The earliest artifacts from this period are found exclusively in China (mostly in the former territory of Gojoseon - the territory of the kingdom is approximated by the distribution of violin-shaped daggers and table-shaped dolmens.), and seem only gradually to have spread to the Korean peninsula.
De tidligste genstande fra denne periode findes udelukkende i Kina (hovedsagelig i Gojoseons tidligere område - kongeriget er tilnærmet ved fordeling af violinformede dolke og bordformede dysser og synes kun at have gradvist spredt sig til den koreanske halvø.