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The environmental extremes of the Last Glacial Maximum and the subsequent warming and sea-level rise into the Holocene had profound implications for human behavior across much of the world. In northern New Guinea, the Maluku Islands, and the Philippines, shell adzes appear during this period alongside contact between islands. In this paper we present new data from the site of Asitau Kuru, Timor-Leste, to show that the creation of shell adzes and greater inter-island connectivity also characterizes the early and middle and early Holocene in the Nusa Tenggara archipelago of southern Wallacea. We suggest that one of the functions of these shell adzes was in making dugout canoes enabling regular access to neighboring islands; the import of exotic stone materials; long-term occupation of very small islands; and, with new hook and line technology, the capture of more fish. This evidence predates the Neolithic in the region and corroborates a linguistic hypothesis that there was a pre-Austronesian interaction sphere covering much of Wallacea. [ABSTRACT FROM AUTHOR]

Warfare is often considered as a key factor in the formation complex societies, but in the Pacific archaeological evidence for inter-group conflict during political centralization is rare. Most earthwork forts in Tonga are assumed to have been built in the nineteenth century when the traditional system of rulership collapsed, yet few forts on Tongatapu have been excavated or 14C dated. A fort in the chiefly center of the ancient Tongan state was mapped with theodolite and LiDAR, and excavated. Radiocarbon and traditional history indicate the fort known as the Lapaha Kolotau was made in the fourteenth century AD at the same time that chiefly architecture was being built at an unprecedented scale at the new elite center. The construction of an earthwork fort provides the first evidence that political centralization in Tonga was likely to have been contested. [ABSTRACT FROM AUTHOR]

The article presents results of an obsidian sourcing study on artifacts from Tonga and Fiji. New LA-ICPMS data on obsidian source locations on Tafahi in northern Tonga are discussed in relation to inter-island mobility during two important phases in the Central Pacific: the late-Lapita phase in Fiji-West Polynesia at 2700–2600 cal. BP and during the time of the rise of Polynesian chiefdoms at ∼1000–400 cal. BP. The sourcing results indicate that two sources of obsidian were exploited during Tongan prehistory. It is suggested that different modes of interaction were responsible for obsidian movement during the early and late phases of Tongan prehistory. [ABSTRACT FROM AUTHOR]