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A continuous count of layers exists back as far as 160,000 years. In addition to yearly layering, individual strong events (such as large-scale volcanic eruptions) can be observed and correlated between ice cores. A number of historical eruptions as far back as Vesuvius nearly 2,000 years ago serve as benchmarks with which to determine the accuracy of the yearly layers as far down as around 500 meters. As one goes further down in the ice core, the ice becomes more compacted than near the surface, and individual yearly layers are slightly more difficult to observe. For this reason, there is some uncertainty as one goes back towards 100,000 years. Ages of 40,000 years or less are estimated to be off by 2% at most. Ages of 60,000 years may be off by up to 10%, and the uncertainty rises to 20% for ages of 110,000 years based on direct counting of layers (D. Meese et al., J. Geophys. Res. 102, 26,411, 1997). Recently, absolute ages have been determined to 75,000 years for at least one location using cosmogenic radionuclides chlorine-36 and beryllium-10 (G. Wagner et al., Earth Planet. Sci. Lett. 193, 515, 2001). These agree with the ice flow models and the yearly layer counts. Note that there is no indication anywhere that these ice caps were ever covered by a large body of water, as some people with young-Earth views would expect.

This is among the children toys that are on every children wish list this season. After so many searches and choices, only a handful remains. They also point out that the majority of toxic childrens toys originate in China, the very source of borrowed money for recent government financial bailouts.