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Th for young samples, although this problem becomes less significant or even insignificant with increasing age.
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The question of when the first humans arrived in the New World has been a bone of contention for several decades.
Similarly, the age of rock paintings has been heatedly debated.
Settlements in the Serra da Capivara National Park have been dated to between 5 kyr and 50 kyr, which is far older than the Clovis barrier.
Moreover, calcite formation on a rock-wall painting in a rockshelter yielded thermoluminescence (TL) and electron paramagnetic resonance (EPR) ages older than 35 kyr BP (Watanabe et al. In an attempt to contribute to this ongoing debate, we have studied calcite deposits covering prehistoric paintings from several rockshelters (Toca da Bastiana, Toca do Serrote de Moendas, and Toca da Gameleirinha [Pedra pintada]).
Coupled AMS (accelerator mass spectrometry) 14C and MC-ICPMS (multi-collector inductively coupled plasma mass spectrometry) 230Th/U dating was performed in Toca da Gameleirinha.
The ages obtained for these calcites are younger than 12 kyr and suggest that the paintings could be more recent than proposed by previous studies.
and most refined of the radiometric dating schemes.
It can be used to date rocks that formed from about 1 million years to over 4.5 billion years ago with routine precisions in the 0.1–1 percent range.
Pb) leads to multiple dating techniques within the overall U–Pb system.
The term U–Pb dating normally implies the coupled use of both decay schemes in the 'concordia diagram' (see below).
However, use of a single decay scheme (usually Pb) leads to the U–Pb isochron dating method, analogous to the rubidium-strontium dating method.