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 ?
That time span is important because it covers more than one full glacial cycle.
Bubbles within the ice preserve tiny samples of the atmosphere from times when ice covered large patches of the globe, giving scientists their first glimpse of the part the atmosphere plays in the glacial cycle.
The last glacial cycle spans the MIS5 interglacial through the MIS2 stadial (i.
However, the theory did not enjoy widespread support until 1976, when oceanographers analyzed two marine records and found that the glacial cycle closely matched changes in the shape of Earth's circular orbit, the tilt of the planet, and the way its axis wobbles.
6 feet) of a 400-meter (1,312-foot) sediment core drilled in 2005 in the North Atlantic Ocean by the Integrated Ocean Drilling Program, gives new information about the four glacial cycles that occurred during that period.
clearly state the opposite, that CO2 lags "with respect to the Antarctic temperature over glacial terminations V to VII are 800, 1600, and 2800 years, respectively, which are consistent with earlier observations during the last four glacial cycles.
The simulation proved able to correctly calculate both the observed ice-sheet of today and its evolution over previous glacial cycles, thus increasing the confidence that it can properly assess the future.
When we looked at almost the last million years of geologic activity in eastern California, we found that volcanoes tended to erupt between glacial cycles.
According to the study by Indiana University researchers, which focuses on North American rattlesnakes, rate of future change in suitable habitat will be two to three orders of magnitude greater than the average change over the past 300 millennia, a time that included three major glacial cycles and significant variation in climate and temperature.
A likely population bottleneck during Oxygen Isotope Stage 4 is not discussed, and there is little attempt to examine the responses of MSA populations to significant changes in biogeography during successive glacial cycles.
This transition marked a global climate change with the beginning of glacial periods lasting 100,000 years, in comparison to the gradual intensification of glacial cycles occurring in the three million years immediately before, when periods lasted 41,000 years.
Scientists are eager to study the oldest glacial cycles because previous cores drilled at Vostok and in Greenland record only the two most recent ice ages.