▁of ▁Stone ▁Age ▁tools ▁in ▁Australia ▁has ▁been ▁much ▁deb ated . ▁ ▁Dis pers al ▁throughout ▁E uras ia ▁ ▁The ▁population ▁brought ▁to ▁South ▁Asia ▁by ▁coast al ▁migration ▁appears ▁to ▁have ▁remained ▁there ▁for ▁some ▁time , ▁during ▁roughly ▁ 6 0 , 0 0 0 ▁to ▁ 5 0 , 0 0 0 ▁years ▁ago , ▁before ▁spread ing ▁further ▁throughout ▁E uras ia . ▁This ▁dispers al ▁of ▁early ▁humans , ▁at ▁the ▁beginning ▁of ▁the ▁Upper ▁Pale ol ith ic , ▁gave ▁rise ▁to ▁the ▁major ▁population ▁groups ▁of ▁the ▁Old ▁World ▁and ▁the ▁Amer icas . ▁ ▁Tow ards ▁the ▁West , ▁Upper ▁Pale ol ith ic ▁populations ▁associated ▁with ▁mit och ond rial ▁ha p lo group ▁R ▁and ▁its ▁derivatives , ▁spread ▁throughout ▁Asia ▁and ▁Europe , ▁with ▁a ▁back - m igration ▁of ▁M 1 ▁to ▁North ▁Africa ▁and ▁the ▁Horn ▁of ▁Africa ▁several ▁mill enn ia ▁ago . ▁ ▁Pres ence ▁in ▁Europe ▁is ▁certain ▁after ▁ 4 0 , 0 0 0 ▁years ▁ago , ▁possibly ▁as ▁early ▁as ▁ 4 3 , 0 0 0 ▁years ▁ago , ▁rapidly ▁replacing ▁the ▁Ne ander th al ▁population . ▁Contempor ary ▁Europe ans ▁have ▁Ne ander th al ▁ancest ry , ▁but ▁it ▁seems ▁likely ▁that ▁substantial ▁inter bre eding ▁with ▁Ne ander th als ▁ceased ▁before ▁ 4 7 , 0 0 0 ▁years ▁ago , ▁i . e . ▁took ▁place ▁before ▁modern ▁humans ▁entered ▁Europe . ▁ ▁There ▁is