In the archaeological record there are well-defined traces of this expansion which allow the path it took to be followed and dated with some certainty. It is thought that by roughly 1400 BCE, "Lapita Peoples", so-named after their pottery tradition, appeared in the Bismarck Archipelago of north-west Melanesia. This culture is seen as having adapted and evolved through time and space since its emergence "Out of Taiwan". They had given up rice production, for instance, after encountering and adapting to breadfruit in the Bird's Head area of New Guinea. In the end, the most eastern site for Lapita archaeological remains recovered so far has been through work on the archaeology in Samoa. The site is at Mulifanua on Upolu. The Mulifanua site, where 4,288 pottery shards have been found and studied, has a "true" age of c. 1000 BCE based on C14 dating. A 2010 study places the beginning of the human archaeological sequences of Polynesia in Tonga at 900 BCE, the small differences in dates with Samoa being due to differences in radiocarbon dating technologies between 1989 and 2010, the Tongan site apparently predating the Samoan site by some few decades in real time.