P ▁ice ▁core ; ▁D ye ▁ 3 ▁ice ▁core ; ▁B ip olar ▁comparison ; ▁Ant ar ctic ▁ice ▁core ▁( B under ▁and ▁Cole - D ai , ▁ 2 0 0 3 ); ▁Ant ar ctic ▁ice ▁core ▁( C ole - D ai ▁et ▁al ., ▁ 1 9 9 7 ); ▁Cr ête ▁ice ▁core , ▁in ▁central ▁Green land , ▁ ▁b enth ic ▁for amin if era ▁in ▁deep ▁sea ▁sed iment ▁cores ▁( L is ieck i , ▁Ray mo ▁ 2 0 0 5 ), ▁do ▁not ▁agree ▁with ▁each ▁other ▁sometimes . ▁The ▁ 5 3 6 – 5 4 7   AD ▁dust - ve il ▁event ▁might ▁be ▁an ▁impact ▁event . ▁ ▁Hol oc ene ▁er u ptions ▁ ▁The ▁Hol oc ene ▁epo ch ▁begins ▁ 1 1 , 7 0 0 ▁years ▁B P , ▁( 1 0   0 0 0 ▁ 1 4 C ▁years ▁ago ) ▁ ▁Since ▁ 2 0 0 0 ▁AD ▁▁ 1 0 0 0 – 2 0 0 0 ▁AD ▁▁ 1 ▁to ▁ 1 0 0 0 ▁AD ▁ ▁Before ▁the ▁Common ▁Era ▁( BC / B CE ) ▁ ▁Ple ist oc ene ▁er u ptions ▁ 2 . 5 8 8 ▁ ±   0 . 0 0 5 ▁million ▁years ▁B P , ▁the ▁Qu atern ary ▁period ▁and ▁Ple ist oc ene ▁epo ch ▁begin . ▁ ▁Notes ▁ ▁I cel and ▁has ▁four ▁vol