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Updated: Jul 14, 2025

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独立的年龄估计解决了白沙古人类足迹的争议

Jeffrey S Pigati¹, Kathleen B Springer¹, Jeffrey S Honke¹

¹US Geological Survey, Denver Federal Center, Denver, CO 80225, USA.

Science (New York, N.Y.)

|October 5, 2023

概括

据证实,白沙国家公园的人类足迹已有2万3千至2万1千年历史. 新的约会方法证实了先前的发现, 证实了北美在最后一个冰川时期的存在.

科学领域:

古生态学
四年纪地质学
考古学

背景情况:

在白沙国家公园的人类足迹之前使用放射性碳测年法测年为2300021000年前.
这些日期的准确性受到质疑,因为可能存在旧碳储存效应.

研究的目的:

为了评估现有的放射性碳年龄的真实性.
建立一个强大的时间框架, 早期人类在北美存在.

主要方法:

地上花粉的校准放射性碳 (¹⁴C) 来自与Ruppia种子相同的层级地平线.
从足迹载体序列中测定沉积物的光学刺激发光 (OSL) 年代.

主要成果:

陆地花粉的新年龄与原来的种子年龄一致.
沉积物的OSL年代证实了已建立的时间框架.
白沙脚印的时间框架被证实是稳固的.

结论:

在最后一个冰川时期,人类就已经存在于北美.
怀特桑德斯足迹的年代是科学的, 重申早期人类到达美洲.

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