This paper studies a glaciated area on this volcanic complex which is located on the limit between the andean Altiplano and the ramp reaching the Pacific Ocean coast. The report of 36C1 cosmogenic isotopes of 8 surface samples on moraine boulders show several local glacier maximum advances among 21 and 11 kyr, over Marine Isotope Stage MIS 2. Glacial data analysis suggests very interesting new paleoclimatic and geomorphologic interpretations, both in local and regional scales.