Researchers have identified a prehistoric trade corridor dubbed the Jade and Obsidian Route, linking the northern Philippines to the island of Taiwan. Isotopic analysis of ornaments found in Batanes and Luzon confirms that the jade originated from the Fengtian deposits in Taiwan, while obsidian tools discovered at Taiwanese sites were sourced from volcanic flows in the Philippines. This indicates a sophisticated maritime exchange system active as early as 2000 BCE.
This discovery provides critical insight into the early Austronesian migrations and their ability to navigate the treacherous waters of the Luzon Strait. The trade was not merely for raw materials but involved the exchange of finished prestige goods, suggesting a high level of social stratification and cultural connectivity. The findings challenge previous theories that these regions remained isolated until much later in the Neolithic period.