Radiocarbon dating for kids
The radiocarbon dates at the site of Pedra Furada, totaling 52 in my final report (Parenti, in press) are fully confirmed by new AMS techniques, especially for the oldest unit, Pedra Furada 1, which is now dated to at least 50,000 years BP.
AR: You reported in a web interview on finding human remains (3 fossilized teeth and a skull fragment) at Garrincho from about 15,000 years old.
in northeastern Brazil represents possibly the oldest known human site in the Americas.
Since C-14 dates of 48-32,000 BP were reported in a Nature article (Guidon and Delibrias 1986), the site’s Paleoindian components have been highly controversial, challenged (though not refuted) by many North American researchers (e.g. Yet the site has solid evidence of non-Clovis, Paleoindian occupations including human remains, plus a unique rock painting tradition from at least 12,000-6,000 BP.
An M1 (molar) in a fragment of the maxilla is archaic due to its large size and the fact that it is only slightly flattened. AR: In a recent (1999) paper by Guérin et al., a 9,700 year old female skeleton (fig.3) was mentioned as being found at Toca da Janela da Barra do Antonião near Serra da Capivara Park.
Five of the samples proved to be even beyond the limit of this new technique, returning ages of greater than 56,000 BP.The strong buccal-lingual diameter of this tooth is, however, surpassed by certain fossils from the end of the Late Pleistocene in Australia, and at the beginning of the Holocene in Indonesia (Wadjak I).Its slight flattening, on the order of the present day averages of Africa and Asia, recalls that of Predmostí and the Neanderthals.The measured radiocarbon date (Beta 136204) was 12,210 /- 40 BP (Peyre et al. They are the oldest human remains we have found until now.
Presently we are waiting for dates on 5 additional burials we excavated in December, 2001 in the entrance of a limestone cave, underneath a wall with rock art.It is remarkable for its thickness – an archaic trait – and for the presence of a rare anomaly, a temporal-parietal, endo-exo cranial fossa (hole in bone through which arteries pass).The teeth, as noted, consist of one I/1 (incisor) which by its size and its compressed appearance render it archaic, and by being remarkably well worn despite its youthful age.Like the latter, the compressed appearance results in a strong buccal-lingual diameter, that has no equivalent since the end of the Late Pleistocene except with the maximum recorded in the Australian series.