▁of ▁the ▁cluster , ▁and ▁gla cial ▁cir ques ▁cutting ▁their ▁n ort he astern ▁fl anks ▁reve al ▁layers ▁of ▁sc oria ▁and ▁la vas . ▁Pu qu íos ▁has ▁an ▁am ph it he atre ▁structure ▁on ▁its ▁western ▁side . ▁Pac o ▁Pac o ▁( 4 . 4 1 – 4 . 2 7 ▁my a ) ▁is ▁located ▁north ▁of ▁most ▁G ordo ▁group ▁vol cano es . ▁It ▁forms ▁a ▁ ▁wide ▁str ato con e ▁with ▁a ▁la va - filled ▁cr ater , ▁and ▁layers ▁of ▁sc oria ▁and ▁ag gl ut in ated ▁la vas ▁dip ▁from ▁it . ▁Vol can ▁P ab ell ón ▁( 4 . 1 4 – 4 . 1 2 ▁my a ) ▁s its ▁south west ▁of ▁the ▁Pu qu íos - N eg ro ▁r idge . ▁The ▁Las ▁Bol itas ▁la va ▁field ▁( 5 . 2 3 – 5 . 1 3 ▁my a ) ▁is ▁associated ▁with ▁the ▁G ordo ▁group ▁but ▁the ▁vent ▁locations ▁are ▁unknown . ▁The ▁total ▁volume ▁of ▁this ▁group ▁is ▁, ▁indicating ▁a ▁flux ▁rate ▁of ▁. ▁ ▁The ▁ 3 . 6 – 2 . 3 ▁my a ▁Pol an ▁group , ▁with ▁ten ▁dispers ed ▁vol cano es ▁including ▁Mi ño ▁Vol cano , ▁is ▁the ▁largest ▁group ▁in ▁the ▁cluster ▁and ▁includes ▁T res ▁Mon os , ▁La ▁L una , ▁Cer ro ▁Pol an , ▁Ch ai hui ri , ▁Mi ño ▁Vol cano ▁and ▁the