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白堊紀者(符:K),地質年代也。中生代之末,始於億四千五百五十萬年前,迄六千五百五十萬年前,凡八千萬年。因其地層富蜃灰(白堊),故名。
白堊紀者,居侏羅紀之後,而古近紀次之。
紀末,各地火山暴發(有云隕星墜地),大氣微粒突增,日光遂減,植物不復生,動物無食而衰矣,百昌近半幾絕,生靈塗炭,此謂白堊紀末滅絕也。
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