As there is no written record in the times of dolmens, the date of dolmen is assumed, based on the period of artefacts buried together or the results of radio carbon dating employed as a scientific method to acquire absolute date. It is considered that date of dolmens ranges from 12th to11th Centuries B.C.
It is assumed that dolmens disappeared in the 3rd~2nd Centuries B.C based on the relics excavated in the first-half of the Bronze Age. Thus the dolmens of Korea is the representative architecture in the Bronze Age existing for 1,000 years from the 12th century B.C to the 2nd century B.C.
Why did dolmens disappear? It appears to have been related to the social changes at that time. The society in later dolmen period adopted the advanced culture actively by newly emerged ruling class. It means there must have been a radical dispersion and assemblage of groups by interests of ruling classes with different regional bases.