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

[′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)
References in periodicals archive ?
2011, Variations of the Earth principal moments of inertia due to glacial cycles for the last 800Ka.
The southern Washington and Oregon Cascades and coastal regions of the PNW may have provided areas of suitable habitat during the last glacial cycles of the Pleistocene in the lowlands.
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.
These results will not alter scientist's prevailing belief that variations in Earth's orbit set the pace of the present glacial cycle.
For this reason, sand can travel only as far as the next bay in a single glacial cycle.
The glacial cycle is the biggest climat e change on Earth in the time that we human beings have been here.
Along these lines, numerous phylogeographic studies indicate that the genetic differentiation of many bird species was affected by Pleistocene glacial cycles (Hewitt 1996, 1999).
If in the Anthropocene humans have become a force of nature, changing the functioning of the Earth system as volcanism and glacial cycles do, then it means the end of the idea of nature as no more than the inert backdrop to the drama of human affairs.
Led by University of Las Vegas geoscientist Matthew Lachniet, the researchers showed that climate change in the Great Basin (and Nevada) matches the timing of orbitally-derived periods of glacial cycles, in line with the theory forwarded by Serbian scientist Milutin Milankovitch more than 100 years ago.
The temperature at the base of the ice, and therefore the current dynamics of the Greenland ice sheet is the result of the interaction between the heat flow from the earth's interior and the temperature changes associated with glacial cycles," explains corresponding author Irina Rogozhina (GFZ) who initiated IceGeoHeat.
Sea-level fluctuations coincident with glacial cycles were common throughout the Pliocene and Pleistocene (Vail and Hardenbol 1979; Scott and Upchurch 1982; Riggs 1983), and when projected on the present landscape (Cooke 1945; Winker and Howard 1977a,b), suggest repeated fragmentation and isolation of vertebrate populations occupying the
For example, we can see major oxygen-isotope cycles (reflecting global ice volume) spaced at about 2-meter intervals between 80 and 90 meters in the figure below; we know from work here and elsewhere that these reflect glacial cycles controlled by changes in the obliquity of Earth's rotational axis that occur with a regular period of 41,000 years.