AMS RADIOCARBON DATING AND ORGANIC RESIDUE (FTIR) ANALYSIS OF SAMPLES FROM SITE 14OT5-H2, OTTAWA COUNTY, KANSAS

A possible bison bone fragment was recovered from House 2 of the Minneapolis site, 14OT5, situated in Ottawa County, Kansas. An AMS radiocarbon date of 1070 ± 15 RCYBP had been obtained on ceramic residue from this site, but was not a credible age for this context. Therefore, a fragment from the long bone shaft was submitted for AMS radiocarbon dating to obtain a context date to corroborate or refute the residue date; however, no collagen was present. As a result, charred residue from a ceramic fragment was selected as an alternative for AMS radiocarbon dating. The expected age for the bone was between 650–700 RCYBP. Organic residue analysis using Fourier Transform Infrared Spectroscopy (FTIR) also was performed on the bone fragment to better understand the signature of deteriorated bone that does not retain collagen. In addition, FTIR analysis was conducted on the ceramic fragment from which the visible residue was recovered for AMS dating.

研究人员从堪萨斯州渥太华县14OT5号明尼阿波利斯遗址2号房址中，发掘出一件疑似野牛骨骼残片。此前针对该遗址出土的陶瓷残留物已获得加速器质谱碳十四测年（AMS radiocarbon dating）结果为1070±15 RCYBP，但该年代并不符合该出土层位的可靠年代范围。为此，研究人员将一件长骨骨干残片送检加速器质谱碳十四测年，以期获取对应层位的年代数据以佐证或驳正前述残留物测年结果，但该残片未检出胶原成分。因此，研究人员转而选取一件陶瓷残片上的炭化残留物作为替代样本，进行加速器质谱碳十四测年。该骨骼样本的预期年代范围为650~700 RCYBP。此外，研究人员还采用傅里叶变换红外光谱（Fourier Transform Infrared Spectroscopy, FTIR）对该骨骼残片开展有机残留物分析，以期深入解析无胶原保留的退化骨骼的特征谱线。与此同时，针对用于加速器质谱测年的陶瓷残片，研究人员也开展了傅里叶变换红外光谱分析。