Over time, the Lapita culture lost much of its early unity; as such, it became increasingly fragmented. The precise reasons for this are unclear. However, over the centuries pottery, settlement and burial practices in Vanuatu all evolved in a more localised direction, with long-distance trade and migration patterns contracting. However some limited long-distance trade did continue, with similar cultural practices and late-period items also being found in Fiji, New Caledonia, the Bismarks and the Solomons. Finds in central and southern Vanuatu, such as distinctive adzes, also indicate some trade connections with, and possibly population movements of, Polynesian peoples to the east.