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ice age |
Also found in: Wikipedia, Hutchinson | 0.01 sec. |
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Ice Age: see Pleistocene epoch Pleistocene epoch (plī`stəsēn), 6th epoch of the Cenozoic era of geologic time (see Geologic Timescale , table). ..... Click the link for more information. . ice ageor glacial ageAny geologic period during which thick ice sheets cover vast areas of land. Such periods of large-scale glaciation may last several million years and drastically reshape surface features of entire continents. A number of major ice ages have occurred throughout the Earth's history; the most recent periods were during the Pleistocene Epoch (1.8 million–10,000 years ago). ice age [′īs ‚āj] (geology) A major interval of geologic time during which extensive ice sheets (continental glaciers) formed over many parts of the world. Ice Age [′īs ‚āj] (geology) How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Then, just before the time of the ice-age diamictites, the relative amount of carbon13 dropped sharply. Their analysis of ancient ice from Greenland and Antarctica raises questions about what drove the ice-age temperature changes and whether similar factors are operating today. By reducing the ice-age variations to a series of frequencies, the scientists found that the dominant 100,000-year cycle was surprisingly exact. |
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