"Cerros Pular on the NE and Pajonales on the SW form a 12-km-long volcanic ridge that is mostly pre-Holocene, but may show evidence for some Holocene activity. The chain lies NW of the Salar de Pular, about 15 km west of the Argentinian border. Andesitic lava flows from the chain, which lies NE of Socompa volcano, overlie dacitic lava domes. The extensive lava flows reach the lower flanks of the chain, and about 10 craters are present. A major satellite vent west of the ridge, also known as Cerro Pajonales, appears to be the youngest feature of the volcanic complex. An uncertain small explosive eruption was reported in 1990, but the vent location was not known."  -Smithsonian Volcano Archive
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