Colinvaux P A
Science. 1967 Apr 21;156(3773):380-3. doi: 10.1126/science.156.3773.380.
A 14-meter core from a crater lake on Saint Paul Island in the Pribilofs has been examined by pollen analysis. Radiocarbon dating indicates that the core spans more than 10,000 years and probably more than 18,000 years. A sprutce-pollen maximum about 10,000 years ago suggests that spruce advanced to the flanks of the southern coast of the Bering land bridge toward the close of the land-bridge period. The forests of Alaska and Siberia did not merge, however, and the environment of the southern coast of the land bridge remained cold.
通过花粉分析对普里比洛夫群岛圣保罗岛上一个火山口湖的14米岩芯进行了研究。放射性碳年代测定表明，该岩芯跨越了一万多年，可能超过一万八千年。大约一万年前云杉花粉的大量出现表明，在陆桥时期接近尾声时，云杉向白令陆桥南部海岸的侧翼推进。然而，阿拉斯加和西伯利亚的森林并没有合并，陆桥南部海岸的环境仍然寒冷。
