<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">Quaternary</topic></authority><related type="narrower"><topic>Pleistocene</topic></related><related type="narrower"><topic>Holocene</topic></related><related type="other"><topic>Tertiary</topic></related><related type="broader"><topic>Cenozoic</topic></related><variant type="other"><topic>Quaternary period</topic></variant> <note xml:lang="en"><![CDATA[ The Quaternary is the second major division of geologic time in the Cenozoic era, following the Tertiary period. It extends from about 1.8 million years ago to the present. It is divided into Pleistocene and Holocene epochs. ]]></note></mads>