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To gain insights about the state of U-series isotopes in old samples, laser ablation ICP-MS analysis was used for the detailed mapping of U-series isotopes in a 1.2 Ma old horse tooth from the archaeological site of Fuente Nueva III (Orce, Andalusia, Spain).The maps show a complex system of U-migration in and out of the dental tissues.There are clearly domains in the dentine of the tooth where the Th/U ratios indicate continuing U-accumulation.These domains could be extracted and used for open-system U-series dating Firstly, the diffusion–adsorption model could be applied for open-system U-series dating of bones well beyond one million years.This gap is from about 40,000 ya (years ago) to about 200,000 ya on the evolutionist's time scale.This paper reviews the possible approaches for dating of human bones and teeth, older than 500,000 years.Skeletal tissues can, in principle, be dated with an open-system U-series approach, which requires that the Th/U activity ratio is still below equilibrium.

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Your access to the NCBI website at gov has been temporarily blocked due to a possible misuse/abuse situation involving your site.

The practical difficulty of this approach is whether there are actually any old samples that conform to the D-A model.

The horse tooth from Fuente Nueva III, for example, was definitely not suitable for D-A dating.

Since the time of separation of the evolutionary lines of apes and humans about 5 million years ago, some fossil specimens of the skeletal remains of our earliest ancestors have been preserved and discovered.

Putting together the pieces of the puzzle of human biological history is the task of paleontologists, geologists and anthropologists.




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