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Cupmarks on Cover Stones
A unique feature of Korean dolmens are the star maps engraved on the capstone. Some of these markings appear to be random, and are generally thought to be fertility or funeral related, or a tally of sacrificed animals or the frequency of an ancestral rite. Upon closer examination, it was found that many were depictions of star constellations surrounding the North Star.

The markings, called cupmarks, can be arranged sporadically, singularly or grouped together, connected by lines or forming shapes.