ill án . ▁This ▁er u ption ▁created ▁a ▁ ▁high ▁er u ption ▁column ▁and ▁depos ited ▁about ▁ ▁of ▁rock . ▁A ▁vol can ic ▁explos ivity ▁index ▁of ▁ 4 ▁has ▁been ▁assigned ▁to ▁this ▁event . ▁ ▁The ▁Car én ▁sequence ▁was ▁formed ▁ 1 , 3 8 0 ▁ ± ▁ 3 0 ▁years ▁before ▁present , ▁it ▁is ▁the ▁young est ▁explos ive ▁er u ption ▁of ▁Qu et rup ill án . ▁ ▁In ▁addition , ▁three ▁te ph ras ▁in ▁neighbour ing ▁la kes ▁dated ▁to ▁ 1 6 , 7 4 8 ▁- ▁ 1 6 , 1 8 9 , ▁ 1 5 , 5 9 7 ▁- ▁ 1 2 , 5 8 2 ▁and ▁ 1 2 , 7 0 8 ▁- ▁ 1 2 , 5 6 7 ▁years ▁before ▁present ▁may ▁origin ate ▁from ▁Qu et rup ill án ▁but ▁they ▁have ▁also ▁been ▁attributed ▁to ▁Sol lip ul li . ▁All ▁these ▁te ph ras ▁are ▁of ▁r hy olit ic ▁to ▁r hy od ac it ic ▁composition ▁and ▁the ▁er u ptions ▁that ▁generated ▁them ▁have ▁an ▁estimated ▁vol can ic ▁explos ivity ▁index ▁of ▁ 3 . ▁ ▁Re ports ▁exist ▁of ▁er u ptions ▁during ▁the ▁ 1 9 th ▁century , ▁one ▁er u ption ▁was ▁reported ▁in ▁ 1 8 7 2 . ▁Ex pl os ive ▁activity ▁has ▁a ▁rec urrence ▁interval ▁of ▁about ▁ 1 , 2 0 0 ▁years