Narrow margins: standardised manufacturing of obsidian stemmed tools as evidence for craft specialisation and social networks in mid-Holocene New Britain. In From Field to Museum—Studies from Melanesia in Honour of Robin Torrence, ed. Jim Specht, Val Attenbrow, and Jim Allen

Geochemical studies have shown that between ca 6000 and 3400 cal. BP, distinctive stemmed tools were produced at obsidian sources on New Britain and transported widely throughout the island and the Archipelago, implying extensive social networks linking communities across the region. Technological studies at the sources on Willaumez Peninsula of New Britain have suggested specialisation in the production of the two major types of stemmed tools, with implications for the nature of society at that time.