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The Quaternary glaciation describes a geological time in Earth history, also known in popular terminology as the Ice Age, or Pleistocene glaciation, is a series of glacial events separated by interglacial events during the Quaternary period that began 2.58 Ma (million years ago), and is ongoing.
It is one of five major glacial periods or "ice ages" in Earth's history since about 2.5 billion years ago; the preceding one, known as the Karoo Ice Age, lasted from about 360 to 260 Ma (Carboniferous to Mid-Permian). Outside of these ice ages, the Earth seems to have been completely ice-free, even at high latitudes.
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