external frameThis data help in obtaining and objective interpretation of dates. There are a number of technical difficulties inherent in this method of dating. 1. The first difficulty is that the quantity required for a single determination is comparatively large. It will be difficult to obtain sufficient quantities of samples, especially in the case of valuable museum specimens. 2. The second difficulty is that the radio active decay does not take place at a uniform rate but is a random process, and is therefore, governed by the laws of statistical probability. 3. The third and most important difficulty is that, the initial ratio of C-14 to C-12 is very small and difficult to measure with precision. 4. Another difficulty that has to be taken into serious consideration is the possibility of uneven distribution of radio carbon in organic matter. 5. If the specimen is analyzed after having been exposed to contamination by carbon compounds of an age younger than its own, radio carbon age is liable to be reduced.
Whoever shaped the stone tools excavated near Misliya-1 would have used a sophisticated method called the Levallois technique. This suggests the emergence of this advanced method of stone-tool creation was linked to the appearance of modern humans in this region, as was previously seen in Africa. These findings altogether suggest that modern humans migrated out of Africa at least 50,000 years sooner than researchers concluded from previous fossil evidence. Quam told Live Science. Features of this new fossil look more like those seen in current humans than in fossils of similar age from the Ethiopian sites of Omo and Herto, the researchers said. The fact that such modern features evolved earlier than previously thought “suggests that our biological history needs to be pushed back to a much earlier period — not 200,000, but probably 500,000 years,”Hershkovitz told Live Science. The fact that modern humans may have left Africa earlier than previously thought might also help explain puzzling discoveries, such as “the presence of modern humans in China at 120,000 years,” Hershkovitz said. These new findings also shed light on which routes modern humans might have taken on their exodus from Africa. It is possible, 18.104.22.168/Nepal_Matrimonial_Nepali_Matrimonials_Nepal_Dating_Marriage_Proposals_From_Nepalese_Online though not likely, that those fossils hold retrievable DNA, Quam said.
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