甘肃省徐家城旧石器遗址的年代

庄浪县徐家城遗址是甘肃省新发现的含丰富旧石器文化遗物的遗址,主要埋藏于水洛河第二级阶地上覆的马兰黄土中。AMS14C测年及气候事件对比相结合的综合年代研究显示, 遗址主要文化层时代集中在距今4.6~2.3万年间, 属于晚更新世晚期。遗址所在的陇西盆地发现近50处晚更新世旧石器遗址, 测年、黄土地层学等的综合年代学研究利于建立该地区晚更新世完整的年代学框架, 为我们进一步讨论晚更新世人类行为演化、人类行为与环境变化的互动等重要学术问题提供了基础。

A report on dating of the Xujiacheng Paleolithic site in Gansu Province,North China

The Xujiacheng site, buried in the Malan Loess overlying the second terrace of the Shuiluo River in Zhuanglang County, Gansu Province, is a significant Paleolithic site yielding plenty of archaeological materials. AMS14C dating and climatic comparisons with other sites indicate that the entire suite of assemblages date roughly from 46,000 to 25,000 calibrated radiocarbon years BP. Site formation processes such as sediment movement and trampling in relation to the stratigraphic position of cultural materials are important to understand when dating multi-level sites such as Xujiacheng. The AMS14C method was used to date this site. The four cultural layers (4A, 4B, 4C and 5) provide the following dates: (22,925±426) - (28,160±342), (41,488±378) - (42,822±451), (45,167±524) - (46,222±714), and older than 46,222±714, respectively. Comparison with climatic events as indicated by magnetic susceptibility at Xujiacheng, Zhuanglang 5, and the Dadiwan site shows that they have similar ages of the same events (such as H4 and A4) that were well dated in Hulu Cave record. With these agreements, there is more confidence in our AMS14C dates for the Xujiacheng site.
A complete high-resolution chronology is vital for accurate archaeological dating, and the Longxi Basin where the Xujiacheng site is located in is an ideal area for using different dating methods and the loess-paleosol sequence analysis. Future Paleolithic work in this area with solid control of chronology will make a significant contribution to our understanding of the interaction between human behavior and environmental change in Late Pleistocene in North China.