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白垩,又名白土粉、白土子、白埴土,是一种非晶质石灰岩,泥质石灰岩没固结前个样态,呈白色,主要成分为碳酸钙,多为红藻类化石所化成。

拉地质时间表中个白垩纪,因为英国著名个白垩系地层构造为此年代个代表而得名。