Science. 1978 Apr 7;200(4337):16-21. doi: 10.1126/science.200.4337.16.
By concentrating carbon-14 through thermal diffusion, it is possible to extend the range of carbon-14 dating to 75,000 years ago. Samples with very low contamination levels have been encountered, and a reliable chronology appears possible. A Pacific Northwest climatic curve has been derived from palynological studies. The Pacific Northwest curve and the Great Lakes glacial history are age-calibrated by radiocarbon dating. The climatic patterns in the Pacific Northwest and Northwest Europe are similar in the early part of the last glaciation, with interstades near 60,000, 65,000, and 70,000 years ago. An age of 74,700 years for the St. Pierre interstade indicates a possible correlation with the previous interglacial.
通过热扩散浓缩碳-14，可以将碳-14 测年的范围扩展到 75000 年前。已经遇到了污染水平非常低的样本，并且似乎有可能建立可靠的年代序列。从孢粉学研究中得出了太平洋西北地区的气候曲线。太平洋西北地区的曲线和大湖冰川历史通过放射性碳测年进行了校准。在上一次冰期的早期，太平洋西北地区和西北欧的气候模式相似，在大约 60000、65000 和 70000 年前存在间冰期。圣皮埃尔间冰期的年龄为 74700 年，表明可能与前一次间冰期存在关联。
