The stone, which is no more than 5cm long on the longest side, was found by an archeology student during the excavation of a Neolithic shrine at Vasagård on the southern part of the Baltic island.
Dr Flemming Kaul, an expert on Bronze Age iconography at the National Museum of Denmark, said that he now believes that the criss-cross pattern on the stone shows topographical detail of land on the island as it was between 2700 and 2900 BC.
“These are not accidental scratches,” Dr Kaul told the history and archeology magazine Skalk. “Some of the lines may be reproductions of ears of corn, or plants with leaves.”
Dr Kaul said that if the stone was indeed a map it would be “something very unique, without parallel”. Carvings on some rocks in Italy have been identified as maps but nothing similar has been found in Scandinavia.
The patterns on previous stones found at the site appear to show the sun and the sun's rays, and are thought to have been used in rituals.
Like them, this stone was found broken in two. Archeologists suspect that the stones may have been deliberately broken as part of a desacralization process at the shrine.
According to the National Museum, the centre of the stone shows corn in well-defined fields, surrounded by fields which have been ploughed ready for sowing. Archeologists are interpreting other marks as fences, trees, and perhaps paths.