At Serpentine Bends Site #1, we employed plasma oxidation followed by accelerator mass spectrometry to radiocarbon date two prehistoric rock paintings as well as soot on the shelter ceiling. Pictograph results are 2325 ± 30 ¹⁴C years BP for a black line and 1315 ± 40 ¹⁴C years BP for a red outline of a circle motif. We also utilized X-ray diffraction to chemically identify pyrolyzed carbon in the black stain on the shelter ceiling, confirming that it is from fire smoke. Four radiocarbon ages for the soot represent a weighted average of multiple fires, instead of a single event. The oldest result of 2740 ± 70 ¹⁴C years BP is from the underlying black soot closest to the rock substrate and, as a weighted average of multiple layers, represents a minimum age for human activity at the site. Dating both pictographs and prehistoric soot provide novel methods for dating human activity within rockshelters around the world, especially when there is a lack of excavated materials for study.

在蛇形弯道1号站点，我们采用了等离子体氧化法，然后通过加速器质谱法对两幅史前岩画以及掩体天花板上的烟灰进行了放射性碳测年。象形图的结果是黑线为2325±30 ¹⁴ C年BP，圆形图案的红色轮廓为1315±40 ¹⁴ C年BP。我们还利用X射线衍射来化学鉴定避难所天花板上黑色污点中的热解碳，确认其是来自火烟。烟灰的四个放射性碳年龄代表多次燃烧的加权平均值，而不是单个事件。最旧的结果2740±70 ¹⁴C年BP来自最接近岩石基质的下层黑烟尘，并且作为多层的加权平均值，代表该地点人类活动的最低年龄。象形文字和史前烟灰的约会提供了一种新颖的方法，可以在世界各地的岩棚中对人类活动进行测年，尤其是在缺少挖掘出的研究材料的情况下。