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Nature: A 130,000-year-old archaeological site in southern California, USA

The earliest dispersal of humans into North America is a contentious subject, and proposed early sites are required to meet the following criteria for acceptance: (1) archaeological evidence is found in a clearly defined and undisturbed geologic context; (2) age is determined by reliable radiometric dating; (3) multiple lines of evidence from interdisciplinary studies provide consistent results; and (4) unquestionable artefacts are found in primary context1, 2. Here we describe the Cerutti Mastodon (CM) site, an archaeological site from the early late Pleistocene epoch, where in situ hammerstones and stone anvils occur in spatio-temporal association with fragmentary remains of a single mastodon (Mammut americanum). The CM site contains spiral-fractured bone and molar fragments, indicating that breakage occured while fresh. Several of these fragments also preserve evidence of percussion. The occurrence and distribution of bone, molar and stone refits suggest that breakage occurred at the site of burial. Five large cobbles (hammerstones and anvils) in the CM bone bed display use-wear and impact marks, and are hydraulically anomalous relative to the low-energy context of the enclosing sandy silt stratum. 230Th/U radiometric analysis of multiple bone specimens using diffusion–adsorption–decay dating models indicates a burial date of 130.7 ± 9.4 thousand years ago. These findings confirm the presence of an unidentified species of Homo at the CM site during the last interglacial period (MIS 5e; early late Pleistocene), indicating that humans with manual dexterity and the experiential knowledge to use hammerstones and anvils processed mastodon limb bones for marrow extraction and/or raw material for tool production. Systematic proboscidean bone reduction, evident at the CM site, fits within a broader pattern of Palaeolithic bone percussion technology in Africa3, 4, 5, 6, Eurasia7, 8, 9 and North America10, 11,12. The CM site is, to our knowledge, the oldest in situ, well-documented archaeological site in North America and, as such, substantially revises the timing of arrival of Homo into the Americas.

https://www.nature.com/nature/journal/v544/n7651/full/nature22065.html


13万年?美洲?
南加州大学的研究人员发现了人类早在 13 万前就在北美定居的证据。研究报告发表在《自然》期刊上。1991 年,在圣迭哥一高速公路施工现场工作的考古学家发现了乳齿象的部分残骸,乳齿象已经灭绝,它的残骸并不罕见,但令人奇怪的是其它东西。考古学家同时发现了许多锋利的碎石和断骨。石头显示出了作为锤和砧使用的痕迹。乳齿象的部分骨骼也表现出遭到石头工具重击的特征。这一切都看起来像是人类的手笔。科学家认为他们发现罕见的东西,但并没有意识到有多罕见。他们使用 1990 年代还不存在的铀钍同位素测年技术发现,石头工具距今有 13 万年。而现代人类进入北美的最早时间被认为是在大约 2 万年前。
感觉上不是很可信。就是nature也不能盲信。
极品猥琐凤凰眼镜生物党棍左棍五毛愤青爱国
eight代 poor农 root正 shoot
这个Science提出了反对意见,没有坚实证据表明这石头是人工制品。
O3a3c* (M134+, M117-)
Nature上配套的新闻稿也说是“controversial study”
这个有点太早了... 难道是直立人种系
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