Chronological sequencing, site selection, and environmental context of Neolithic island settlements in southeastern coastal China

Abstract

Prehistoric island-type sites in coastal areas are highly influenced by marine hydrological changes due to their unique geographical settings. Haitan Island in South China is a key area for understanding the origins and dispersal of Austronesian civilization. Recent archaeological investigations have uncovered key Neolithic sites on the island, yielding a material record that offers a unique opportunity to address these questions. However, addressing the gaps in the absolute chronology of these sites and unraveling the dynamic processes of human-environmental evolution remain urgent research priorities. This study used Thermoluminescence (TL) and Optically Stimulated Luminescence (OSL) dating techniques to analyze pottery from Neolithic sites on Haitan Island, southeastern China, to establish a reliable chronology. Dating results (radiocarbon and pottery OSL) indicate that the Xiying, Jianhu, and Citanghoushan sites on Haitan Island date to the mid-Holocene (7.5–6.5 ka). These findings extend the temporal range of the Keqiutou culture (6.5–5.5 ka) in the Minjiang River lower reaches, highlighting its significance in regional archaeology. Comparing the chronology of Haitan Island sites with Holocene sea-level changes at the Minjiang River mouth reveals that ancient human activity was primarily concentrated there during the high sea-level stage from 7 to 6 ka. The terrace where the Keqiutou site group is currently situated provided an optimal habitat for ancient humans, offering shelter and abundant food resources essential for survival.