ank ▁at ▁the ▁ ▁sum mit ▁generated ▁three ▁la va ▁flows , ▁two ▁shorter ▁ones ▁and ▁a ▁long ▁one ▁to ▁the ▁north west . ▁The ▁Az uf rera ▁stage ▁la vas ▁are ▁block y ▁d ac ites ▁with ▁large ▁cl asts ▁and ▁flow ▁front s ▁up ▁to ▁ ▁high . ▁These ▁flows ▁are ▁moder ately ▁alter ed ▁and ▁have ▁ox id ation ▁r inds . ▁There ▁is ▁little ▁evidence ▁of ▁explos ive ▁activity , ▁but ▁it ▁may ▁have ▁been ▁obsc ured ▁by ▁gla cial ▁er os ion . ▁The ▁total ▁volume ▁is ▁, ▁indicating ▁a ▁flux ▁rate ▁of ▁. ▁This ▁vol cano ▁was ▁probably ▁an ▁isolated ▁cone , ▁but ▁the ▁existence ▁of ▁a ▁previous ▁stage ▁cannot ▁be ▁ex cluded . ▁ ▁The ▁second ▁stage , ▁named ▁Rod ado , ▁last ed ▁from ▁ 0 . 9 5 ▁to ▁ 0 . 8 5 ▁my a . ▁It ▁formed ▁on ▁the ▁eastern ▁s lop es ▁of ▁the ▁Az uf rera ▁vol cano , ▁with ▁one ▁vent ▁at ▁the ▁ ▁sum mit . ▁Rod ado ▁stage ▁la vas ▁are ▁block y ▁and ▁pl aty ▁and ▁usually ▁th icker ▁than ▁Az uf rera ▁stage ▁la vas . ▁Some ▁of ▁the ▁sum mit ▁vent ▁la vas ▁are ▁among ▁the ▁most ▁ves icular ▁of ▁this ▁stage . ▁They ▁are ▁also ▁less ▁weather ed ▁( ox id ation ▁r inds ▁are ▁c .   ▁thick ) ▁and ▁less ▁subject ▁to ▁sol f atar ic ▁alter ation . ▁The ▁Cer ro ▁Ch inch illas ▁la vas ▁are ▁the ▁oldest ▁of