在117,000至108,000年前,Homo erectus在爪的最后一次出现
Yan Rizal1, Kira E Westaway2, Yahdi Zaim1
1Department of Geology, Institute of Technology Bandung, Bandung, Indonesia.
Nature
|December 20, 2019
概括
这些化石代表了已知的最后一个直立人, 这项研究为岛屿东南亚的这一重要的早期人类遗址提供了第一个可靠的时间表.
科学领域:
- 古人类学
- 四年纪地质学
- 时间层图
背景情况:
- 人类是东南亚最早出现的人类物种,在150多万年前首次出现在爪.
- 在爪的Ngandong遗址中发现了最年轻的Homo erectus化石,
- 之前的测年试已经产生了有争议的结果, 阻碍了对该物种最终存在的清晰理解.
研究的目的:
- 为了建立一个坚实的时间表, 东化石网站和解决这个位置的直立人年龄.
- 提供可靠的时间线索罗河露台序列及其与人类的关系.
- 确定东南亚岛屿上最后一个已知的直立人.
主要方法:
- 采用52个放射年龄估计的贝叶斯模型进行区域和本地时间控制.
- 在洞穴和非人类化石上应用系列测年法,以及露台沉积物的光和40Argon/39Argon测年法.
- 使用系列和系列电子自旋共振 (US-ESR) 方法重新挖掘了东遗址.
主要成果:
- 确立了索罗河在5万年前被转移到肯登山脉.
- 索洛露台的年代介于316至31,000年前, 而东露台的年代介于140,000至92,000年前.
- 在恩甘东发现的非人类化石可以追溯到134118ka (US-ESR) 和109106ka (系列),Homo erectus骨床的年龄在117到108千年前之间.
结论:
- 恩甘东的直立人化石可以追溯到11万到10万年前,
- 这项研究证实, 恩甘东遗址是人类长寿物种"直立人" (Homo erectus) 的最后一个已知遗址.
- 这些发现为了解东南亚人种的晚期生存和古生态学提供了关键的时间框架.
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