quote:
Prediction 32. As far as I understand, Radiocarbon dating cannot be used on material older than about 45,000 years. 70,000 years is outside the range of the C14 method due to its relatively short half-life.
--Not necessarily, you can measure much further back than 45k and even further than 70k. However, the issue is that with increasing age the method becomes increasingly inaccurate as an inherent protential. With age, the sample is more prone to contamination and as the total quantity of parent isotope diminishes it becomes increasingly more probable that contamination has taken place. Of course that is only half of the nutshell explanation.