0 0 ▁BC ) ▁has ▁figured ▁in ▁Australian ▁Ab original ▁or al ▁trad itions . ▁ ▁For ▁the ▁Rio ▁Cu arto ▁cr aters , ▁ 2 0 0 2 ▁research ▁suggests ▁they ▁may ▁actually ▁be ▁a e ol ian ▁structures . ▁The ▁E ID ▁gives ▁a ▁size ▁of ▁about ▁ ▁for ▁Cam po ▁del ▁C iel o , ▁but ▁other ▁sources ▁quote ▁. ▁ ▁Lar ge ▁cr aters ▁( 1 0 ▁ka ▁to ▁ 1 ▁Ma ) ▁From ▁between ▁ 1 0 ▁thousand ▁years ▁to ▁one ▁million ▁years ▁ago , ▁and ▁with ▁a ▁diameter ▁of ▁ ▁or ▁more . ▁The ▁largest ▁in ▁the ▁last ▁one ▁million ▁years ▁is ▁the ▁ ▁Z ham ans hin ▁cr ater ▁in ▁Kaz akh stan ▁and ▁has ▁been ▁described ▁as ▁being ▁capable ▁of ▁producing ▁a ▁nuclear - like ▁winter . ▁ ▁However , ▁the ▁currently ▁unknown ▁source ▁of ▁the ▁enorm ous ▁Austral as ian ▁stre wn field ▁( c . ▁ 7 8 0 ▁ka ) ▁could ▁be ▁a ▁cr ater ▁about ▁ ▁across . ▁ ▁Lar ger ▁cr aters ▁( 1 ▁Ma ▁to ▁ 1 0 ▁Ma ) ▁ ▁From ▁between ▁ 1 ▁and ▁ 1 0 ▁million ▁years ▁ago , ▁and ▁with ▁a ▁diameter ▁of ▁ ▁or ▁more . ▁If ▁un cert aint ies ▁regarding ▁its ▁age ▁are ▁resolved , ▁then ▁the ▁largest ▁in ▁the ▁last ▁ 1 0 ▁million ▁years ▁would ▁be ▁the ▁ ▁Kar ak ul ▁cr ater ▁which ▁is ▁listed ▁in ▁E ID ▁with ▁an ▁age ▁of ▁less ▁than ▁five ▁Ma , ▁or