Bone Diagenesis and Radiocarbon Dating of Fish Bones at the Shag River Mouth Site, New Zealand
Bone Diagenesis and Radiocarbon Dating of Fish Bones at the Shag River Mouth Site, New Zealand
复制标题
DOI：
10.1006/jasc.1999.0446
复制
发表时间：
2000-02
影响因子：
2.8
通讯作者：
F. Petchey;T. Higham
中科院分区：
文献类型：
--
作者：
F. Petchey;T. Higham
新西兰南部的沙格河口遗址从多种样品类型中获得了一系列放射性碳测定结果，这表明该遗址曾在公元14世纪短暂占据过。对骨骼的放射性碳测定揭示了更大的差异，这归因于史前样品降解、污染、不充分的前处理或使用亚化石骨骼的问题。我们使用梭鱼(Thyrites Atun)鱼骨对该地点的骨骼进行了年代测定。为了确定这一材料的年代是否准确，我们进行了一系列分析测试，以确定其保存状态和沉积后污染的程度。这些数据被用来预测哪些样品对14C分析最有用。除了两个有问题的样品外，所得到的年龄与其他可接受的海洋和河口贝壳碳酸盐样品的年龄一致。根据已有的结果，我们认为该遗址的梭鱼鱼骨保存完好，测年可靠。我们重新检查了以前对该部位不同部位的MOA和鼠骨的测定，以根据这些新数据评估它们的准确性。
The Shag River Mouth site in southern New Zealand has yielded a series of radiocarbon determinations from multiple sample types, which suggest that the site was occupied briefly in the 14th century ad. Radiocarbon determinations of bone disclose a greater variation which has been attributed to problems of sample degradation, contamination, inadequate pretreatment or the use of sub-fossil bones in prehistory. We examined the dating of bone at the site using barracouta (Thyrsites atun) fish bone. In order to determine whether this material could be dated accurately, we applied a series of analytical tests to ascertain the preservation state and the extent of post-depositional contamination. These data were used to predict which samples would be most useful for14C analysis. The resultant ages, with the exception of two problematic samples, are consistent with those on other acceptable marine and estuarine shell carbonate samples. Based on the available results, we suggest that barracouta fish bone from this site is well preserved and reliable for dating. We re-examined previous determinations of moa and rat bone from different parts of the site to evaluate their accuracy in the light of this new data.