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ice age |
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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). |
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The chart, published in the February GEOLOGY, shows a drowned world of former river valleys, flood plains, and ancient lakes that would have been above sea level at the end of the last glacial epoch, more than 10,000 years ago. Summer sunlight then was not strong enough to melt the giant ice caps and end the glacial epoch. Global temperatures in the glacial epoch swung up and down radically from one millennium to the next. |
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