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Quaternary period
The second period of the Cenozoic era containing the Pleistocene epoch and the Holocene epoch and dating from 1.8 million years to the present. (NOAA Paleoclimate Glossary)
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Any of four equal-sized sets of observations in a ranked sample.
One-fourth of the udder of an animal.
A unit of mass equal to 1/4 kilogram, or 250 grams.
One of four equal parts; a quantity corresponding to one fourth of the whole.
