Ice Age

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Ice Age:

see Pleistocene epochPleistocene epoch
, 6th epoch of the Cenozoic era of geologic time (see Geologic Timescale, table). According to a classification that considered its deposits to have been formed by the biblical great flood, the epoch was originally called the Quaternary.
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Ice Age


a relatively long stage in the geological history of the earth during which, against the background of a general relative cooling of the climate, there was repeated alternation of very cold intervals of time (glacials), when extensive continental glaciation occurred, and intervals of time with a warmer climate (interglacials), when a significant part of the continental ice melted. Ice ages have been established in the Lower Proterozoic in North America; in the Upper Riphean in Africa and Australia; in the Wend in Europe, Asia, and North America; in the Ordovician of Africa; and at the end of the Carboniferous and the beginning of the Permian on the continent of Gondwana. The ice age of the Pleistocene has been studied most.

ice age

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A major interval of geologic time during which extensive ice sheets (continental glaciers) formed over many parts of the world.

Ice Age

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References in periodicals archive ?
These are long periods of time during which the climate varies between colder glacial periods--when sheets of ice cover large parts of Earth's surface--and warmer interglacial periods.
An interglacial period lasts between 40,000 to 100,000 years.
Here, fossilised giant clams, which lived during a 40 000-year-long interglacial period known as Marine Isotope Stage 11 (MIS 11), can be found in ancient reef beds uplifted by geological processes to some 1200 metres above sea level.
About 117,000 years ago, Earth was nearing the end of the Eemian interglacial period - the second-to-latest interglacial era of the Ice Age.
The lake's peak extent came in the last interglacial period - a warm interval before the beginning of the last ice age.
The IPCC and the climatology community in general should devote far more effort to determining the optimal range of carbon dioxide concentrations that will stabilize the climate and extend the current interglacial period over the next 50,000 years, if not indefinitely.
Then, after about 1,000 years, the climate suddenly returned to the warm, interglacial period that continues today.
The abundant corals have taken an easy road to living a rich and dominating life during the present interglacial period, but the payback comes when the climate becomes less hospitable.
is that [Australia is] much dryer during this interglacial period than during the last interglacial period," says Gregory Webb, a geologist at the Queensland University of Technology in Brisbane.
One sees clear indications of long-term changes discussed above, with CO2 and proxy temperature changes associated with the last ice age and its transition into our present interglacial period of warmth.
After all, any geologist will tell you we are nearing the middle of an interglacial period when temperature would be rising naturally.
Comments in the Foreword, and later by Wymer & Singer, say that it is 'now apparent' that the Hoxnian interglacial is not the penultimate interglacial period, but this has been well recognized in the light of European stratigraphic sequences for over 20 years.