▁the ▁above ▁period , ▁especially ▁ 4 0 0 0 - 2 0 0 0 ▁BC . ▁Je ul mun ▁( H ang ul : ▁ 즐 문 , ▁Han ja : ▁ <0xE6> <0xAB> <0x9B> 文 ) ▁means ▁" Com b - pattern ed ". ▁A ▁bo om ▁in ▁the ▁arch ae ological ▁exc av ations ▁of ▁Je ul mun ▁Period ▁sites ▁since ▁the ▁mid - 1 9 9 0 s ▁has ▁increased ▁knowledge ▁about ▁this ▁important ▁form ative ▁period ▁in ▁the ▁pre history ▁of ▁East ▁Asia . ▁ ▁The ▁Je ul mun ▁was ▁a ▁period ▁of ▁hunting , ▁gather ing , ▁and ▁small - scale ▁cultiv ation ▁of ▁plants . ▁Arch ae olog ists ▁sometimes ▁refer ▁to ▁this ▁life - style ▁pattern ▁as ▁" bro ad - spect rum ▁hunting - and - g ather ing ". ▁ ▁In cip ient ▁Je ul mun ▁ ▁The ▁orig ins ▁of ▁the ▁Je ul mun ▁are ▁not ▁well ▁known , ▁but ▁raised - cl ay ▁pattern ▁Y ung g im un ▁pot tery ▁( ; ▁Han ja : ▁ 隆 起 文 土 器 ) ▁appear ▁at ▁southern ▁sites ▁such ▁as ▁G os an - ni ▁in ▁Je ju - do ▁Island ▁and ▁U b ong - ni ▁on ▁the ▁se aco ast ▁in ▁U ls an . ▁Some ▁arch ae olog ists ▁describe ▁this ▁range ▁of ▁time ▁as ▁the ▁" In cip ient ▁Je ul mun ▁period " ▁and ▁suggest ▁that ▁the ▁G os an - ni ▁pot tery ▁dates ▁to ▁