▁placing ▁them ▁in ▁the ▁sh osh on ite ▁range ▁for ▁al kal ine ▁series . ▁ ▁Since ▁the ▁ 1 8 1 5 ▁er u ption , ▁the ▁low erm ost ▁portion ▁contains ▁depos its ▁of ▁inter layer ed ▁sequences ▁of ▁la va ▁and ▁py ro cl astic ▁materials . ▁Appro xim ately ▁ 4 0 % ▁of ▁the ▁layers ▁are ▁represented ▁in ▁the ▁ ▁la va ▁flows . ▁Th ick ▁sc oria ▁b eds ▁were ▁produced ▁by ▁the ▁fragment ation ▁of ▁la va ▁flows . ▁Within ▁the ▁upper ▁section , ▁the ▁la va ▁is ▁inter bed ded ▁with ▁sc oria , ▁t uff s , ▁py ro cl astic ▁flows ▁and ▁py ro cl astic ▁falls . ▁Tamb ora ▁has ▁at ▁least ▁ 2 0 ▁par as it ic ▁con es ▁and ▁la va ▁dom es , ▁including ▁D oro ▁A fi ▁To i , ▁K adi endi ▁N ae , ▁M olo ▁and ▁Ta he . ▁The ▁main ▁product ▁of ▁these ▁par as it ic ▁v ents ▁is ▁bas alt ic ▁la va ▁flows . ▁ ▁E rupt ive ▁history ▁ ▁Rad i oc ar bon ▁d ating ▁has ▁established ▁that ▁Mount ▁Tamb ora ▁had ▁er upt ed ▁three ▁times ▁during ▁the ▁current ▁Hol oc ene ▁epo ch ▁before ▁the ▁ 1 8 1 5 ▁er u ption , ▁but ▁the ▁magn itudes ▁of ▁these ▁er u ptions ▁are ▁unknown . ▁Their ▁estimated ▁dates ▁are ▁ 3 9 1 0   BC ▁ ± ▁ 2 0 0 ▁years , ▁