75°W The Purico volcanic complex consists of two  ignimbrite sheets, separated by a short  erosional interval, that were erupted about 1.3  million years ago, along with several  stratovolcanoes and lava domes that define a  postulated 10 x 20 km ring fracture. Cerro  Toco volcano overlies the vent area of the  Cajón Ignimbrite and a sulfur mine on its SE  flank was mined until the early 1990s. The  youngest lava domes, Cerro Chascón de  Purico and Cerro Aspero are of Holocene age  (de Silva and Francis, 1991). Both domes differ morphologically from many other flat-topped  silicic Andean volcanic domes and have 300-400 m high conical profiles. Cerro Chascón  was formed by a series of viscous lava flows, whereas Cerro Aspero appears to be a single  Pelean-type dome. The Chascón de Purico dacitic dome rising 1200 m above the ignimbrite  shield has a well-preserved summit crater and lava flows that show no evidence of glacial  modification. The dacitic-to-andesitic Macon stratovolcano of Holocene age lies at the  southern end of the complex, and the Alitar maar at the SE end displays constant solfataric  activity. (Global Volcanic Program) Photo: Rolf Cosar HOME click on pictures to enlarge Photo: Rolf Cosar Google earth