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It is actually the GISP2 core, only, where annual layers have been “counted,” and they were counted to only “110,000” years, near the bottom of the core.
It is very important to understand that most of these alleged annual layers are concentrated in the bottom several hundred meters of the core, and that their interpretation as “annual” is very questionable.
Glaciologists expected to see several glacial/interglacial 100,000-year cycles in the Greenland core, but the evidence points to one ice age.
(Antarctic ice cores are a different situation, as explained below.) Ross goes on to point out that glaciologists “know” that the layers are annual because of volcanic ash signatures, climatic cycles, radiometric dating of minerals embedded in the ice, and a 3.9 million year deep-sea core off New Zealand’s Southern Alps.
Oxygen isotopes in ice cores extracted from polar regions exhibit a decreasing trend in the ratio of the heavy to light isotopes from the beginning of the Ice Age to its end, at which point the trend reverses sharply and then remains fairly constant for several thousand years.