New information from an old discovery: Geological analysis of a stone adze found on Pohnpei, Micronesia

Abstract Geological analysis was conducted on a stone adze, which was accidentally dug up from an intertidal dredging site on a reef flat in Pohnpei Island, Micronesia in the 1980s. Detailed geological observations identified the material as metamorphic rock (schist), not basalt as originally reported. This result places its source in the continental rocks of Island Melanesia, most probably New Guinea. The location where it was recovered suggests an age that may well go back to when the island was first settled in the early centuries AD. The eastern Micronesian homeland is often thought to be eastern Melanesia based on linguistic and archaeological evidence. The adze, which may have functioned as a prestige good, was possibly brought from their homeland by early settlers or their immediate successors, or imported from New Guinea by them, suggesting that they still had interaction with the Lapita homeland region even after the decline of Lapita long-distance communications. This is the first artifact found at an early settlement site in Micronesia that is documented to be imported from Melanesia and sheds light on a possible early eastern Micronesian settlers’ interaction system.